From 9b96dcd3772921c9f1ea636426d7826c8119c148 Mon Sep 17 00:00:00 2001
From: Stainless Bot <107565488+stainless-bot@users.noreply.github.com>
Date: Sun, 13 Aug 2023 18:15:07 -0400
Subject: [PATCH 1/4] feat: allow a default timeout to be set for clients
 (#117)

---
 src/anthropic/_base_client.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/anthropic/_base_client.py b/src/anthropic/_base_client.py
index 6e7ae440..e092ca52 100644
--- a/src/anthropic/_base_client.py
+++ b/src/anthropic/_base_client.py
@@ -82,7 +82,8 @@
 _AsyncStreamT = TypeVar("_AsyncStreamT", bound=AsyncStream[Any])
 
 
-DEFAULT_TIMEOUT = Timeout(timeout=60.0, connect=5.0)
+# default timeout is 10 minutes
+DEFAULT_TIMEOUT = Timeout(timeout=600.0, connect=5.0)
 DEFAULT_MAX_RETRIES = 2
 DEFAULT_LIMITS = Limits(max_connections=100, max_keepalive_connections=20)
 

From aa3120074a04a610045452df481bdd81bbed8c19 Mon Sep 17 00:00:00 2001
From: Stainless Bot <107565488+stainless-bot@users.noreply.github.com>
Date: Mon, 14 Aug 2023 15:18:16 -0400
Subject: [PATCH 2/4] chore: assign default reviewers to release PRs (#119)

---
 release-please-config.json | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/release-please-config.json b/release-please-config.json
index 02ee5e14..25f5db1a 100644
--- a/release-please-config.json
+++ b/release-please-config.json
@@ -56,6 +56,9 @@
       "hidden": true
     }
   ],
+  "reviewers": [
+    "RobertCraigie"
+  ],
   "release-type": "python",
   "extra-files": [
     "src/anthropic/_version.py"

From 5573871dd836205508665a8353bc239b32ac95c4 Mon Sep 17 00:00:00 2001
From: Stainless Bot <107565488+stainless-bot@users.noreply.github.com>
Date: Tue, 15 Aug 2023 11:15:41 -0400
Subject: [PATCH 3/4] chore(internal): minor formatting change (#120)

---
 pyproject.toml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pyproject.toml b/pyproject.toml
index 2a1975c0..49d7fe47 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ anyio = ">= 3.5.0, < 4"
 distro = ">= 1.7.0, < 2"
 tokenizers = ">= 0.13.0"
 
+
 [tool.poetry.group.dev.dependencies]
 pyright = "1.1.318"
 mypy = "1.4.1"

From 8fd0131b64fd58b25b3d2ee47cd01cbfd7c577b0 Mon Sep 17 00:00:00 2001
From: Stainless Bot <107565488+stainless-bot@users.noreply.github.com>
Date: Wed, 16 Aug 2023 15:49:54 +0100
Subject: [PATCH 4/4] feat: add support for Pydantic v2 (#121)

---
 noxfile.py                         |  12 ++
 poetry.lock                        | 324 +++++++++++++++++++++++++----
 pyproject.toml                     |   7 +-
 src/anthropic/_base_client.py      |   3 +-
 src/anthropic/_compat.py           | 152 ++++++++++++++
 src/anthropic/_models.py           | 179 +++++++++++-----
 src/anthropic/_types.py            |   2 +
 src/anthropic/_utils/_transform.py |   3 +-
 src/anthropic/_utils/_utils.py     |   9 +-
 tests/test_models.py               |  46 +++-
 tests/utils.py                     |  35 +++-
 11 files changed, 647 insertions(+), 125 deletions(-)
 create mode 100644 noxfile.py
 create mode 100644 src/anthropic/_compat.py

diff --git a/noxfile.py b/noxfile.py
new file mode 100644
index 00000000..bac3c5c8
--- /dev/null
+++ b/noxfile.py
@@ -0,0 +1,12 @@
+import nox
+import nox_poetry
+
+
+@nox_poetry.session(reuse_venv=True, name="test-pydantic-v1")
+def test_pydantic_v1(session: nox.Session) -> None:
+    session.run_always("poetry", "install", external=True)
+
+    # https://github.com/cjolowicz/nox-poetry/issues/1116
+    session._session.run("python", "-m", "pip", "install", "pydantic<2", external=True)  # type: ignore
+
+    session.run("pytest", "--showlocals", "--ignore=tests/functional")
diff --git a/poetry.lock b/poetry.lock
index 75fbae78..376745ad 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,5 +1,20 @@
 # This file is automatically @generated by Poetry and should not be changed by hand.
 
+[[package]]
+name = "annotated-types"
+version = "0.5.0"
+description = "Reusable constraint types to use with typing.Annotated"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "annotated_types-0.5.0-py3-none-any.whl", hash = "sha256:58da39888f92c276ad970249761ebea80ba544b77acddaa1a4d6cf78287d45fd"},
+    {file = "annotated_types-0.5.0.tar.gz", hash = "sha256:47cdc3490d9ac1506ce92c7aaa76c579dc3509ff11e098fc867e5130ab7be802"},
+]
+
+[package.dependencies]
+typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.9\""}
+
 [[package]]
 name = "anyio"
 version = "3.6.2"
@@ -22,6 +37,24 @@ doc = ["packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphinx-rtd-theme"]
 test = ["contextlib2", "coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "mock (>=4)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (<0.15)", "uvloop (>=0.15)"]
 trio = ["trio (>=0.16,<0.22)"]
 
+[[package]]
+name = "argcomplete"
+version = "3.1.1"
+description = "Bash tab completion for argparse"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "argcomplete-3.1.1-py3-none-any.whl", hash = "sha256:35fa893a88deea85ea7b20d241100e64516d6af6d7b0ae2bed1d263d26f70948"},
+    {file = "argcomplete-3.1.1.tar.gz", hash = "sha256:6c4c563f14f01440aaffa3eae13441c5db2357b5eec639abe7c0b15334627dff"},
+]
+
+[package.dependencies]
+importlib-metadata = {version = ">=0.23,<7", markers = "python_version < \"3.8\""}
+
+[package.extras]
+test = ["coverage", "mypy", "pexpect", "ruff", "wheel"]
+
 [[package]]
 name = "atomicwrites"
 version = "1.4.1"
@@ -104,14 +137,14 @@ uvloop = ["uvloop (>=0.15.2)"]
 
 [[package]]
 name = "certifi"
-version = "2023.5.7"
+version = "2023.7.22"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
 python-versions = ">=3.6"
 files = [
-    {file = "certifi-2023.5.7-py3-none-any.whl", hash = "sha256:c6c2e98f5c7869efca1f8916fed228dd91539f9f1b444c314c06eef02980c716"},
-    {file = "certifi-2023.5.7.tar.gz", hash = "sha256:0f0d56dc5a6ad56fd4ba36484d6cc34451e1c6548c61daad8c320169f91eddc7"},
+    {file = "certifi-2023.7.22-py3-none-any.whl", hash = "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"},
+    {file = "certifi-2023.7.22.tar.gz", hash = "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082"},
 ]
 
 [[package]]
@@ -142,6 +175,36 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "colorlog"
+version = "6.7.0"
+description = "Add colours to the output of Python's logging module."
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "colorlog-6.7.0-py2.py3-none-any.whl", hash = "sha256:0d33ca236784a1ba3ff9c532d4964126d8a2c44f1f0cb1d2b0728196f512f662"},
+    {file = "colorlog-6.7.0.tar.gz", hash = "sha256:bd94bd21c1e13fac7bd3153f4bc3a7dc0eb0974b8bc2fdf1a989e474f6e582e5"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+
+[package.extras]
+development = ["black", "flake8", "mypy", "pytest", "types-colorama"]
+
+[[package]]
+name = "distlib"
+version = "0.3.7"
+description = "Distribution utilities"
+category = "dev"
+optional = false
+python-versions = "*"
+files = [
+    {file = "distlib-0.3.7-py2.py3-none-any.whl", hash = "sha256:2e24928bc811348f0feb63014e97aaae3037f2cf48712d51ae61df7fd6075057"},
+    {file = "distlib-0.3.7.tar.gz", hash = "sha256:9dafe54b34a028eafd95039d5e5d4851a13734540f1331060d31c9916e7147a8"},
+]
+
 [[package]]
 name = "distro"
 version = "1.8.0"
@@ -154,6 +217,22 @@ files = [
     {file = "distro-1.8.0.tar.gz", hash = "sha256:02e111d1dc6a50abb8eed6bf31c3e48ed8b0830d1ea2a1b78c61765c2513fdd8"},
 ]
 
+[[package]]
+name = "filelock"
+version = "3.12.2"
+description = "A platform independent file lock."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "filelock-3.12.2-py3-none-any.whl", hash = "sha256:cbb791cdea2a72f23da6ac5b5269ab0a0d161e9ef0100e653b69049a7706d1ec"},
+    {file = "filelock-3.12.2.tar.gz", hash = "sha256:002740518d8aa59a26b0c76e10fb8c6e15eae825d34b6fdf670333fd7b938d81"},
+]
+
+[package.extras]
+docs = ["furo (>=2023.5.20)", "sphinx (>=7.0.1)", "sphinx-autodoc-typehints (>=1.23,!=1.23.4)"]
+testing = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "diff-cover (>=7.5)", "pytest (>=7.3.1)", "pytest-cov (>=4.1)", "pytest-mock (>=3.10)", "pytest-timeout (>=2.1)"]
+
 [[package]]
 name = "h11"
 version = "0.12.0"
@@ -350,6 +429,46 @@ files = [
 [package.dependencies]
 setuptools = "*"
 
+[[package]]
+name = "nox"
+version = "2023.4.22"
+description = "Flexible test automation."
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "nox-2023.4.22-py3-none-any.whl", hash = "sha256:0b1adc619c58ab4fa57d6ab2e7823fe47a32e70202f287d78474adcc7bda1891"},
+    {file = "nox-2023.4.22.tar.gz", hash = "sha256:46c0560b0dc609d7d967dc99e22cb463d3c4caf54a5fda735d6c11b5177e3a9f"},
+]
+
+[package.dependencies]
+argcomplete = ">=1.9.4,<4.0"
+colorlog = ">=2.6.1,<7.0.0"
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
+packaging = ">=20.9"
+typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
+virtualenv = ">=14"
+
+[package.extras]
+tox-to-nox = ["jinja2", "tox (<4)"]
+
+[[package]]
+name = "nox-poetry"
+version = "1.0.3"
+description = "nox-poetry"
+category = "dev"
+optional = false
+python-versions = ">=3.7,<4.0"
+files = [
+    {file = "nox_poetry-1.0.3-py3-none-any.whl", hash = "sha256:a2fffeb70ae81840479e68287afe1c772bf376f70f1e92f99832a20b3c64d064"},
+    {file = "nox_poetry-1.0.3.tar.gz", hash = "sha256:dc7ecbbd812a333a0c0b558f57e5b37f7c12926cddbcecaf2264957fd373824e"},
+]
+
+[package.dependencies]
+nox = ">=2020.8.22"
+packaging = ">=20.9"
+tomlkit = ">=0.7"
+
 [[package]]
 name = "packaging"
 version = "23.1"
@@ -423,56 +542,137 @@ files = [
 
 [[package]]
 name = "pydantic"
-version = "1.10.2"
-description = "Data validation and settings management using python type hints"
+version = "2.1.1"
+description = "Data validation using Python type hints"
 category = "main"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "pydantic-1.10.2-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:bb6ad4489af1bac6955d38ebcb95079a836af31e4c4f74aba1ca05bb9f6027bd"},
-    {file = "pydantic-1.10.2-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:a1f5a63a6dfe19d719b1b6e6106561869d2efaca6167f84f5ab9347887d78b98"},
-    {file = "pydantic-1.10.2-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:352aedb1d71b8b0736c6d56ad2bd34c6982720644b0624462059ab29bd6e5912"},
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-    {file = "pydantic-1.10.2.tar.gz", hash = "sha256:91b8e218852ef6007c2b98cd861601c6a09f1aa32bbbb74fab5b1c33d4a1e410"},
+    {file = "pydantic-2.1.1-py3-none-any.whl", hash = "sha256:43bdbf359d6304c57afda15c2b95797295b702948082d4c23851ce752f21da70"},
+    {file = "pydantic-2.1.1.tar.gz", hash = "sha256:22d63db5ce4831afd16e7c58b3192d3faf8f79154980d9397d9867254310ba4b"},
 ]
 
 [package.dependencies]
-typing-extensions = ">=4.1.0"
+annotated-types = ">=0.4.0"
+pydantic-core = "2.4.0"
+typing-extensions = ">=4.6.1"
 
 [package.extras]
-dotenv = ["python-dotenv (>=0.10.4)"]
-email = ["email-validator (>=1.0.3)"]
+email = ["email-validator (>=2.0.0)"]
+
+[[package]]
+name = "pydantic-core"
+version = "2.4.0"
+description = ""
+category = "main"
+optional = false
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+    {file = "pydantic_core-2.4.0-pp38-pypy38_pp73-win_amd64.whl", hash = "sha256:dd2429f7635ad4857b5881503f9c310be7761dc681c467a9d27787b674d1250a"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-macosx_10_7_x86_64.whl", hash = "sha256:efff8b6761a1f6e45cebd1b7a6406eb2723d2d5710ff0d1b624fe11313693989"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:32a1e0352558cd7ccc014ffe818c7d87b15ec6145875e2cc5fa4bb7351a1033d"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:a027f41c5008571314861744d83aff75a34cf3a07022e0be32b214a5bc93f7f1"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:1927f0e15d190f11f0b8344373731e28fd774c6d676d8a6cfadc95c77214a48b"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-musllinux_1_1_aarch64.whl", hash = "sha256:7aa82d483d5fb867d4fb10a138ffd57b0f1644e99f2f4f336e48790ada9ada5e"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-musllinux_1_1_x86_64.whl", hash = "sha256:b85778308bf945e9b33ac604e6793df9b07933108d20bdf53811bc7c2798a4af"},
+    {file = "pydantic_core-2.4.0-pp39-pypy39_pp73-win_amd64.whl", hash = "sha256:3ded19dcaefe2f6706d81e0db787b59095f4ad0fbadce1edffdf092294c8a23f"},
+    {file = "pydantic_core-2.4.0.tar.gz", hash = "sha256:ec3473c9789cc00c7260d840c3db2c16dbfc816ca70ec87a00cddfa3e1a1cdd5"},
+]
+
+[package.dependencies]
+typing-extensions = ">=4.6.0,<4.7.0 || >4.7.0"
 
 [[package]]
 name = "pyright"
@@ -789,6 +989,18 @@ files = [
     {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
 ]
 
+[[package]]
+name = "tomlkit"
+version = "0.12.1"
+description = "Style preserving TOML library"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tomlkit-0.12.1-py3-none-any.whl", hash = "sha256:712cbd236609acc6a3e2e97253dfc52d4c2082982a88f61b640ecf0817eab899"},
+    {file = "tomlkit-0.12.1.tar.gz", hash = "sha256:38e1ff8edb991273ec9f6181244a6a391ac30e9f5098e7535640ea6be97a7c86"},
+]
+
 [[package]]
 name = "typed-ast"
 version = "1.5.4"
@@ -835,6 +1047,28 @@ files = [
     {file = "typing_extensions-4.7.1.tar.gz", hash = "sha256:b75ddc264f0ba5615db7ba217daeb99701ad295353c45f9e95963337ceeeffb2"},
 ]
 
+[[package]]
+name = "virtualenv"
+version = "20.21.1"
+description = "Virtual Python Environment builder"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "virtualenv-20.21.1-py3-none-any.whl", hash = "sha256:09ddbe1af0c8ed2bb4d6ed226b9e6415718ad18aef9fa0ba023d96b7a8356049"},
+    {file = "virtualenv-20.21.1.tar.gz", hash = "sha256:4c104ccde994f8b108163cf9ba58f3d11511d9403de87fb9b4f52bf33dbc8668"},
+]
+
+[package.dependencies]
+distlib = ">=0.3.6,<1"
+filelock = ">=3.4.1,<4"
+importlib-metadata = {version = ">=4.8.3", markers = "python_version < \"3.8\""}
+platformdirs = ">=2.4,<4"
+
+[package.extras]
+docs = ["furo (>=2023.3.27)", "proselint (>=0.13)", "sphinx (>=6.1.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=22.12)"]
+test = ["covdefaults (>=2.3)", "coverage (>=7.2.3)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.3.1)", "pytest-env (>=0.8.1)", "pytest-freezegun (>=0.4.2)", "pytest-mock (>=3.10)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)"]
+
 [[package]]
 name = "zipp"
 version = "3.10.0"
@@ -854,4 +1088,4 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7"
-content-hash = "922d814fb2679098d6e0ccab5857e838cf0207b8ec5d058ea3a068c4707e58da"
+content-hash = "0bff26949175c9e1b574115a70e16186a554b03445470c966295a1e05d36ff9a"
diff --git a/pyproject.toml b/pyproject.toml
index 49d7fe47..3c6f2789 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ packages = [
 [tool.poetry.dependencies]
 python = "^3.7"
 httpx = ">= 0.23.0, < 1"
-pydantic = "^1.9.0"
+pydantic = ">= 1.9.0, < 3"
 typing-extensions = ">= 4.5, < 5"
 anyio = ">= 3.5.0, < 4"
 distro = ">= 1.7.0, < 2"
@@ -30,6 +30,8 @@ pytest-asyncio = "0.21.1"
 ruff = "0.0.282"
 isort = "5.10.1"
 time-machine = "^2.9.0"
+nox = "^2023.4.22"
+nox-poetry = "^1.0.3"
 
 
 [build-system]
@@ -60,7 +62,8 @@ pythonVersion = "3.7"
 
 exclude = [
     "_dev",
-    ".venv"
+    ".venv",
+    ".nox",
 ]
 reportImportCycles = false
 reportPrivateUsage = false
diff --git a/src/anthropic/_base_client.py b/src/anthropic/_base_client.py
index e092ca52..418a4fd3 100644
--- a/src/anthropic/_base_client.py
+++ b/src/anthropic/_base_client.py
@@ -55,6 +55,7 @@
     ModelBuilderProtocol,
 )
 from ._utils import is_dict, is_mapping
+from ._compat import model_copy
 from ._models import (
     BaseModel,
     GenericModel,
@@ -151,7 +152,7 @@ def _params_from_url(self, url: URL) -> httpx.QueryParams:
         return httpx.QueryParams(cast(Any, self._options.params)).merge(url.params)
 
     def _info_to_options(self, info: PageInfo) -> FinalRequestOptions:
-        options = self._options.copy()
+        options = model_copy(self._options)
 
         if not isinstance(info.params, NotGiven):
             options.params = {**options.params, **info.params}
diff --git a/src/anthropic/_compat.py b/src/anthropic/_compat.py
new file mode 100644
index 00000000..7b5f798f
--- /dev/null
+++ b/src/anthropic/_compat.py
@@ -0,0 +1,152 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any, Union, TypeVar, cast
+from datetime import date, datetime
+
+import pydantic
+from pydantic.fields import FieldInfo
+
+from ._types import StrBytesIntFloat
+
+_ModelT = TypeVar("_ModelT", bound=pydantic.BaseModel)
+
+# --------------- Pydantic v2 compatibility ---------------
+
+# Pyright incorrectly reports some of our functions as overriding a method when they don't
+# pyright: reportIncompatibleMethodOverride=false
+
+PYDANTIC_V2 = pydantic.VERSION.startswith("2.")
+
+# v1 re-exports
+if TYPE_CHECKING:
+
+    def parse_date(value: date | StrBytesIntFloat) -> date:
+        ...
+
+    def parse_datetime(value: Union[datetime, StrBytesIntFloat]) -> datetime:
+        ...
+
+    def get_args(t: type[Any]) -> tuple[Any, ...]:
+        ...
+
+    def is_union(tp: type[Any] | None) -> bool:
+        ...
+
+    def get_origin(t: type[Any]) -> type[Any] | None:
+        ...
+
+    def is_literal_type(type_: type[Any]) -> bool:
+        ...
+
+    def is_typeddict(type_: type[Any]) -> bool:
+        ...
+
+else:
+    if PYDANTIC_V2:
+        from pydantic.v1.typing import get_args as get_args
+        from pydantic.v1.typing import is_union as is_union
+        from pydantic.v1.typing import get_origin as get_origin
+        from pydantic.v1.typing import is_typeddict as is_typeddict
+        from pydantic.v1.typing import is_literal_type as is_literal_type
+        from pydantic.v1.datetime_parse import parse_date as parse_date
+        from pydantic.v1.datetime_parse import parse_datetime as parse_datetime
+    else:
+        from pydantic.typing import get_args as get_args
+        from pydantic.typing import is_union as is_union
+        from pydantic.typing import get_origin as get_origin
+        from pydantic.typing import is_typeddict as is_typeddict
+        from pydantic.typing import is_literal_type as is_literal_type
+        from pydantic.datetime_parse import parse_date as parse_date
+        from pydantic.datetime_parse import parse_datetime as parse_datetime
+
+
+# refactored config
+if TYPE_CHECKING:
+    from pydantic import ConfigDict as ConfigDict
+else:
+    if PYDANTIC_V2:
+        from pydantic import ConfigDict
+    else:
+        # TODO: provide an error message here?
+        ConfigDict = None
+
+
+# renamed methods / properties
+def parse_obj(model: type[_ModelT], value: object) -> _ModelT:
+    if PYDANTIC_V2:
+        return model.model_validate(value)
+    else:
+        return cast(_ModelT, model.parse_obj(value))  # pyright: ignore[reportDeprecated, reportUnnecessaryCast]
+
+
+def field_is_required(field: FieldInfo) -> bool:
+    if PYDANTIC_V2:
+        return field.is_required()
+    return field.required  # type: ignore
+
+
+def field_get_default(field: FieldInfo) -> Any:
+    value = field.get_default()
+    if PYDANTIC_V2:
+        from pydantic_core import PydanticUndefined
+
+        if value == PydanticUndefined:
+            return None
+        return value
+    return value
+
+
+def field_outer_type(field: FieldInfo) -> Any:
+    if PYDANTIC_V2:
+        return field.annotation
+    return field.outer_type_  # type: ignore
+
+
+def get_model_config(model: type[pydantic.BaseModel]) -> Any:
+    if PYDANTIC_V2:
+        return model.model_config
+    return model.__config__  # type: ignore
+
+
+def get_model_fields(model: type[pydantic.BaseModel]) -> dict[str, FieldInfo]:
+    if PYDANTIC_V2:
+        return model.model_fields
+    return model.__fields__  # type: ignore
+
+
+def model_copy(model: _ModelT) -> _ModelT:
+    if PYDANTIC_V2:
+        return model.model_copy()
+    return model.copy()  # type: ignore
+
+
+def model_json(model: pydantic.BaseModel) -> str:
+    if PYDANTIC_V2:
+        return model.model_dump_json()
+    return model.json()  # type: ignore
+
+
+def model_dump(model: pydantic.BaseModel) -> dict[str, Any]:
+    if PYDANTIC_V2:
+        return model.model_dump()
+    return cast("dict[str, Any]", model.dict())  # pyright: ignore[reportDeprecated, reportUnnecessaryCast]
+
+
+# generic models
+if TYPE_CHECKING:
+
+    class GenericModel(pydantic.BaseModel):
+        ...
+
+else:
+    if PYDANTIC_V2:
+        # there no longer needs to be a distinction in v2 but
+        # we still have to create our own subclass to avoid
+        # inconsistent MRO ordering errors
+        class GenericModel(pydantic.BaseModel):
+            ...
+
+    else:
+
+        class GenericModel(pydantic.generics.GenericModel, pydantic.BaseModel):
+            ...
diff --git a/src/anthropic/_models.py b/src/anthropic/_models.py
index faab75dd..164987a7 100644
--- a/src/anthropic/_models.py
+++ b/src/anthropic/_models.py
@@ -1,16 +1,14 @@
 from __future__ import annotations
 
 import inspect
-from typing import Any, Type, Union, Generic, TypeVar, cast
+from typing import TYPE_CHECKING, Any, Type, Union, Generic, TypeVar, cast
 from datetime import date, datetime
-from typing_extensions import final
+from typing_extensions import ClassVar, Protocol, final, runtime_checkable
 
 import pydantic
 import pydantic.generics
 from pydantic import Extra
-from pydantic.fields import ModelField
-from pydantic.typing import get_args, is_union, get_origin, is_literal_type
-from pydantic.datetime_parse import parse_date
+from pydantic.fields import FieldInfo
 
 from ._types import (
     Body,
@@ -22,19 +20,41 @@
     AnyMapping,
     RequestFiles,
 )
-from ._utils import is_list, is_mapping, parse_datetime, strip_not_given
+from ._utils import is_list, is_mapping, parse_date, parse_datetime, strip_not_given
+from ._compat import PYDANTIC_V2, ConfigDict
+from ._compat import GenericModel as BaseGenericModel
+from ._compat import (
+    get_args,
+    is_union,
+    parse_obj,
+    get_origin,
+    is_literal_type,
+    get_model_config,
+    get_model_fields,
+    field_get_default,
+)
 
 __all__ = ["BaseModel", "GenericModel"]
 
 _T = TypeVar("_T")
 
 
+@runtime_checkable
+class _ConfigProtocol(Protocol):
+    allow_population_by_field_name: bool
+
+
 class BaseModel(pydantic.BaseModel):
-    class Config(pydantic.BaseConfig):
-        extra: Extra = Extra.allow
+    if PYDANTIC_V2:
+        model_config: ClassVar[ConfigDict] = ConfigDict(extra="allow")
+    else:
+
+        class Config(pydantic.BaseConfig):  # pyright: ignore[reportDeprecated]
+            extra: Any = Extra.allow  # type: ignore
 
     def __str__(self) -> str:
-        return f'{self.__repr_name__()}({self.__repr_str__(", ")})'
+        # mypy complains about an invalid self arg
+        return f'{self.__repr_name__()}({self.__repr_str__(", ")})'  # type: ignore[misc]
 
     # Override the 'construct' method in a way that supports recursive parsing without validation.
     # Based on https://github.com/samuelcolvin/pydantic/issues/1168#issuecomment-817742836.
@@ -47,36 +67,70 @@ def construct(
         m = cls.__new__(cls)
         fields_values: dict[str, object] = {}
 
-        config = cls.__config__
+        config = get_model_config(cls)
+        populate_by_name = (
+            config.allow_population_by_field_name
+            if isinstance(config, _ConfigProtocol)
+            else config.get("populate_by_name")
+        )
 
-        for name, field in cls.__fields__.items():
+        model_fields = get_model_fields(cls)
+        for name, field in model_fields.items():
             key = field.alias
-            if key not in values and config.allow_population_by_field_name:
+            if key is None or (key not in values and populate_by_name):
                 key = name
 
             if key in values:
-                value = values[key]
-                fields_values[name] = _construct_field(value=value, field=field)
-            elif not field.required:
-                fields_values[name] = field.get_default()
+                fields_values[name] = _construct_field(value=values[key], field=field, key=key)
+            else:
+                fields_values[name] = field_get_default(field)
 
+        _extra = {}
         for key, value in values.items():
-            if key not in cls.__fields__:
-                fields_values[key] = value
+            if key not in model_fields:
+                if PYDANTIC_V2:
+                    _extra[key] = value
+                else:
+                    fields_values[key] = value
 
         object.__setattr__(m, "__dict__", fields_values)
         if _fields_set is None:
             _fields_set = set(fields_values.keys())
-        object.__setattr__(m, "__fields_set__", _fields_set)
-        m._init_private_attributes()
+
+        if PYDANTIC_V2:
+            # these properties are copied from Pydantic's `model_construct()` method
+            object.__setattr__(m, "__pydantic_private__", None)
+            object.__setattr__(m, "__pydantic_extra__", _extra)
+            object.__setattr__(m, "__pydantic_fields_set__", _fields_set)
+        else:
+            # init_private_attributes() does not exist in v2
+            m._init_private_attributes()  # type: ignore
+
+            # copied from Pydantic v1's `construct()` method
+            object.__setattr__(m, "__fields_set__", _fields_set)
+
         return m
 
+    if not TYPE_CHECKING:
+        # type checkers incorrectly complain about this assignment
+        # because the type signatures are technically different
+        # although not in practice
+        model_construct = construct
 
-def _construct_field(value: object, field: ModelField) -> object:
+
+def _construct_field(value: object, field: FieldInfo, key: str) -> object:
     if value is None:
-        return field.get_default()
+        return field_get_default(field)
+
+    if PYDANTIC_V2:
+        type_ = field.annotation
+    else:
+        type_ = cast(type, field.outer_type_)  # type: ignore
 
-    return construct_type(value=value, type_=field.outer_type_)
+    if type_ is None:
+        raise RuntimeError(f"Unexpected field type is None for {key}")
+
+    return construct_type(value=value, type_=type_)
 
 
 def construct_type(*, value: object, type_: type) -> object:
@@ -91,9 +145,10 @@ def construct_type(*, value: object, type_: type) -> object:
     args = get_args(type_)
 
     if is_union(origin):
-        new_value, error = _create_pydantic_field(type_).validate(value, {}, loc="")
-        if not error:
-            return new_value
+        try:
+            return validate_type(type_=type_, value=value)
+        except Exception:
+            pass
 
         # if the data is not valid, use the first variant that doesn't fail while deserializing
         for variant in args:
@@ -158,38 +213,48 @@ def construct_type(*, value: object, type_: type) -> object:
 def validate_type(*, type_: type[_T], value: object) -> _T:
     """Strict validation that the given value matches the expected type"""
     if inspect.isclass(type_) and issubclass(type_, pydantic.BaseModel):
-        return cast(_T, type_.parse_obj(value))
+        return cast(_T, parse_obj(type_, value))
 
-    model = _create_pydantic_model(type_).validate(value)
-    return cast(_T, model.__root__)
+    return _validate_non_model_type(type_=type_, value=value)
 
 
-def _create_pydantic_model(type_: _T) -> Type[RootModel[_T]]:
-    return RootModel[type_]  # type: ignore
+# our use of subclasssing here causes weirdness for type checkers,
+# so we just pretend that we don't subclass
+if TYPE_CHECKING:
+    GenericModel = BaseModel
+else:
 
+    class GenericModel(BaseGenericModel, BaseModel):
+        pass
 
-def _create_pydantic_field(type_: type) -> ModelField:
-    # TODO: benchmark this
-    model_type = cast(Type[RootModel[object]], RootModel[type_])  # type: ignore
-    return model_type.__fields__["__root__"]
 
+if PYDANTIC_V2:
+    from pydantic import TypeAdapter
 
-class GenericModel(BaseModel, pydantic.generics.GenericModel):
-    pass
+    def _validate_non_model_type(*, type_: type[_T], value: object) -> _T:
+        return TypeAdapter(type_).validate_python(value)
 
+elif not TYPE_CHECKING:  # TODO: condition is weird
 
-class RootModel(GenericModel, Generic[_T]):
-    """Used as a placeholder to easily convert runtime types to a Pydantic format
-    to provide validation.
+    class RootModel(GenericModel, Generic[_T]):
+        """Used as a placeholder to easily convert runtime types to a Pydantic format
+        to provide validation.
 
-    For example:
-    ```py
-    validated = RootModel[int](__root__='5').__root__
-    # validated: 5
-    ```
-    """
+        For example:
+        ```py
+        validated = RootModel[int](__root__='5').__root__
+        # validated: 5
+        ```
+        """
+
+        __root__: _T
 
-    __root__: _T
+    def _validate_non_model_type(*, type_: type[_T], value: object) -> _T:
+        model = _create_pydantic_model(type_).validate(value)
+        return cast(_T, model.__root__)
+
+    def _create_pydantic_model(type_: _T) -> Type[RootModel[_T]]:
+        return RootModel[type_]  # type: ignore
 
 
 @final
@@ -208,8 +273,12 @@ class FinalRequestOptions(pydantic.BaseModel):
     json_data: Union[Body, None] = None
     extra_json: Union[AnyMapping, None] = None
 
-    class Config(pydantic.BaseConfig):
-        arbitrary_types_allowed: bool = True
+    if PYDANTIC_V2:
+        model_config: ClassVar[ConfigDict] = ConfigDict(arbitrary_types_allowed=True)
+    else:
+
+        class Config(pydantic.BaseConfig):  # pyright: ignore[reportDeprecated]
+            arbitrary_types_allowed: bool = True
 
     def get_max_retries(self, max_retries: int) -> int:
         if isinstance(self.max_retries, NotGiven):
@@ -224,12 +293,18 @@ def get_max_retries(self, max_retries: int) -> int:
     def construct(
         cls,
         _fields_set: set[str] | None = None,
-        **values: object,
+        **values: Any,
     ) -> FinalRequestOptions:
-        kwargs = {
+        kwargs: dict[str, Any] = {
             # we unconditionally call `strip_not_given` on any value
             # as it will just ignore any non-mapping types
             key: strip_not_given(value)
             for key, value in values.items()
         }
-        return super().construct(_fields_set, **kwargs)
+        if PYDANTIC_V2:
+            return super().model_construct(_fields_set, **kwargs)
+        return cast(FinalRequestOptions, super().construct(_fields_set, **kwargs))  # pyright: ignore[reportDeprecated]
+
+    if not TYPE_CHECKING:
+        # type checkers incorrectly complain about this assignment
+        model_construct = construct
diff --git a/src/anthropic/_types.py b/src/anthropic/_types.py
index 6ebcf598..125e1fa2 100644
--- a/src/anthropic/_types.py
+++ b/src/anthropic/_types.py
@@ -154,3 +154,5 @@ def get(self, __key: str) -> str | None:
     "ResponseT",
     bound="Union[str, None, BaseModel, List[Any], Dict[str, Any], httpx.Response, UnknownResponse, ModelBuilderProtocol]",
 )
+
+StrBytesIntFloat = Union[str, bytes, int, float]
diff --git a/src/anthropic/_utils/_transform.py b/src/anthropic/_utils/_transform.py
index 839d3d03..9bb71090 100644
--- a/src/anthropic/_utils/_transform.py
+++ b/src/anthropic/_utils/_transform.py
@@ -4,8 +4,6 @@
 from datetime import date, datetime
 from typing_extensions import Literal, get_args, get_type_hints
 
-from pydantic.typing import is_typeddict
-
 from ._utils import (
     is_list,
     is_mapping,
@@ -16,6 +14,7 @@
     is_annotated_type,
     strip_annotated_type,
 )
+from .._compat import is_typeddict
 
 _T = TypeVar("_T")
 
diff --git a/src/anthropic/_utils/_utils.py b/src/anthropic/_utils/_utils.py
index 04bee66c..af575663 100644
--- a/src/anthropic/_utils/_utils.py
+++ b/src/anthropic/_utils/_utils.py
@@ -7,13 +7,10 @@
 from pathlib import Path
 from typing_extensions import Required, Annotated, TypeGuard, get_args, get_origin
 
-from pydantic.typing import is_union as _is_union
-
-# re-export for forwards compat
-from pydantic.datetime_parse import parse_date as parse_date
-from pydantic.datetime_parse import parse_datetime as parse_datetime
-
 from .._types import NotGiven, FileTypes
+from .._compat import is_union as _is_union
+from .._compat import parse_date as parse_date
+from .._compat import parse_datetime as parse_datetime
 
 _T = TypeVar("_T")
 CallableT = TypeVar("CallableT", bound=Callable[..., Any])
diff --git a/tests/test_models.py b/tests/test_models.py
index 33368c15..41a30e7b 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -5,6 +5,7 @@
 import pytest
 from pydantic import Field
 
+from anthropic._compat import PYDANTIC_V2, parse_obj, model_dump, model_json
 from anthropic._models import BaseModel
 
 
@@ -150,18 +151,18 @@ def test_unknown_fields() -> None:
     assert m2.foo == "foo"
     assert cast(Any, m2).unknown == {"foo_bar": True}
 
-    assert m2.dict() == {"foo": "foo", "unknown": {"foo_bar": True}}
+    assert model_dump(m2) == {"foo": "foo", "unknown": {"foo_bar": True}}
 
 
 def test_strict_validation_unknown_fields() -> None:
     class Model(BaseModel):
         foo: str
 
-    model = Model.parse_obj(dict(foo="hello!", user="Robert"))
+    model = parse_obj(Model, dict(foo="hello!", user="Robert"))
     assert model.foo == "hello!"
     assert cast(Any, model).user == "Robert"
 
-    assert model.dict() == {"foo": "hello!", "user": "Robert"}
+    assert model_dump(model) == {"foo": "hello!", "user": "Robert"}
 
 
 def test_aliases() -> None:
@@ -290,8 +291,12 @@ class Model(BaseModel):
     assert cast(bool, m.foo) is True
 
     m = Model.construct(foo={"name": 3})
-    assert isinstance(m.foo, Submodel2)
-    assert m.foo.name == "3"
+    if PYDANTIC_V2:
+        assert isinstance(m.foo, Submodel1)
+        assert m.foo.name == 3  # type: ignore
+    else:
+        assert isinstance(m.foo, Submodel2)
+        assert m.foo.name == "3"
 
 
 def test_list_of_unions() -> None:
@@ -417,15 +422,19 @@ class Model(BaseModel):
         created_at: datetime
 
     expected = datetime(2019, 12, 27, 18, 11, 19, 117000, tzinfo=timezone.utc)
-    expected_json = '{"created_at": "2019-12-27T18:11:19.117000+00:00"}'
+
+    if PYDANTIC_V2:
+        expected_json = '{"created_at":"2019-12-27T18:11:19.117Z"}'
+    else:
+        expected_json = '{"created_at": "2019-12-27T18:11:19.117000+00:00"}'
 
     model = Model.construct(created_at="2019-12-27T18:11:19.117Z")
     assert model.created_at == expected
-    assert model.json() == expected_json
+    assert model_json(model) == expected_json
 
-    model = Model.parse_obj(dict(created_at="2019-12-27T18:11:19.117Z"))
+    model = parse_obj(Model, dict(created_at="2019-12-27T18:11:19.117Z"))
     assert model.created_at == expected
-    assert model.json() == expected_json
+    assert model_json(model) == expected_json
 
 
 def test_coerces_int() -> None:
@@ -443,3 +452,22 @@ class Model(BaseModel):
     # mismatched types are left as-is
     m = Model.construct(bar={"foo": "bar"})
     assert m.bar == {"foo": "bar"}  # type: ignore[comparison-overlap]
+
+
+def test_deprecated_alias() -> None:
+    class Model(BaseModel):
+        resource_id: str = Field(alias="model_id")
+
+        @property
+        def model_id(self) -> str:
+            return self.resource_id
+
+    m = Model.construct(model_id="id")
+    assert m.model_id == "id"
+    assert m.resource_id == "id"
+    assert m.resource_id is m.model_id
+
+    m = parse_obj(Model, {"model_id": "id"})
+    assert m.model_id == "id"
+    assert m.resource_id == "id"
+    assert m.resource_id is m.model_id
diff --git a/tests/utils.py b/tests/utils.py
index a2cec3d1..0a1733f6 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -5,27 +5,46 @@
 from datetime import date, datetime
 from typing_extensions import Literal, get_args, get_origin, assert_type
 
+from anthropic._types import NoneType
 from anthropic._utils import is_dict, is_list, is_list_type, is_union_type
+from anthropic._compat import PYDANTIC_V2, field_outer_type, get_model_fields
 from anthropic._models import BaseModel
 
 BaseModelT = TypeVar("BaseModelT", bound=BaseModel)
 
 
 def assert_matches_model(model: type[BaseModelT], value: BaseModelT, *, path: list[str]) -> bool:
-    for name, field in model.__fields__.items():
+    for name, field in get_model_fields(model).items():
         field_value = getattr(value, name)
-
-        if field.allow_none and field_value is None:
-            continue
-
-        assert_matches_type(field.outer_type_, field_value, path=[*path, name])
+        if PYDANTIC_V2:
+            allow_none = False
+        else:
+            # in v1 nullability was structured differently
+            # https://docs.pydantic.dev/2.0/migration/#required-optional-and-nullable-fields
+            allow_none = getattr(field, "allow_none", False)
+
+        assert_matches_type(
+            field_outer_type(field),
+            field_value,
+            path=[*path, name],
+            allow_none=allow_none,
+        )
 
     return True
 
 
 # Note: the `path` argument is only used to improve error messages when `--showlocals` is used
-def assert_matches_type(type_: Any, value: object, *, path: list[str]) -> None:
-    if type_ is None:
+def assert_matches_type(
+    type_: Any,
+    value: object,
+    *,
+    path: list[str],
+    allow_none: bool = False,
+) -> None:
+    if allow_none and value is None:
+        return
+
+    if type_ is None or type_ is NoneType:
         assert value is None
         return