diff --git a/README.md b/README.md
index cd376246..10ed0842 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ message = client.messages.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 print(message.content)
 ```
@@ -70,7 +70,7 @@ async def main() -> None:
                 "content": "Hello, Claude",
             }
         ],
-        model="claude-3-opus-20240229",
+        model="claude-3-5-sonnet-latest",
     )
     print(message.content)
 
@@ -97,7 +97,7 @@ stream = client.messages.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
     stream=True,
 )
 for event in stream:
@@ -119,7 +119,7 @@ stream = await client.messages.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
     stream=True,
 )
 async for event in stream:
@@ -145,7 +145,7 @@ async def main() -> None:
                 "content": "Say hello there!",
             }
         ],
-        model="claude-3-opus-20240229",
+        model="claude-3-5-sonnet-latest",
     ) as stream:
         async for text in stream.text_stream:
             print(text, end="", flush=True)
@@ -399,7 +399,7 @@ try:
                 "content": "Hello, Claude",
             }
         ],
-        model="claude-3-opus-20240229",
+        model="claude-3-5-sonnet-latest",
     )
 except anthropic.APIConnectionError as e:
     print("The server could not be reached")
@@ -440,7 +440,7 @@ message = client.messages.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 print(message._request_id)  # req_018EeWyXxfu5pfWkrYcMdjWG
 ```
@@ -475,7 +475,7 @@ client.with_options(max_retries=5).messages.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 ```
 
@@ -507,7 +507,7 @@ client.with_options(timeout=5.0).messages.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 ```
 
@@ -571,7 +571,7 @@ response = client.messages.with_raw_response.create(
         "role": "user",
         "content": "Hello, Claude",
     }],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 print(response.headers.get('X-My-Header'))
 
@@ -605,7 +605,7 @@ with client.messages.with_streaming_response.create(
             "content": "Hello, Claude",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 ) as response:
     print(response.headers.get("X-My-Header"))
 
diff --git a/examples/images.py b/examples/images.py
index 0da834bc..0ebf2eb5 100644
--- a/examples/images.py
+++ b/examples/images.py
@@ -25,6 +25,6 @@
             ],
         },
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 print(response.model_dump_json(indent=2))
diff --git a/examples/messages.py b/examples/messages.py
index f2e7e3c2..55151dd0 100644
--- a/examples/messages.py
+++ b/examples/messages.py
@@ -10,7 +10,7 @@
             "content": "Hello!",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 print(response)
 
@@ -30,6 +30,6 @@
             "content": "How are you?",
         },
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 )
 print(response2)
diff --git a/examples/messages_stream.py b/examples/messages_stream.py
index be69a2c1..a7288aab 100644
--- a/examples/messages_stream.py
+++ b/examples/messages_stream.py
@@ -14,7 +14,7 @@ async def main() -> None:
                 "content": "Say hello there!",
             }
         ],
-        model="claude-3-opus-20240229",
+        model="claude-3-5-sonnet-latest",
     ) as stream:
         async for event in stream:
             if event.type == "text":
diff --git a/examples/tools.py b/examples/tools.py
index c0a8ea60..b6978757 100644
--- a/examples/tools.py
+++ b/examples/tools.py
@@ -21,7 +21,7 @@
 ]
 
 message = client.messages.create(
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
     max_tokens=1024,
     messages=[user_message],
     tools=tools,
@@ -32,7 +32,7 @@
 
 tool = next(c for c in message.content if c.type == "tool_use")
 response = client.messages.create(
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
     max_tokens=1024,
     messages=[
         user_message,
diff --git a/helpers.md b/helpers.md
index 55c249a2..65eac0bf 100644
--- a/helpers.md
+++ b/helpers.md
@@ -11,7 +11,7 @@ async with client.messages.stream(
             "content": "Say hello there!",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 ) as stream:
     async for text in stream.text_stream:
         print(text, end="", flush=True)
@@ -60,7 +60,7 @@ async with client.messages.stream(
             "content": "Say hello there!",
         }
     ],
-    model="claude-3-opus-20240229",
+    model="claude-3-5-sonnet-latest",
 ) as stream:
     async for event in stream:
         if event.type == "text":
diff --git a/tests/test_client.py b/tests/test_client.py
index f50233f0..ca181ada 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -745,7 +745,7 @@ def test_retrying_timeout_errors_doesnt_leak(self, respx_mock: MockRouter) -> No
                                 "content": "Hello, Claude",
                             }
                         ],
-                        model="claude-3-opus-20240229",
+                        model="claude-3-5-sonnet-latest",
                     ),
                 ),
                 cast_to=httpx.Response,
@@ -772,7 +772,7 @@ def test_retrying_status_errors_doesnt_leak(self, respx_mock: MockRouter) -> Non
                                 "content": "Hello, Claude",
                             }
                         ],
-                        model="claude-3-opus-20240229",
+                        model="claude-3-5-sonnet-latest",
                     ),
                 ),
                 cast_to=httpx.Response,
@@ -1625,7 +1625,7 @@ async def test_retrying_timeout_errors_doesnt_leak(self, respx_mock: MockRouter)
                                 "content": "Hello, Claude",
                             }
                         ],
-                        model="claude-3-opus-20240229",
+                        model="claude-3-5-sonnet-latest",
                     ),
                 ),
                 cast_to=httpx.Response,
@@ -1652,7 +1652,7 @@ async def test_retrying_status_errors_doesnt_leak(self, respx_mock: MockRouter)
                                 "content": "Hello, Claude",
                             }
                         ],
-                        model="claude-3-opus-20240229",
+                        model="claude-3-5-sonnet-latest",
                     ),
                 ),
                 cast_to=httpx.Response,