diff --git a/pydantic_ai_slim/pydantic_ai/models/__init__.py b/pydantic_ai_slim/pydantic_ai/models/__init__.py
index bc922692ee..8f43120d0d 100644
--- a/pydantic_ai_slim/pydantic_ai/models/__init__.py
+++ b/pydantic_ai_slim/pydantic_ai/models/__init__.py
@@ -34,8 +34,6 @@
 KnownModelName = TypeAliasType(
     'KnownModelName',
     Literal[
-        'anthropic:claude-2.0',
-        'anthropic:claude-2.1',
         'anthropic:claude-3-5-haiku-20241022',
         'anthropic:claude-3-5-haiku-latest',
         'anthropic:claude-3-5-sonnet-20240620',
@@ -46,10 +44,10 @@
         'anthropic:claude-3-haiku-20240307',
         'anthropic:claude-3-opus-20240229',
         'anthropic:claude-3-opus-latest',
-        'anthropic:claude-3-sonnet-20240229',
         'anthropic:claude-4-opus-20250514',
         'anthropic:claude-4-sonnet-20250514',
         'anthropic:claude-opus-4-0',
+        'anthropic:claude-opus-4-1-20250805',
         'anthropic:claude-opus-4-20250514',
         'anthropic:claude-sonnet-4-0',
         'anthropic:claude-sonnet-4-20250514',
@@ -100,8 +98,6 @@
         'bedrock:mistral.mixtral-8x7b-instruct-v0:1',
         'bedrock:mistral.mistral-large-2402-v1:0',
         'bedrock:mistral.mistral-large-2407-v1:0',
-        'claude-2.0',
-        'claude-2.1',
         'claude-3-5-haiku-20241022',
         'claude-3-5-haiku-latest',
         'claude-3-5-sonnet-20240620',
@@ -112,10 +108,10 @@
         'claude-3-haiku-20240307',
         'claude-3-opus-20240229',
         'claude-3-opus-latest',
-        'claude-3-sonnet-20240229',
         'claude-4-opus-20250514',
         'claude-4-sonnet-20250514',
         'claude-opus-4-0',
+        'claude-opus-4-1-20250805',
         'claude-opus-4-20250514',
         'claude-sonnet-4-0',
         'claude-sonnet-4-20250514',
diff --git a/pydantic_ai_slim/pyproject.toml b/pydantic_ai_slim/pyproject.toml
index 00e4512061..8933e06e1e 100644
--- a/pydantic_ai_slim/pyproject.toml
+++ b/pydantic_ai_slim/pyproject.toml
@@ -66,7 +66,7 @@ openai = ["openai>=1.92.0"]
 cohere = ["cohere>=5.16.0; platform_system != 'Emscripten'"]
 vertexai = ["google-auth>=2.36.0", "requests>=2.32.2"]
 google = ["google-genai>=1.28.0"]
-anthropic = ["anthropic>=0.52.0"]
+anthropic = ["anthropic>=0.61.0"]
 groq = ["groq>=0.19.0"]
 mistral = ["mistralai>=1.9.2"]
 bedrock = ["boto3>=1.37.24"]
diff --git a/uv.lock b/uv.lock
index 30257fa7d4..8d2271fcb3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -196,7 +196,7 @@ wheels = [
 
 [[package]]
 name = "anthropic"
-version = "0.52.0"
+version = "0.61.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
@@ -207,9 +207,9 @@ dependencies = [
     { name = "sniffio" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/57/fd/8a9332f5baf352c272494a9d359863a53385a208954c1a7251a524071930/anthropic-0.52.0.tar.gz", hash = "sha256:f06bc924d7eb85f8a43fe587b875ff58b410d60251b7dc5f1387b322a35bd67b", size = 229372, upload-time = "2025-05-22T16:42:22.044Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7a/9a/b384758ef93b8f931a523efc8782f7191b175714b3952ff11002899f638b/anthropic-0.61.0.tar.gz", hash = "sha256:af4b3b8f3bc4626cca6af2d412e301974da1747179341ad9e271bdf5cbd2f008", size = 426606, upload-time = "2025-08-05T16:29:37.958Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a0/43/172c0031654908bbac2a87d356fff4de1b4947a9b14b9658540b69416417/anthropic-0.52.0-py3-none-any.whl", hash = "sha256:c026daa164f0e3bde36ce9cbdd27f5f1419fff03306be1e138726f42e6a7810f", size = 286076, upload-time = "2025-05-22T16:42:20Z" },
+    { url = "https://files.pythonhosted.org/packages/6e/07/c7907eee22f5c27a53118dd2576267052ae01f52811dbb06a2848012639e/anthropic-0.61.0-py3-none-any.whl", hash = "sha256:798c8e6cc61e6315143c3f5847d2f220c45f1e69f433436872a237413ca58803", size = 294935, upload-time = "2025-08-05T16:29:36.379Z" },
 ]
 
 [[package]]
@@ -3481,7 +3481,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "ag-ui-protocol", marker = "extra == 'ag-ui'", specifier = ">=0.1.8" },
-    { name = "anthropic", marker = "extra == 'anthropic'", specifier = ">=0.52.0" },
+    { name = "anthropic", marker = "extra == 'anthropic'", specifier = ">=0.61.0" },
     { name = "argcomplete", marker = "extra == 'cli'", specifier = ">=3.5.0" },
     { name = "boto3", marker = "extra == 'bedrock'", specifier = ">=1.37.24" },
     { name = "cohere", marker = "sys_platform != 'emscripten' and extra == 'cohere'", specifier = ">=5.16.0" },