From 5d57f5bd0fbc3591c4635a595b7290b72a24d1d7 Mon Sep 17 00:00:00 2001
From: Jeremiah Lowin <153965+jlowin@users.noreply.github.com>
Date: Tue, 9 Dec 2025 19:29:02 -0500
Subject: [PATCH] Use claude-sonnet-4-5-20250929 model name

---
 docs/clients/sampling.mdx                | 2 +-
 docs/servers/sampling.mdx                | 2 +-
 examples/sampling/server_fallback.py     | 2 +-
 examples/sampling/structured_output.py   | 2 +-
 examples/sampling/text.py                | 2 +-
 examples/sampling/tool_use.py            | 2 +-
 src/fastmcp/server/sampling/anthropic.py | 2 +-
 7 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/docs/clients/sampling.mdx b/docs/clients/sampling.mdx
index 5097faf43..7ad39ade4 100644
--- a/docs/clients/sampling.mdx
+++ b/docs/clients/sampling.mdx
@@ -287,7 +287,7 @@ from fastmcp import Client
 from fastmcp.server.sampling.anthropic import AnthropicSamplingHandler
 
 handler = AnthropicSamplingHandler(
-    default_model="claude-sonnet-4-20250514",
+    default_model="claude-sonnet-4-5-20250929",
     client=Anthropic(),  # Uses ANTHROPIC_API_KEY env var
 )
 
diff --git a/docs/servers/sampling.mdx b/docs/servers/sampling.mdx
index a5ede6c8d..ea44eac62 100644
--- a/docs/servers/sampling.mdx
+++ b/docs/servers/sampling.mdx
@@ -466,7 +466,7 @@ from fastmcp.server.sampling.anthropic import AnthropicSamplingHandler
 server = FastMCP(
     name="Sampling Server",
     sampling_handler=AnthropicSamplingHandler(
-        default_model="claude-sonnet-4-20250514",
+        default_model="claude-sonnet-4-5-20250929",
     ),
     sampling_handler_behavior="fallback",
 )
diff --git a/examples/sampling/server_fallback.py b/examples/sampling/server_fallback.py
index 6bcc2bade..88ecf8ca1 100644
--- a/examples/sampling/server_fallback.py
+++ b/examples/sampling/server_fallback.py
@@ -49,7 +49,7 @@ class LoggingAnthropicHandler(AnthropicSamplingHandler):
 
 mcp = FastMCP(
     "Server with Fallback",
-    sampling_handler=LoggingAnthropicHandler(default_model="claude-sonnet-4-20250514"),
+    sampling_handler=LoggingAnthropicHandler(default_model="claude-sonnet-4-5-20250929"),
 )
 
 
diff --git a/examples/sampling/structured_output.py b/examples/sampling/structured_output.py
index 946575cb7..9c6c6c884 100644
--- a/examples/sampling/structured_output.py
+++ b/examples/sampling/structured_output.py
@@ -110,7 +110,7 @@ async def main():
     )
     console.print()
 
-    handler = LoggingAnthropicHandler(default_model="claude-sonnet-4-20250514")
+    handler = LoggingAnthropicHandler(default_model="claude-sonnet-4-5-20250929")
 
     test_texts = [
         ("I love this! Best purchase ever!", "😊"),
diff --git a/examples/sampling/text.py b/examples/sampling/text.py
index b64ece840..dc8441da7 100644
--- a/examples/sampling/text.py
+++ b/examples/sampling/text.py
@@ -105,7 +105,7 @@ async def main():
     )
     console.print()
 
-    handler = LoggingAnthropicHandler(default_model="claude-sonnet-4-20250514")
+    handler = LoggingAnthropicHandler(default_model="claude-sonnet-4-5-20250929")
 
     async with Client(mcp, sampling_handler=handler) as client:
         # Example 1
diff --git a/examples/sampling/tool_use.py b/examples/sampling/tool_use.py
index ea2b26c32..9d2f00e96 100644
--- a/examples/sampling/tool_use.py
+++ b/examples/sampling/tool_use.py
@@ -133,7 +133,7 @@ async def main():
     )
     console.print()
 
-    handler = LoggingAnthropicHandler(default_model="claude-sonnet-4-20250514")
+    handler = LoggingAnthropicHandler(default_model="claude-sonnet-4-5-20250929")
 
     questions = [
         "What's 15% tip on a $47.50 bill?",
diff --git a/src/fastmcp/server/sampling/anthropic.py b/src/fastmcp/server/sampling/anthropic.py
index 3a1b911d0..20abeac12 100644
--- a/src/fastmcp/server/sampling/anthropic.py
+++ b/src/fastmcp/server/sampling/anthropic.py
@@ -294,7 +294,7 @@ class AnthropicSamplingHandler:
             "claude-3-5-sonnet-20240620",
             "claude-3-5-sonnet-20241022",
             "claude-3-5-haiku-20241022",
-            "claude-sonnet-4-20250514",
+            "claude-sonnet-4-5-20250929",
             "claude-opus-4-5-20251101",
         }