docs(index.md): add release note for anthropic update

docs/my-website/docusaurus.config.js

@@ -44,7 +44,7 @@ const config = {
         path: './release_notes',
         routeBasePath: 'release_notes',
         blogTitle: 'Release Notes',
-        blogSidebarTitle: 'All Releases',
+        blogSidebarTitle: 'Releases',
         blogSidebarCount: 'ALL',
         postsPerPage: 'ALL',
         showReadingTime: false,

docs/my-website/release_notes/v1.61.21/index.md

@@ -0,0 +1,38 @@
+---
+title: v1.61.21 - Anthropic 'thinking' response update
+slug: v1.61.21
+date: 2025-03-05T10:00:00
+authors:
+  - name: Krrish Dholakia
+    title: CEO, LiteLLM
+    url: https://www.linkedin.com/in/krish-d/
+    image_url: https://media.licdn.com/dms/image/v2/D4D03AQGrlsJ3aqpHmQ/profile-displayphoto-shrink_400_400/B4DZSAzgP7HYAg-/0/1737327772964?e=1743638400&v=beta&t=39KOXMUFedvukiWWVPHf3qI45fuQD7lNglICwN31DrI
+  - name: Ishaan Jaffer
+    title: CTO, LiteLLM
+    url: https://www.linkedin.com/in/reffajnaahsi/
+    image_url: https://media.licdn.com/dms/image/v2/D4D03AQGiM7ZrUwqu_Q/profile-displayphoto-shrink_800_800/profile-displayphoto-shrink_800_800/0/1675971026692?e=1741824000&v=beta&t=eQnRdXPJo4eiINWTZARoYTfqh064pgZ-E21pQTSy8jc
+tags: [llm translation, thinking, reasoning_content, claude-3-7-sonnet]
+hide_table_of_contents: false
+---
+
+v1.61.21 fixes Anthropic 'thinking' response on streaming to return the `signature` block. [Github Issue](https://github.com/BerriAI/litellm/issues/8964)
+
+It also moves the response structure from `signature_delta` to `signature` to be the same as Anthropic. [Anthropic Docs](https://docs.anthropic.com/en/docs/build-with-claude/extended-thinking#implementing-extended-thinking)
+
+
+## Diff 
+
+```bash
+"message": {
+    ...
+    "reasoning_content": "The capital of France is Paris.",
+    "thinking_blocks": [
+        {
+            "type": "thinking",
+            "thinking": "The capital of France is Paris.",
+-            "signature_delta": "EqoBCkgIARABGAIiQL2UoU0b1OHYi+..." # 👈 OLD FORMAT
++            "signature": "EqoBCkgIARABGAIiQL2UoU0b1OHYi+..." # 👈 KEY CHANGE
+        }
+    ]
+}
+```