litellm-mirror/docs/my-website/release_notes/v1.63.0/index.md

title	slug	date	authors	tags	hide_table_of_contents
v1.63.0 - Anthropic 'thinking' response update	v1.63.0	2025-03-05T10:00:00	name title url image_url Krrish Dholakia CEO, LiteLLM https://www.linkedin.com/in/krish-d/ 1737327772 name title url image_url Ishaan Jaffer CTO, LiteLLM https://www.linkedin.com/in/reffajnaahsi/ 1675971026	llm translation thinking reasoning_content claude-3-7-sonnet	false

v1.63.0 fixes Anthropic 'thinking' response on streaming to return the signature block. Github Issue

It also moves the response structure from signature_delta to signature to be the same as Anthropic. Anthropic Docs

Diff

"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
        }
    ]
}