Fix: Handle dict objects in Anthropic streaming response

[jgowdy-godaddy]

Fixes #10792

Summary

• Fixed an issue where dictionary objects in Anthropic streaming responses were not properly converted to SSE format strings
• When using the Anthropic endpoint in streaming mode, the function was directly yielding dictionary objects
• Added proper type checking and formatting for dictionary objects in the streaming response

Test plan

• Start the LiteLLM proxy server
• Send a POST request to with streaming enabled
• Verify that the streaming response works correctly and doesn't throw AttributeError

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 22, 2025 0:33am

[CLAassistant]

All committers have signed the CLA.

[ishaan-jaff]

Thanks, reviewed. Please add a test tests/litellm/proxy/anthropic_endpoints/test_endpoints.py

[ishaan-jaff]

@jgowdy-godaddy were you able to see the original issue ? I'm on an older version and don't see the issue

Tried this curl command

curl -X POST http://localhost:4000/v1/messages \
  -H "content-type: application/json" \
  -H "accept: application/json" \
  -H "Authorization: Bearer sk-1234" \
  -d '{
    "model": "claude-3-5-haiku-20241022",
    "max_tokens": 512,
    "messages": [
      {
        "role": "user",
        "content": "Hi"
      }
    ],
    "system": [
      {
        "type": "text",
        "text": "You are an AI Agent"
      }
    ],
    "temperature": 0,
    "stream": true
  }'
``