Initial Checks

• I confirm that I'm using the latest version of Pydantic AI
• I confirm that I searched for my issue inhttps://github.com/pydantic/pydantic-ai/issues before opening this issue

Description

Structured streaming doesn't work with Claude models when using via Bedrock.

I tried using stream whales example as-is and it seems to work fine with the openai gpt model used in that example.
When using a Claude model, the streaming does not work and data is sent as one chunk.

Can confirm if I change output type to just a string, streaming works fine but in my use case I need structured output.

I have seen similar issues when using Claude models directly:

• Structured streaming doesn't work with claude (Stream Whale example) #1665

Example Code

Python, Pydantic AI & LLM client version

Python 3.12PydanticAI 0.2.12