Handle None input_tokens from Anthropic SDK #1674
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With version 0.51.0 of the Anthropic Python SDK, Anthropic models in Pydantic AI no longer work with streaming due to how we unpack the input_tokens field. Previously we assumed that
getattr(response_usage, 'input_tokens', 0)
would always be anint
, which is no longer trueI have not added a test case for this, since the current tests already capture the bug and fail when the current version of Anthropic SDK is installed (a win for the awesome test coverage!!)