Fix token usage for anthropic streaming #3111
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Pull Request Overview
This PR fixes token usage calculation for Anthropic streaming responses by ensuring input tokens are properly tracked throughout the streaming process. The fix addresses a bug where input tokens were missing entirely from streaming usage data.
- Replaced manual usage calculation with
genai-priceslibrary'sextract_usagefunction - Updated streaming usage logic to properly accumulate input tokens across message events
- Added comprehensive test coverage for streaming usage scenarios
Reviewed Changes
Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| pydantic_ai_slim/pydantic_ai/models/anthropic.py | Updated _map_usage function to use genai-prices library and fixed streaming token accumulation |
| pydantic_ai_slim/pyproject.toml | Bumped genai-prices dependency to version 0.0.30 |
| tests/models/test_anthropic.py | Added test for streaming usage and updated existing test expectations to include input tokens |
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DouweM
requested changes
Oct 8, 2025
DouweM
approved these changes
Oct 8, 2025
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Wanted to test using genai-prices to extract usage, discovered in the process that anthropic streaming usage was missing input tokens entirely!