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Pydantic AI Updates: August 4, 2026

pydantic-ai release cost-tracking bedrock

1. Pydantic AI v2.23.0 Adds Cost Tracking and Budget Limits

Pydantic AI. Pydantic AI released v2.23.0, adding a cost field to RunUsage and a cost_limit to UsageLimits so runs can track spend and enforce budgets directly. The release also adds Bedrock support for ModelSettings.extra_headers, restores stable Gemini Gateway aliases, and introduces a ToolAvailabilityDeltaPart for native tool addition and rendering. Additional fixes address Bedrock concurrency validation, Google Cloud credential scoping, and OpenAI streaming timestamp handling. Source