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Pydantic AI Updates: July 24, 2026

pydantic-ai agents open-source python observability

1. Pydantic AI v2.17.0 Improves Usage Tracking And OpenTelemetry Performance

Pydantic AI. Pydantic AI released v2.17.0, making RequestUsage and RunUsage support arbitrary fields in preparation for upcoming genai-prices pricing data. The release caches per-message OpenTelemetry serialization to avoid quadratic instrumentation overhead on longer runs. It also fixes ContentFilterError handling for Google Model Armor response blocks, improving behavior when a response carries a MODEL_ARMOR finish reason. Source