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Pydantic AI Updates: September 4, 2026

pydantic-ai python agents observability

1. Pydantic AI v2.39.0 Adds gpt-6-astra and Fixes Instrumentation Leaks

Pydantic AI. The release adds OpenAI gpt-6-astra model support the day after the model launched. Fixes cover a context_subtree() exporter cache that leaked span processors, the restored Instrumentation spec option include_model_request_parameters with a sharper undeclared-attribute merge error, Azure content-filter error detection for both AzureProvider and AsyncAzureOpenAI clients on OpenAIProvider, speech finalized by a tool call now emitted on stream_transcripts(), and tool-returned media attributed to its originating tool call when it cannot ride the tool result. Source