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Pydantic AI Updates: April 11, 2026

pydantic-ai agents open-source python

1. Pydantic AI v1.80.0 Introduces CapabilityOrdering and Server-Side Compaction

Pydantic AI. Pydantic AI v1.80.0 introduces CapabilityOrdering (innermost, outermost, wraps, wrapped_by, requires) for controlling capability composition order, plus server-side compaction support via OpenAICompaction and AnthropicCompaction capabilities. Bug fixes include correcting global retry counter exhaustion on unknown tool calls and output validator behavior on the tool output path. Source