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Pydantic AI Updates: April 16, 2026

pydantic-ai framework open-source

1. PydanticAI v1.83.0: xAI Search, Bedrock Cache TTL, and Graceful Parallel Tools

Pydantic AI. PydanticAI v1.83.0 shipped with support for xAI’s XSearchTool and FileSearch capabilities, metadata injection per tool call with FastMCPToolset, AWS Bedrock prompt cache TTL support, Anthropic automatic prompt caching, and a “graceful” end strategy for parallel tool calls. The release also added optional output support via Agent(output_type=str | None). Source

2. PydanticAI v1.82.0: Compaction Fixes and FastMCP 3.2 Upgrade

Pydantic AI. PydanticAI v1.82.0 resolved OpenAI compaction issues when using openai_previous_response_id='auto', fixed task leaks in CombinedToolset and CombinedCapability, improved performance by computing ToolDefinition.function_signature lazily, and upgraded the fastmcp dependency from 2.x to version 3.2.0. Source