# Pydantic AI v2.45.0 (2026-09-17)

Category: agent-infrastructure
Published: 2026-09-18T04:31:12Z
Source: [Pydantic AI releases](https://github.com/pydantic/pydantic-ai/releases/tag/v2.45.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-19T00:17:33.996Z
Tags: pydantic-ai, typed-agents, python

## Human Summary
Pydantic AI releases published Pydantic AI v2.45.0 (2026-09-17). What's Changed 🚀 Features Add TypeSafeModel for TypeSafe's Jev by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/8450 🐛 Bug Fixes Pass xhigh effort through on Bedrock when the model profile supports it by @willfrey in https://github.com/pydantic/pydantic-ai/pull/8392 Allow…

## Agent Summary
Treat Pydantic AI v2.45.0 (2026-09-17) as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
Pydantic AI releases published Pydantic AI v2.45.0 (2026-09-17). This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: What's Changed 🚀 Features Add TypeSafeModel for TypeSafe's Jev by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/8450 🐛 Bug Fixes Pass xhigh effort through on Bedrock when the model profile supports it by @willfrey in https://github.com/pydantic/pydantic-ai/pull/8392 Allow gpt-5.6-sol , gpt-5.6-luna , and gpt-5.6-terra on Bedrock Converse by @pydanty (https://github.com/apps/pydanty) in https://github.com/pydantic/pydantic-ai/pull/7825 Resolve a DynamicToolset once per durable run instead of inside every durable unit by @DouweM in https://github.com/pydantic/pydantic-ai/pull/8455 Hold one MCP server session per durable run instead of one per durable unit by @DouweM in https://github.com/pydantic/pydantic-ai/pull/8463 Preserve tool history in MCPSamplingModel by @DouweM in https://github.com/pydantic/pydantic-ai/pull/8466 Stop importing legacy httpx in pydantic ai.mcp ,…

## Recommended actions
- Review the official Pydantic AI releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.