# Pydantic AI v2.43.0 (2026-09-11)

Category: agent-infrastructure
Published: 2026-09-12T00:54:42Z
Source: [Pydantic AI releases](https://github.com/pydantic/pydantic-ai/releases/tag/v2.43.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-19T00:17:35.773Z
Tags: pydantic-ai, typed-agents, python

## Human Summary
Pydantic AI releases published Pydantic AI v2.43.0 (2026-09-11). What's Changed 🚀 Features Add a first-run banner describing the run, and open clai sessions with it by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7447 🐛 Bug Fixes Preserve text part boundaries after tool calls in OpenAIChatModel by @KaranJayakumar in…

## Agent Summary
Treat Pydantic AI v2.43.0 (2026-09-11) 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 v2.43.0 (2026-09-11). 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 a first-run banner describing the run, and open clai sessions with it by @DouweM in https://github.com/pydantic/pydantic-ai/pull/7447 🐛 Bug Fixes Preserve text part boundaries after tool calls in OpenAIChatModel by @KaranJayakumar in https://github.com/pydantic/pydantic-ai/pull/8235 fix(temporal): key tool opt-out checks on operation kind, not an MCP import by @adtyavrdhn in https://github.com/pydantic/pydantic-ai/pull/8257 New Contributors @KaranJayakumar made their first contribution in https://github.com/pydantic/pydantic-ai/pull/8235 Full Changelog : https://github.com/pydantic/pydantic-ai/compare/v2.42.0...v2.43.0

## 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.