pydantic-ai Releases

Introduces long-running AI sessions, new models (Opus 4.7, GPT 5.5, DeepSeek V4), Anthropic Containers, and Gemini Deep Research improvements.

May 13, 2026

Adds native tool search, instrumentation capability, and Google structured output support.

May 13, 2026

Adds OpenAI multiple system messages profile and removes Mistral dependency.

May 12, 2026

Adds tool choice setting and new output tool call events.

May 9, 2026

Adds Anthropic task budget support and output retries override.

May 8, 2026

Adds support for OpenAI gpt-image-2 options and DeepSeek v4-flash/v4-pro models, while fixing Unicode preservation in YAML datasets and MCP history replay.

May 7, 2026

Introduces OpenAI Conversations API state support via `openai_conversation_id` and typed OTel metadata for code tool call syntax highlighting, alongside a web UI upgrade.

May 5, 2026

Adds bundled Library Skills for improved coding-agent support and fixes `wrap_validation_errors` on `ToolManager`.

May 1, 2026

Adds `conversation_id` for cross-run correlation, supports dynamic capabilities via callables, and adds `builtin_tools` to `agent.override`.

May 1, 2026

Introduces new validate/process hooks, cross-provider `service_tier`, Anthropic speed modes, and OpenAI Responses `phase` support.

Apr 29, 2026

Adds `HandleDeferredToolCalls` and `ProcessEventStream` capabilities, and handles thinking setting for GPT-5.5.

Apr 25, 2026

Fixes OpenAI streaming chunks, Anthropic container ID handling, tool-call retries validation, and warns about dict fields in Anthropic strict mode.

Apr 24, 2026

Adds RabbitMQ, MSSQL, and Milvus IO connectors, audio transcription parser, and operator persistence to Pathway.

Apr 23, 2026

Adds `UIAdapter.manage_system_prompt` and `ReinjectSystemPrompt` capabilities, and fixes Vercel AI and Gemini 2.5 handling.

Apr 23, 2026

This release focuses on bug fixes, specifically improving error messaging and tool approval detection in Vercel AI integrations. It addresses issues related to validation error inclusion in retry messages and the state of deferred tool approvals.

Apr 21, 2026

This version introduces online evaluation capabilities using OpenTelemetry events to enhance observability and monitoring of AI agents. It provides tools for tracking performance and behavior in real-time.

Apr 21, 2026

A maintenance release that addresses bugs related to tool hook execution and argument validation. It ensures internal tools are handled correctly and that hooks receive properly validated arguments.

Apr 18, 2026

This release includes a security fix for Google FileSearchTool and adds support for Claude Opus 4.7 and stateful compaction. It also improves Ollama integration for structured output.

Apr 17, 2026

Introduces Pydantic AI Harness Code Mode and adds support for xAI tools along with prompt caching capabilities for Bedrock and Anthropic models. This release significantly expands the ecosystem's capabilities.

Apr 16, 2026

A bug fix release that addresses compaction chain issues, task leaks in combined toolsets, and updates the FastMCP dependency. It ensures smoother operation of compaction and tool management features.

Apr 15, 2026