v2.55.0 v2.56.0
pydantic/pydantic-aiOct 9, 2026 → Oct 13, 20264 days between releases
What's New
Adds Python 3.15 support, Gemini 4 Argon model, and SmolSandbox workspace
Breaking Changes
- BrowserUse now runs on the host model by default
- Requires Python 3.15 (replaces 3.11 requirement)
New Features
- Support for Python 3.15
- Support for Gemini 4 Argon model
- SmolSandbox workspace for local microVM execution
- Skills layer improvements for project and personal libraries
- Render Workflows integration for Durable Execution
Improvements
- Adds `base_url` argument to `ZaiProvider`
- Removes `WarnNearLimits` from the `Coder` harness capability
- Adds `PGTaskDurability` based on pgtask
Upgrade Notes
Upgrade to Python 3.15 and update `BrowserUse` configuration, as it now runs on the host model by default with opt-in telemetry.
The Two Releases
v2.55.0 (2026-10-09)
Oct 9, 2026· 12 days ago
This release enforces a Python 3.11+ requirement and introduces significant improvements to prompt caching, cross-provider support, and database backends. It adds a new `Conversation` object for state management across runs, support for the `claude-haiku-5-5` model, and new Postgres stores for messages and media.
Full release notesv2.56.0 (2026-10-13)
Oct 13, 2026· 8 days ago
This release introduces major enhancements to the Skills layer, including support for Python 3.15 and the new Gemini 4 Argon model. It also adds a SmolSandbox for local microVM execution and integrates with Render Workflows for durable execution.
Full release notes