2.9.0

2.9.0 (2025-12-04)

Full Changelog: v2.8.1...v2.9.0

Features

• api: gpt-5.1-codex-max and responses/compact (22f646e)

Bug Fixes

• client: avoid mutating user-provided response config object (#2700) (e040d22)
• ensure streams are always closed (0b1a27f)
• streaming: correct indentation (575bbac)

Chores

• deps: mypy 1.18.1 has a regression, pin to 1.17 (22cd586)
• docs: use environment variables for authentication in code snippets (c2a3cd5)
• internal: codegen related update (307a066)
• update lockfile (b4109c5)