Python SDK

OpenAI released v3.15.0 of its Python SDK on September 18, 2026, adding managed Responses WebSocket sessions, prompt-cache prewarming, compaction progress events, and audio-mini model choices. The release also fixes a bug affecting chat stream moderation results.

OpenAI shipped v3.12.0 of its Python SDK on September 10, 2026, adding client support for a new Live API and fixing three bugs related to async streaming and type annotations. The release contains no new model weights.

OpenAI released version 2.53.0 of its Python SDK, adding type definitions referencing a model called 'gpt-5.5' along with new tool name/namespace fields for the Responses API. OpenAI has not made any public announcement about a GPT-5.5 model.

Anthropic has released version 0.114.0 of its Python SDK, adding support for the claude-sonnet-5 model. The update also includes a bug fix for the agent toolset that allows absolute paths resolving inside the working directory.