2
Anthropic and OpenAI Python SDKs both move to the httpx2 fork, breaking changes in v1.0/v3.0
2026-08-20
Anthropic released Python SDK v1.0, moving the HTTP layer from httpx to a maintained, API-compatible fork called httpx2, requiring Python 3.10+, and removing long-deprecated surface (legacy Text Completions API, temperature/top_p/top_k on Messages, client-side compaction_control). OpenAI made the equivalent httpx2 move in its own v3.0 SDK release two weeks earlier.
Significance 2: Routine SDK maintenance with real breaking-change impact for API consumers, but it does not move any tracked model score or verdict.
Infra / compute Release
Sources
- primary Claude Platform release notes retrieved 2026-08-26
- curator llm-anthropic 0.27 retrieved 2026-08-26