Anthropic Python SDK v1.0.0 — first stable major; httpx2 upgrade with breaking changes

Anthropic

Tools official 1 src. ~1 min

First stable major of the Anthropic Python SDK, released Aug 20. Upgrades to httpx2 with breaking changes documented in MIGRATION.md. Also stops warning about output_format= on the parse/stream/tool_runner helpers and restores original event imports in lib/streaming/_types.py.

Why it matters

Major-version bump of the official Python SDK is a maintenance signal for downstream projects pinned to 0.x — pinning will need to change. Worth flagging for anyone running production code against the SDK.

Importance: 3/5

Anthropic first-stable-major SDK release

anthropic sdk python release ga developer-api

Sources

official GitHub release