Anthropic SDK v1.0.0

The project released v1.0.0 on 2026-08-20, with a breaking client upgrade to httpx2 plus minor breaking changes and a MIGRATION.md guide. It also fixes a beta warning around output_format on parse/stream/tool_runner helpers and updates documentation examples to use adaptive thinking.

1.0.0 (2026-08-20) Full Changelog: v0.125.0...v1.0.0 ⚠ BREAKING CHANGES client: upgrade to httpx2 and some minor breaking changes. See MIGRATION.md for details Features client: upgrade to httpx2 and some minor breaking changes. See MIGRATION.md for details ( 33e2967 ) Bug Fixes beta: stop warning about output_format= on the parse/stream/tool_runner helpers ( 59bf261 ) Chores streaming: restore the original event imports in lib/streaming/_types.py ( 87e9e01 ) Documentation examples: use adaptive thinking in thinking examples ( b5870af )