v1.27.1

1.27.1 (2026-03-18)

Full Changelog: v1.27.0...v1.27.1

Chores

• internal: regenerate SDK with no functional changes (c963fd0)
• internal: tweak CI branches (95e3410)

v1.27.0

1.27.0 (2026-03-16)

Full Changelog: v1.26.0...v1.27.0

Features

• api: change array_format to brackets (ca5ae6e)
• api: chore(config): clean up model enum list (#31) (1db4ea7)
• api: GA thinking-display-setting (1924af2)
• api: remove publishing section from cli target (514282e)
• tests: update mock server (cf24ced)

Bug Fixes

• allow canceling a request while it is waiting to retry (32ee053)
• client: update model reference from claude-3-7-sonnet-latest to claude-sonnet-4-5 (2f42e73)

Chores

• client: reorganize code in Messages files to lead to less conflicts (c677bb5)
• internal: codegen related update (c978aac)
• internal: codegen related update (4ac31a2)
• internal: codegen related update (5b2b2fa)
• internal: codegen related update (9678c6c)
• internal: codegen related update (f6035d2)
• internal: codegen related update (9246bbb)
• internal: move custom custom json tags to api (4392627)
• tests: unskip tests that are now supported in steady (b0ca374)

Documentation

• streamline README, centralize documentation at docs.anthropic.com (33f6943), closes #587

v1.26.0

1.26.0 (2026-02-19)

Full Changelog: v1.25.1...v1.26.0

Features

• api: Add top-level cache control (automatic caching) (75f9f70)
• client: add BetaToolRunner for automatic tool use loops (#603) (e44128a)

Chores

• internal: codegen related update (6247d2f)

v1.25.1

1.25.1 (2026-02-19)

Full Changelog: v1.25.0...v1.25.1

Bug Fixes

• client: use correct format specifier for header serialization (9115a61)

v1.25.0

1.25.0 (2026-02-18)

Full Changelog: v1.24.0...v1.25.0

Features

• api: fix shared UserLocation and error code types (cb98cd0)

v1.24.0

1.24.0 (2026-02-18)

Full Changelog: v1.23.0...v1.24.0

Features

• api: Make new tool versions available as top level tool types (54d01f5)

v1.23.0

1.23.0 (2026-02-17)

Full Changelog: v1.22.1...v1.23.0

Features

• api: Releasing claude-sonnet-4-6 (782d5a5)

Bug Fixes

• api: fix spec errors (15e6a5a)
• remove duplicate ServerToolUseBlock struct declaration (#595) (d4ece8a)

v1.22.1

1.22.1 (2026-02-10)

Full Changelog: v1.22.0...v1.22.1

Bug Fixes

• encoder: correctly serialize NullStruct (1435f8a)

v1.22.0

1.22.0 (2026-02-07)

Full Changelog: v1.21.0...v1.22.0

Features

• api: enabling fast-mode in claude-opus-4-6 (ebe6433)

v1.21.0

1.21.0 (2026-02-05)

Full Changelog: v1.20.0...v1.21.0

Features

• api: Release Claude Opus 4.6, adaptive thinking, and other features (e899e64)

Chores

• ci: remove claude-code-review workflow (31db702)