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)

v1.20.0

1.20.0 (2026-01-29)

Full Changelog: v1.19.0...v1.20.0

Features

• api: add support for Structured Outputs in the Messages API (10c3821)
• api: migrate sending message format in output_config rather than output_format (f996db4)
• client: add a convenient param.SetJSON helper (427514e)
• encoder: support bracket encoding form-data object members (eaaeadf)

Bug Fixes

• accumulator: revert to marshal accumulator on stop events (#563) (096a8a8)
• client: retain streaming when user sets request body (6d073fe)
• docs: add missing pointer prefix to api.md return types (23aaf6d)
• mcp: correct code tool API endpoint (6c8a083)
• rename param to avoid collision (6d1cf75)
• streaming endpoints should pass through errors correctly (e584c87)
• to-param: remove panics and add cases (#524) (f689816)

Chores

• add float64 to valid types for RegisterFieldValidator (b6bec73)
• ci: Add Claude Code GitHub Workflow (a151836)
• client: improve example values (8af69b8)
• client: mark claude-3-5-haiku as deprecated (dcac65c)
• elide duplicate aliases (c8e2ee1)
• internal: codegen related update (931c976)
• internal: update actions/checkout version (3bd83ec)
• internal: use different example values for some enums (f2d46b8)

v1.19.0

1.19.0 (2025-11-24)

Full Changelog: v1.18.1...v1.19.0

Features

• api: adds support for Claude Opus 4.5, Effort, Advance Tool Use Features, Autocompaction, and Computer Use v5 (a03391c)