1.21.0 (2026-07-24)

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

Features

• api: add claude-opus-5 model (3e67b3d)
• api: add tool addition/removal blocks and tool_change events (3e67b3d)
• api: expand client-side fallback credit token types and add server-side fallbacks default option (3e67b3d)

Bug Fixes

• client: honor ANTHROPIC_BASE_URL in API requests (#43) (0dcaa4f)

Chores

• bump dependency (8358acd)
• ci: cap macOS notarize timeout at 40m; add notary-status debug workflow (#42) (3aa7a80)

1.20.0 (2026-07-23)

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

Features

• api: add new stop reason 'model_context_window_exceeded' (cb2f59e)
• api: manual updates (8f87e6a)

1.19.0 (2026-07-22)

Full Changelog: v1.18.0...v1.19.0

Features

• api: add support for Managed Agents model effort, initial session events, and threads delta streaming (1d61ed6)

Chores

• internal: codegen related update (fd751e4)

1.18.0 (2026-07-16)

Full Changelog: v1.17.0...v1.18.0

Features

• api: add support for MCP Tunnels (25b0012)
• api: manual updates (f40ef8a)

1.17.0 (2026-07-10)

Full Changelog: v1.16.0...v1.17.0

Features

• api: add support for dreaming (9ed8015)

Chores

• docs: update model example (4a5da72)
• docs: updates to descriptions and examples (f81cd30)

1.16.0 (2026-07-02)

Full Changelog: v1.15.0...v1.16.0

Features

• api: add agent-memory-2026-07-22 beta header (4789498)

1.15.0 (2026-07-01)

Full Changelog: v1.14.1...v1.15.0

Features

• api: manual updates (c54265c)

Chores

• api: remove some nonfunctional types from the SDKs (c297011)

1.14.1 (2026-07-01)

Full Changelog: v1.14.0...v1.14.1

Chores

• bump go sdk version (c55fa73)
• sync (aa1cf31)

1.14.0 (2026-06-30)

Full Changelog: v1.13.0...v1.14.0

Features

• api: add support for Managed Agents event delta streaming, agent overrides, reverse pagination, vault credential injection scoping, and agent and deployment webhook events (9dfd032)

1.13.0 (2026-06-30)

Full Changelog: v1.12.2...v1.13.0

Features

• add global --workspace-id flag to set the anthropic-workspace-id header (#6) (2479219)
• api: add support for 20260318 web fetch and support tools (7bb4c88)
• api: add support for claude-sonnet-5 (f558ef8)
• api: manual updates (05f8243)
• api: manual updates (f2230c3)

Chores

• api: accept user profile ID's when counting tokens (ac6bf4b)
• docs: updates to descriptions and example values (7708932)