v1.50.0

1.50.0 (2026-06-24)

Full Changelog: v1.49.0...v1.50.0

Features

• client: add support for system.message streaming events (2333173)
• helpers: single source for x-stainless-helper + tag the BetaToolRunner (#36) (95124e5)

Chores

• api: add support for new refusal category (9b5050f)
• api: add support for sending User Profile ID in request headers (4a263e8)

v1.49.0

1.49.0 (2026-06-18)

Full Changelog: v1.48.2...v1.49.0

Features

• api: add support for new code_execution_20260120 tool (9e4d388)
• client: add HTTP middleware (#30) (e6c7245)

Bug Fixes

• bedrock: decode AWS event-stream framing on streaming responses (2f8d31c)

v1.48.2

1.48.2 (2026-06-15)

Full Changelog: v1.48.1...v1.48.2

Chores

• api: remove retired models from API and SDKs (c429fe1)

v1.48.1

1.48.1 (2026-06-09)

Full Changelog: v1.48.0...v1.48.1

Bug Fixes

• api: add frontier_llm refusal category (5fb7044)

v1.48.0

1.48.0 (2026-06-09)

Full Changelog: v1.47.0...v1.48.0

Features

• api: add support for Managed Agents deployments and environment variable credentials (fcf62cf)

v1.47.0

1.47.0 (2026-06-09)

Full Changelog: v1.46.0...v1.47.0

Features

• api: add support for claude-mythos-5 and claude-fable-5, with support for server-side fallbacks on refusal (41e21c3)

v1.46.0

1.46.0 (2026-06-06)

Full Changelog: v1.45.0...v1.46.0

Features

• api: small updates to Managed Agents types (7edca7a)

v1.45.0

1.45.0 (2026-06-05)

Full Changelog: v1.44.0...v1.45.0

Features

• api: mark Claude Opus 4.1 as deprecated (ccc292f)

Bug Fixes

• streaming: carry encrypted_content through beta compaction accumulator (#938) (6bd298f)
• streaming: carry stop_details and full usage through message_delta (#940) (ef4d2ea)

Chores

• internal: codegen related update (296d6a4)
• internal: fix artifact url (a97bd1e)
• internal: fix branch names (16564d3)
• internal: update staging repo (3f6005b)

Documentation

• point security reports to Anthropic's HackerOne program (#6) (2d0f2af)

v1.44.0

1.44.0 (2026-05-28)

Full Changelog: v1.43.0...v1.44.0

Features

• api: Add support for claude-opus-4-8, mid-conversation system blocks, and usage.output_tokens_details (6e361e7)

Bug Fixes

• internal: preserve path-qualified multipart filenames (SDK-40) (#937) (000e793)

Documentation

• replace literal newlines (e698364)

v1.43.0

1.43.0 (2026-05-21)

Full Changelog: v1.42.0...v1.43.0

Features

• api: Add support for thinking-token-count beta for estimated tokens in thinking block deltas when streaming (9cd8a67)