0.121.0 (2026-08-07) Full Changelog: v0.120.2...v0.121.0 Features api: add mid-conversation-tool-changes-2026-07-01 beta (c7d1531) api: add support for session budgets, advisor tool, pinned inference location and skills auto-loading from GitHub (193bae0) Chores api: remove retired Claude Opus 4.1 models (5352a33) docs: small updates to descriptions (b8d4176) docs: updates to a few documentation st…
0.120.2 (2026-07-28) Full Changelog: v0.120.1...v0.120.2 Bug Fixes mcp: support mcp sdk v2 alongside v1 (#300) (177f88c)
0.120.1 (2026-07-28) Full Changelog: v0.120.0...v0.120.1 Bug Fixes mcp: pin mcp extra to <2 (#1783) (fb66371)
0.120.0 (2026-07-24) Full Changelog: v0.119.0...v0.120.0 Features api: add claude-opus-5 model (bf4e31c) api: add tool addition/removal blocks and tool_change events (bf4e31c) api: expand client-side fallback credit token types and add server-side fallbacks default option (bf4e31c)
0.119.0 (2026-07-23) Full Changelog: v0.118.0...v0.119.0 Features api: add new stop reason 'model_context_window_exceeded' (d983cde) Bug Fixes tools: handle binary files in agent toolset read/edit (#283) (417b76b)
0.118.0 (2026-07-22) Full Changelog: v0.117.1...v0.118.0 Features api: add support for Managed Agents model effort, initial session events, and threads delta streaming (712bc6f)
0.117.1 (2026-07-21) Full Changelog: v0.117.0...v0.117.1 Bug Fixes aws: handle credentials correctly when using AnthropicAWS.copy() (85d3881) Chores api: add support for new refusal category (d1dea0b) client: docs updates (b14f94c) deps: bump http-snapshot to 0.1.9 (#275) (434b657) deps: pin httpx_aiohttp major version (#271) (924487f) docs: small updates (c48db8b) docs: small updates (755c06c) in…
0.117.0 (2026-07-16) Full Changelog: v0.116.0...v0.117.0 Features api: add support for dreaming (642eee7) api: add support for MCP Tunnels (d716df6) Bug Fixes credentials: keep credential material out of traceback frame locals via SecretStr (aa93a4d) Chores docs: small updates to field descriptions (75d8dcc) docs: update model example (a57e30a) docs: updates to descriptions and examples (e1535b6)
0.116.0 (2026-07-02) Full Changelog: v0.115.1...v0.116.0 Features api: add agent-memory-2026-07-22 beta header (e181d5c)
0.115.1 (2026-07-01) Full Changelog: v0.115.0...v0.115.1 Chores api: remove some nonfunctional types from the SDKs (5e7c431)
0.115.0 (2026-06-30) Full Changelog: v0.114.0...v0.115.0 Features api: add support for Managed Agents event delta streaming, agent overrides, reverse pagination, vault credential injection scoping, and agent and deployment webhook events (8c23f7e)
0.114.0 (2026-06-30) Full Changelog: v0.113.0...v0.114.0 Features api: add support for claude-sonnet-5 (b893033) Bug Fixes agent_toolset: allow absolute paths that resolve inside workdir (#121) (0105529)
0.113.0 (2026-06-29) Full Changelog: v0.112.0...v0.113.0 Features api: add support for 20260318 web fetch and support tools (88dbfb1) Bug Fixes async count_tokens missing output_format/output_config merge block (#162) (122c958) Chores api: accept user profile ID's when counting tokens (0b4d17a) docs: updates to descriptions and example values (f3ab694)
0.112.0 (2026-06-24) Full Changelog: v0.111.0...v0.112.0 Features client: add support for system.message streaming events (2450d59) Bug Fixes memory tool: create parent directories with the correct permissions (#135) (f2fc2a9) Chores api: add support for new refusal category (5ab533e) api: add support for sending User Profile ID in request headers (83319be)
0.111.0 (2026-06-18) Full Changelog: v0.110.0...v0.111.0 Features helpers: tag refusal-fallback middleware requests with fallback-refusal-middleware (#96) (2f8ac78)
0.110.0 (2026-06-18) Full Changelog: v0.109.2...v0.110.0 Features api: add support for new code_execution_20260120 tool (5e23212) Bug Fixes append x-stainless-helper across header merges instead of clobbering (#105) (922558e) bedrock: preserve stream event type (#1682) (b27e343) helpers: single source of truth for x-stainless-helper key + closed value vocabulary (#95) (e6f7a56)
0.109.2 (2026-06-15) Full Changelog: v0.109.1...v0.109.2 Chores api: remove retired models from API and SDKs (d4bcfcc)
0.109.1 (2026-06-09) Full Changelog: v0.109.0...v0.109.1 Bug Fixes api: add frontier_llm refusal category (d3a806b)
0.109.0 (2026-06-09) Full Changelog: v0.108.0...v0.109.0 Features api: add support for Managed Agents deployments and environment variable credentials (47633bf)
0.108.0 (2026-06-09) Full Changelog: v0.107.1...v0.108.0 Features api: add support for claude-mythos-5 and claude-fable-5, with support for server-side fallbacks on refusal (6b76649) client: adds client-side fallbacks middleware for API providers that do not support server-side fallbacks (6b76649)