News

v2.44.0 was released on 2026-06-24 with a bug fix in auth to prioritize the first auth header. This matters because header precedence can affect which credentials are used when multiple auth headers are present, reducing ambiguity and unexpected authentication behavior.

v0.112.0, released on 2026-06-24, adds client support for streaming `system.message` events and includes API updates for a new refusal category and sending a User Profile ID in request headers. The release also fixes the memory tool so it creates parent directories with the correct permissions, a small but important filesystem-safety change.

v0.111.0, released on 2026-06-18, adds a helpers feature that tags refusal-fallback middleware requests with `fallback-refusal-middleware` (#96). This makes it easier to identify and trace fallback refusal handling in middleware flows.

v0.110.0, released on 2026-06-18, adds support for the new `code_execution_20260120` tool in the API and includes bug fixes for header merging, Bedrock stream event type preservation, and `x-stainless-helper` key handling. The notable detail is the new tool integration plus a cleanup of helper/header behavior, which should improve compatibility and reduce subtle request/streaming bugs.

v2.43.0 was released on 2026-06-17, with the only listed feature being an API update to the OpenAPI spec or Stainless config. The change is narrowly scoped and likely affects generated client or schema definitions rather than end-user functionality.

v2.42.0 was released on 2026-06-16 with new features for admin spend_alerts and manual updates, plus an updated OpenAPI spec/Stainless config and build-system changes including release workflow permission fixes and CI environment API keys for examples. The notable detail is that this is a fairly small maintenance-oriented release, but it adds admin spending controls and surfaces infrastructure hardening that can reduce deployment friction and security risk.

v0.109.2, released 2026-06-15, is a maintenance update whose only listed change is a chore to remove retired models from the API and SDKs. This matters because it keeps the surface area clean and prevents clients from relying on deprecated model names.

v2.41.1, released on 2026-06-05, updates the build system by removing the scheduled release workflow trigger in commit 2a91011, via issue #3366. This is a small maintenance change, but it alters release automation and could affect how future releases are triggered.

v0.109.1 (2026-06-09) adds a bug fix to the API by introducing a `frontier_llm` refusal category. This matters because it gives the API a more specific way to classify model refusals, which can improve downstream handling and reporting.

v0.109.0 was released on 2026-06-09, adding API support for Managed Agents deployments and environment variable credentials. This matters because it expands deployment options and makes authentication easier to configure in environment-based setups.

v0.108.0, released on 2026-06-09, adds API support for claude-mythos-5 and claude-fable-5, plus server-side fallbacks on refusal. It also introduces client-side fallbacks middleware for API providers that do not support server-side fallbacks, improving reliability across providers.

v0.107.1 was released on 2026-06-07 with a bug fix in foundry to send the `x-api-key` header when using API-key authentication. This matters because it restores compatibility with endpoints that require that specific header, closing issue #1661.

v0.107.0 was released on 2026-06-06, with the only listed feature being small updates to the Managed Agents API types. It matters mainly as a minor typed API refinement, indicating incremental changes rather than a major functional release.

v0.106.0, released 2026-06-05, marks Claude Opus 4.1 as deprecated and fixes Foundry client `copy()`/`with_options()` behavior plus schema handling so `$defs` are preserved when the root is a `$ref`. That matters because it signals a model lifecycle change while also tightening client and schema tooling used for integrations and code generation.

v2.41.0, released on 2026-06-03, adds `responses.moderation` and `chat_completions.moderation` features in the API. This matters because it extends moderation support to both the Responses and Chat Completions endpoints, making it easier to enforce safety checks across request types.

2.40.0 (2026-06-01) Full Changelog: v2.39.0...v2.40.0 Features api: Add Amazon Bedrock Responses support Bug Fixes api: allow setting bedrock api keys on the client directly (4d5bfde)

v2.39.0, released 2026-06-01, adds workload identity entries to audit logs, an additional_tools item in responses, and makes ActionSearch.query optional. These changes improve observability and response structure while fixing a schema issue that could have made ActionSearch integrations unnecessarily strict.

v0.105.2 was released on 2026-05-29, with the changelog listed as v0.105.1...v0.105.2. It appears to be a minor version update, but the excerpt provides no details about specific changes or model-related updates.

v0.105.1 was released on 2026-05-29 with a single internal chore: switching PyPI releases to Trusted Publishing. The notable detail is that the update is release-process focused rather than a product change, which improves the security and automation of package publishing.

v0.105.0 (2026-05-28) adds API support for claude-opus-4-8, mid-conversation system blocks, and usage.output_tokens_details, and also introduces custom file size caps plus a rename from managed-agents private-sandbox-worker to self-hosted-sandbox-worker in the examples. The notable detail is the expanded API surface for newer Claude functionality and finer-grained token reporting, which should help developers build more flexible agent and sandbox workflows.

v0.104.1, released 2026-05-21, fixes a streaming bug by carrying `encrypted_content` through the beta compaction accumulator. This matters because it preserves encrypted payload data during compaction, preventing loss or corruption in streamed outputs.

Version 2.38.0 was released on 2026-05-21 with API-related changes, including an API update, manual updates, and an updated OpenAPI spec or Stainless config. It also included documentation and release-process chores, such as syncing custom code, removing and triggering release automation, and docs updates.

v0.104.0 adds support for a beta thinking-token-count feature in the API, exposing estimated token counts in thinking block deltas during streaming. This matters because it gives developers more granular visibility into reasoning usage while responses are still being streamed.

v0.103.1, released on 2026-05-19, fixes a runner bug so SessionToolRunner skips tool calls it does not own. The patch is narrowly scoped but important for preventing incorrect tool execution and ownership handling in session workflows.

v0.103.0, released on 2026-05-19, adds client support for self-hosted sandboxes in CMA along with sandbox helpers. This matters because it expands deployment flexibility for sandboxed execution without relying on the default hosted setup.

Version 2.37.0, dated 2026-05-13, adds a `service_tier` parameter to the responses compact method, supports eagerly validating Pydantic iterators in internal types, and removes an unnecessary `client_id` when using a workload identity provider for auth. The release is mostly small API and auth plumbing changes, but the new `service_tier` parameter is the only user-facing addition and may affect how response quality or routing is specified.

v0.102.0, released 2026-05-13, adds BetaManagedAgentsSearchResultBlock types, support for cache diagnostics beta, and eagerly validating pydantic iterators, along with API spec updates. The update mainly expands API surface and validation behavior, which can affect downstream integrations that rely on managed agent search results or iterator handling.

v0.101.0, released 2026-05-11, adds an AWS client for Claude Platform on AWS and fixes a client error-message bug, while also updating examples to use `claude-sonnet-4-5-20250929` and switching the shebang from Poetry to uv. The main notable detail is the new AWS integration, which extends platform connectivity, alongside a small but user-facing bug fix for file type error messaging.

Version 2.36.0 was released on 2026-05-07, with two listed features: `api: manual updates` and `api: realtime 2`. The update suggests continued API development, especially around real-time capabilities, though the excerpt provides no further implementation details.

v2.35.1, released on 2026-05-06, fixes an API regression in the image generation size enum. The change is a targeted bug fix that restores expected size handling without adding new features, which can prevent broken imagegen requests in clients relying on that enum.

Version 2.35.0, dated 2026-05-06, adds API features for “update image 2” and manual updates, updates the top_logprobs parameter description across chat and responses, and includes chores to remove the legacy Python CLI and rename its entrypoint. The release is notable more for cleanup and documentation consistency than major new capability, with the legacy Python CLI explicitly phased out.

v0.100.0, released on 2026-05-06, adds API support for Managed Agents multiagents and outcomes, plus webhooks and vault validation, alongside a webhook configuration fix. The update expands agent orchestration capabilities while tightening API integration details for webhook handling.

v0.99.0, released on 2026-05-05, adds a client feature to target a workspace for OIDC federation token exchange. This matters because it enables more granular authentication flows across workspaces, which can simplify federated access management.

v0.98.1 was released on 2026-05-04 as a small maintenance update after v0.98.0, with the only listed change being a typo fix in an example (#1754). It matters mainly as a housekeeping release, showing no functional changes beyond cleanup.

Version 2.34.0 adds `external_key_id` to projects, `email`/`metadata` params to users, support for Admin API Keys per endpoint, and env-based header configuration, along with several API and type updates. It also fixes Azure auth headers, admin auth handling, timestamp/type issues, and multipart file array formatting, while improving multipart file copying performance and updating file rate-limit/vector-store docs.

Version 0.98.0 adds improved Managed Agents APIs, client support for Workload Identity Federation, interactive OAuth, and auth profiles, plus the ability to set headers via environment variables. It also fixes streaming stop_details propagation, multipart file array field naming, and missing us/eu multi-region base_url branches in the Vertex async client, which should reduce auth and integration issues.

v2.33.0, released on 2026-04-28, adds an API update and includes a bug fix that changes the `prompt_cache_retention` enum value from `in-memory` to `in_memory`, along with a CI chore removing the release-doctor workflow. The enum correction is the notable change because it can affect clients that rely on the exact API value, while the rest of the release is a small maintenance update.

v0.97.0, released on 2026-04-23, adds CMA Memory as a public beta in the API, fixes errors in the API spec, and restores missing API features. It also improves multipart request file-structure copying performance on the client side and includes a few maintenance updates, including a steadier test dependency bumped to v0.22.1.

v0.96.0, released 2026-04-16, adds `claude-opus-4-7`, token budgets, and `user_profiles` in the API, and removes the `release-doctor` workflow from CI. The update expands model and account-management capabilities while simplifying the CI pipeline.

v2.32.0, released 2026-04-15, adds `detail` to `InputFileContent`, introduces an `OAuthErrorCode` type, and expands websocket client support with event handlers, enqueueing before connection, and reconnection. The update also fixes file uploads so file data are sent as a single parameter, which should reduce API misuse and make websocket-driven clients more resilient.

v0.95.0, released on 2026-04-14, marks Sonnet and Opus 4 as deprecated and changes the Bedrock Mantle client to use an auth header. Deprecating two Claude 4 models signals a shift in supported model tiers, while the Bedrock auth change affects how clients authenticate in production integrations.

v0.94.1, released on 2026-04-13, is a patch update from v0.94.0 that fixes streaming by adding missing events. The change is narrow but important because missing stream events can break real-time outputs or downstream consumers relying on complete event sequences.

v0.94.0, released on 2026-04-10, adds support for the Vertex EU region and includes bug fixes plus documentation/example updates. The main technical change is ensuring file data are sent as a single parameter, which should improve request handling consistency.

v0.93.0, released on 2026-04-09, adds a beta advisor tool to the API. The change is notable because it expands the API surface with a new guidance-oriented capability, and the full changelog links v0.92.0 to v0.93.0.

Version 2.31.0 (2026-04-08) adds a `phase` field to conversation messages, support for short-lived tokens, raw data over websockets, and a new indices array format for query/form serialization, alongside API/docs updates and one client bug fix. A notable change is that `web_search_call.results` was briefly added to `ResponseIncludable` and then removed in the same release, suggesting an API adjustment during the rollout.

Version 2.30.0, released 2026-03-25, adds a `keys` field to `Click`, `DoubleClick`, `Drag`, `Move`, and `Scroll` computer actions, aligns SDK response types with expanded item schemas, sanitizes endpoint path params, and makes `type` required in `ResponseInputMessageItem`. The release also switches tests from Prism to Steady and bumps Steady through v0.19.7, which suggests a broader test harness migration alongside the API/type updates.

v2.29.0, released on 2026-03-17, adds 5.4 nano and mini model slugs, a `/v1/videos` endpoint in batches create, a `defer_loading` field on `ToolFunction`, and `in`/`nin` operators for `ComparisonFilter`. It also includes dependency and Pydantic fixes, with a minimum `typing-extensions` bump and a change to avoid passing `by_alias` unless set.

v2.28.0, released on 2026-03-13, adds API support for custom voices in the changelog from v2.27.0 to v2.28.0. The new feature matters because it lets developers define or integrate personalized voice outputs directly through the API.