PyPI · #194 most downloaded on PyPI

anthropic

1.11.0147M downloads/moanthropics/anthropic-sdk-python ↗New releases in your daily digest, changelog included.

The official Python library for the anthropic API

Last release 4 days ago
30 Sep 2026
Ships on a steady schedule
a new release about every 1 weeks
Nearly every release is documented
notes for 60 of the last 60 stable releases
Nothing withdrawn
no release was ever pulled
4 years old
223 releases · first in 2023

Release timeline

223 releases since 2023

2023202420252026

20232026

One column per quarter.

Releases

1.11.030 Sept 20262 sources agree
api: add list spend limits endpoint
1.11.0 (2026-09-30)

Full Changelog: v1.10.0...v1.11.0

Features

api: add list spend limits endpoint (e8f0cac)

Chores

client: deprecate sonnet 4.5 (22b36b1)
Open source →
1.10.030 Sept 20262 sources agree
api: add a refusal stop reason and stop_details to Managed Agents session idle events
1.10.0 (2026-09-30)

Full Changelog: v1.9.0...v1.10.0

Features

api: add a refusal stop reason and stop_details to Managed Agents session idle events (cba653f)

api: add Claude Enterprise analytics, spend limits, and RBAC groups and roles to the Admin API (6bb2c0c)

api: add per-user usage and cost reports to the Admin API analytics (7443920)

api: add Plugins and Plugin Marketplaces to the Admin API (1baad3b)

api: add repository error types to Managed Agents session errors (c682f7e)

api: allow removing a plugin's org-wide installation setting (17f52fc)

api: MCP tunnels beta: add read-only transport object to Tunnel and return the one-time relay token in the create response (88718ff)

api: Organization API endpoints are now GA (f1d195a)

Bug Fixes

api: make memory store description, metadata, archived_at required (6cc39d3)

api: type admin plugin preference and marketplace fields as enums (b4dfd99)

credentials: refuse config files that group or others can write (cd5fc6a)

pagination: auto-paging continues past an empty page while next_page is set (c027a26)

tools: stop the session tool runner after any idle that ends the turn (#969) (9c60a53)

Chores

api: update MCP Tunnels types and descriptions (aa49ba7)

ci: run tests on the oldest and newest Python in parallel (53bb298)

docs: remove placeholder enum descriptions (f535d67)

internal: format request options with one argument per line (4e2463e)

tests: match mocked binary routes when a request adds query params (0781470)

1.9.028 Sept 20262 sources agree

api: add between_tools thinking type

1.9.0 (2026-09-28)

Full Changelog: v1.8.0...v1.9.0

Features

api: add between_tools thinking type (a9a577d)
api: add claude-sonnet-5-5 (a5a25e9)
api: add include_inherited and source to workspace rate limits (0bf4af8)
api: add typed event type values to the Managed Agents events list filter (1b82cd9)
api: cache diagnostics GA — diagnostics on Message / MessageCreateParams (22062b8)
tools: optionally run tool calls while the reply streams (26d0812)

Bug Fixes

client: send no placeholder filename for unnamed file uploads (9e9709d)
helpers: degrade between_tools thinking to disabled on fallback hops (#952) (a3834d4)
messages: accept diagnostics in stream() and parse() (#929) (fad840c)

Chores

api: list the known model ids first in the Model types (e5a082a)
ci: choose the CI runner by repository (39ccf62)
client: stop sending beta header from parse and tool runner (#907) (1428100)
docs: clarify that stream: true returns the raw event stream (82918fa)
docs: make Managed Agents actor descriptions resource-neutral (34ef524)
docs: restore the research-preview notice on the Dream type (f03e32e)

Documentation

add field docstring spacing rule to CLAUDE.md (e5c35f4)
api: prefer each field's own description over its shared type's (d79a2e7)
claude.md: add function body spacing rule (3174f8f)
list importable type names in api.md (56a42ab)

Open source →

1.8.022 Sept 20262 sources agree

api: add support for claude-opus-5-5, inline tool definitions and MCP tool-list pinning (beta)

1.8.0 (2026-09-22)

Full Changelog: v1.7.0...v1.8.0

Features

api: add support for claude-opus-5-5, inline tool definitions and MCP tool-list pinning (beta) (b5cc700)

Bug Fixes

api: share one evaluated_permission enum across Managed Agents events (f4f51c8)
streaming: avoid a Python 3.13 crash at exit when a stream is left open (af029bd)
tools: add_tools() takes effect straight away (#874) (06d0a6b)
tools: leave reply-only params off the tool runner's compaction request (#871) (4687310)

Chores

docs: add descriptions to the Dreams API reference (5574c63)
docs: add descriptions to the User Profiles API reference (5574c63)
docs: add memory store descriptions to the Managed Agents API reference (5574c63)
docs: improve descriptions in the Dreams API reference (1f5e477)
docs: simplify the session thread agent type description (a45b7ec)
docs: update diagnostics field descriptions on beta messages (367750c)
internal: fix tests (70c8cbd)
internal: remove mypy (be01ed6)
tests: update fixtures (77f6df8)

Documentation

add path and header parameter descriptions (f429a30)

Refactors

client: remove the request param transform in favour of the JSON encoder (539422c)

Open source →

1.7.018 Sept 2026Deprecated2 sources agree

api: add group with display_name to rate limits, deprecate group_type

1.7.0 (2026-09-18)

Full Changelog: v1.6.0...v1.7.0

Features

api: add group with display_name to rate limits, deprecate group_type (28f0a83)
tools: add compact_before_next_turn() to the tool runner (#641) (8b23fb3)

Bug Fixes

bedrock: raise an API error for eventstream exception and error frames (#769) (8ec9cc9)
client: accept X | Y union types when parsing responses (b366fa5)
client: don't raise TypeError for X | Y fields with unknown data (30ebd69)
client: join multiple anthropic-beta values with a comma and no space (#781) (1680324)
tools: tidy compact_before_next_turn() state and failure handling (#804) (d3a9fc8)

Chores

deps: require pydantic 1.10 or later (91931e1)
docs: add descriptions for enum values and path parameters (99184dc)
docs: clarify the compaction tool_changes and tool change descriptions (eacc0ff)
internal: add more unnecessary cast comments (9e6ce27)
internal: pass strict= to zip() in the MCP tool helpers (13cfe64)
internal: remove an unused noqa comment from the model tests (2c18298)
internal: set ruff's target version to Python 3.10 (2bdfd41)

Open source →

1.6.015 Sept 20262 sources agree

api: add auto mode tool permissions for Managed Agents

1.6.0 (2026-09-15)

Full Changelog: v1.5.0...v1.6.0

Features

api: add auto mode tool permissions for Managed Agents (909d92f)
api: add compaction parameter and signed compaction blocks (beta) (8689179)
api: add enum types for workspace data-residency geo fields (3dc6dbf)
api: add thinking_mismatch_allowed entries to input_transformations (beta) (14d1792)
api: add url_sources to the web fetch tool (4ba7115)
api: add workspace_id parameter to user profiles methods (1c359b2)
client: support async credential token providers (95e93f7)

Bug Fixes

api: mark usage iteration model as nullable (520d000)
api: use one input transformation type for message and delta event (ae86d7d)
client: honor Retry-After values above 60 seconds (2d03ba2)
client: ignore invalid Retry-After values and validate maxRetries (909d92f)
client: retry connection errors in the async client and stop blocking in the coroutine retry loop (909d92f)
client: use the default backoff when Retry-After is out of range (3d15f04)

Chores

deps: bump aiohttp, pygments and pytest in the dev lockfile (005ad11)
deps: require anyio 4.1 or later (79b4175)
docs: clarify that session_thread_id on tool use events is informational (2ac7b60)
docs: correct the compaction beta's parameter descriptions (5048c9a)
internal: sort the imports in beta_message.py (0a92f91)
tests: define the model tests' type alias at module level (98c3a7a)
tests: stop the mock server without failing a passing test run (d28aea7)

Documentation

api: clarify usage.iterations entry typing under server-side fallback (bb06629)
stop documenting unions with their first variant's description (7a94250)
use markdown formatting in most docstrings (25f344f)

Open source →

1.5.010 Sept 2026Deprecated2 sources agree

client: keep the idempotency_key request option as a deprecated no-op

1.5.0 (2026-09-10)

Full Changelog: v1.4.0...v1.5.0

Features

api: add auto mode tool permissions for Managed Agents (62aa21b)
api: add content_too_large web_fetch tool error code (4b5dec6)
api: add the user-profiles-2026-09-04 beta value and external_user_details to user profiles (5f881a5)
api: support mounting public GitHub repositories without an authorization_token in Managed Agents sessions (285937c)
client: add Message.to_param() and BetaMessage.to_param() (192a2b2)
credentials: add CredentialsError and IdentityTokenFileError (9acd79f)
tools: accept tool objects directly in messages.create, parse, stream and count_tokens (ebd2fc5)

Bug Fixes

client: merge extra_body before client hooks run (7aaf887)
credentials: refuse credentials files accessible by group or others (7af3e2b)
streaming: keep partial tool input JSON off content blocks (4605bca)
types: leave parsed_output out of dumped text blocks (ca0706d)

Chores

client: clean up the unused idempotency request option (c97830c)
client: keep the idempotency_key request option as a deprecated no-op (#621) (c2ab92e)
docs: correct the environment scope field description (b903ee0)
internal: remove generated file header comments (ae671f8)
internal: restore package version (f3aefc7)
internal: restore package version (e3c70e8)
internal: stop stamping the package version into generated files (e7a6a28)
tests: restore empty test package marker files (0803af0)

Open source →

1.4.04 Sept 20262 sources agree

api: add Claude Tag category and user breakdowns to usage reports

1.4.0 (2026-09-04)

Full Changelog: v1.3.0...v1.4.0

Features

api: add Claude Tag category and user breakdowns to usage reports (9fce1e4)
api: add named types for organization compliance settings state (1de1957)
api: add support for sending a workspace ID on more endpoints (d1d2c01)

Bug Fixes

client: raise a clear error when an httpx object is passed instead of an httpx2 one (9447099)
repair custom-code merge in messages resources (#580) (85454ca)

Chores

examples: refresh platform model IDs (#499) (182abb5)
internal: bundle the mock server spec and update dev tooling (f9b0cf2)
internal: clean up code comments (#578) (d202327)
internal: fix mypy unreachable error in detect-breaking-changes script (07834f6)
internal: narrower codeowners scope (daca8f1)
internal: revert codeowners change (41aa767)
tests: remove stale warning filters (ba9bf35)
tests: reword the skip reason on the path-level query param tests (6b5046a)

Documentation

api: update a few doc strings (26c509d)

Open source →

1.3.01 Sept 20262 sources agree

api: beta user profiles: add external_user_onboarded_at, remove relationship in favor of access_type

1.3.0 (2026-09-01)

Full Changelog: v1.2.0...v1.3.0

Features

api: beta user profiles: add external_user_onboarded_at, remove relationship in favor of access_type (74080c3)
api: manual updates (1dc3ce0)
api: organization compliance settings, user-profile order_by, memory-store and toolset schema updates (429e719)

Bug Fixes

aws: resolve base_url from aws_region under skip_auth and with_options (#564) (b6d1732)
batches: add results to GA raw/streaming response wrappers (cbf9715)
ci: don't hard-wrap detect-breaking-changes output (b5be779)
client: derive multipart filename for file tuples passed without one (a9f3fb4)
types: remove unused wire aliases from header and path params (dc0a9ab)

Chores

internal: drop the unused discriminator argument from PropertyInfo (3dae6fd)
internal: drop the unused distro dependency (a47d85f)

Documentation

changelog: detail the beta files/skills GA-shape change (#1900) (7c84e13)

Refactors

types: mark discriminated unions with UnionDiscriminator instead of PropertyInfo (17df0bf)
types: use UnionDiscriminator for more discriminated unions (b44af2c)

Open source →

1.2.027 Aug 2026

api: beta files/skills namespaces use GA shapes; drop dated beta header pins

1.2.0 (2026-08-27)

Full Changelog: v1.1.0...v1.2.0

Features

api: beta files/skills namespaces use GA shapes; drop dated beta header pins (9df4565)

Bug Fixes

aws,bedrock: sign raw request bytes so binary file uploads work (#531) (f50e910)
ci: resolve assignment aliases in detect-breaking-changes (f2c4925)
sessions: make event accumulator forward-compatible with new event types (#533) (cbbaf6e)
tools: let read return a view_range of a file over the size cap (#538) (b68e876)
tools: preserve exact file bytes in the agent toolset and memory tool (no newline translation) (#540) (56921a8)
webhooks: require headers to be passed to unwrap() (0baa902)

Documentation

api: clarify pagination on the organization rate-limit list endpoints (1832b27)

Open source →

Additional notes

Full Changelog: v1.1.0...v1.2.0

Features

api: beta files/skills namespaces use GA shapes; drop dated beta header pins (9df4565)

The beta Files and Skills namespaces (client.beta.files, client.beta.skills) no longer send the files-api-2025-04-14 / skills-2025-10-02 headers and return the same shapes as client.files / client.skills (with Beta-prefixed type names under anthropic.types.beta). Requests that still send those headers on raw HTTP keep receiving the beta shapes.

Changes in the beta namespaces:
- client.beta.skills.delete() now deletes a Skill together with all of its versions (previously refused while any version existed). It returns BetaDeletedSkill (was SkillDeleteResponse).
- Beta Messages type BetaSkill (container skill reference with skill_id, type, version) is renamed BetaContainerSkill; the request-side BetaSkillParams keeps its name. BetaSkill now names the Skill object returned by client.beta.skills.create() / retrieve() / list() (replacing SkillCreateResponse / SkillRetrieveResponse / SkillListResponse), and skill versions are BetaSkillVersion / BetaDeletedSkillVersion (replacing Version*Response).
- client.beta.files.list() returns SyncPageCursor[BetaFileMetadata] / AsyncPageCursor[BetaFileMetadata] (with data / next_page) and paginates with page= / ids= (was SyncPage / AsyncPage with data, has_more, first_id, last_id and before_id= / after_id=); iterating the result for auto-pagination is unchanged. BetaSkill uses display_name (was display_title, also the create() keyword) and latest_version_id (was latest_version), and BetaSkillVersion is addressed by its skver_… id (the Unix-timestamp version field is gone).
Migration guides: Migrate from files-api-2025-04-14 · Migrate from skills-2025-10-02

Bug Fixes

aws,bedrock: sign raw request bytes so binary file uploads work (#531) (f50e910)
ci: resolve assignment aliases in detect-breaking-changes (f2c4925)
sessions: make event accumulator forward-compatible with new event types (#533) (cbbaf6e)
tools: let read return a view_range of a file over the size cap (#538) (b68e876)
tools: preserve exact file bytes in the agent toolset and memory tool (no newline translation) (#540) (56921a8)
webhooks: require headers to be passed to unwrap() (0baa902)

Documentation

api: clarify pagination on the organization rate-limit list endpoints (1832b27)

1.1.026 Aug 20262 sources agree

api: add updates thinking display mode (beta)

1.1.0 (2026-08-26)

Full Changelog: v1.0.0...v1.1.0

Features

api: add updates thinking display mode (beta) (eb4a73f)
api: add missing anthropic-beta values (dbebd15)
api: add support for Organization API endpoints (5a5b8fc)

Bug Fixes

docs: correct link for long requests error (#1884) (4474f31), closes #1883
tools: keep the tool runner going on pause_turn (#343) (ab1ec60)

Chores

docs: clarify skill version latest support and memory version retention (a754f3b)
internal: cancel superseded CI runs (c061ab1)
internal: minor workflow reformat (1569002)
internal: remove the legacy response API (a48b1dd)
internal: use import httpx2 directly instead of aliasing as httpx (628d789)

Documentation

api: clarify session thread agent and usage.iterations compaction descriptions (beta) (4ace503)

Open source →

1.0.020 Aug 2026Breaking2 sources agree

client: upgrade to httpx2 and some minor breaking changes. See MIGRATION.md for details

1.0.0 (2026-08-20)

Full Changelog: v0.125.0...v1.0.0

⚠ BREAKING CHANGES

client: upgrade to httpx2 and some minor breaking changes. See MIGRATION.md for details

Features

client: upgrade to httpx2 and some minor breaking changes. See MIGRATION.md for details (33e2967)

Bug Fixes

beta: stop warning about output_format= on the parse/stream/tool_runner helpers (59bf261)

Chores

streaming: restore the original event imports in lib/streaming/_types.py (87e9e01)

Documentation

examples: use adaptive thinking in thinking examples (b5870af)

Open source →

0.125.019 Aug 20262 sources agree

api: managed agents web search config and self hosted sandbox memory

0.125.0 (2026-08-19)

Full Changelog: v0.124.0...v0.125.0

Features

api: managed agents web search config and self hosted sandbox memory (b75afd6)

Open source →

0.124.019 Aug 20262 sources agree

api: Files and Skills APIs are now GA; add computer use and browser use toolsets

0.124.0 (2026-08-19)

Full Changelog: v0.123.0...v0.124.0

Features

api: Files and Skills APIs are now GA; add computer use and browser use toolsets (9a09e84)

Open source →

0.123.019 Aug 20262 sources agree

api: additions to files and memory stores

0.123.0 (2026-08-18)

Full Changelog: v0.122.0...v0.123.0

Features

api: additions to files and memory stores (09ce187)
api: updates to skill, files, and user profiles (c6cbffd)
client: add helpers for accessing the workspace ID in response headers (f79882b)

Bug Fixes

api: remove unsupported mid_conv_system content block (6f15b8d)
client: compute platform headers without spawning a subprocess (baca9f4)
client: export custom status errors from _exceptions.all (#459) (2950ec4)
client: export ServiceUnavailableError and DeadlineExceededError from the package root (#468) (0dcd06d)
session-runner: retry tool-result sends for at least the lease TTL (#453) (e1a4891)
tools: run synchronous session tools in a worker thread (#399) (8f88c57)

Chores

examples: remove legacy Text Completions API examples (cf5c768)
internal: remove leftover prism references (826ba7a)

Open source →

0.122.013 Aug 20262 sources agree

api: add output_behavior to dream creation (create a new memory store or update the input store in place)

0.122.0 (2026-08-13)

Full Changelog: v0.121.0...v0.122.0

Features

api: add output_behavior to dream creation (create a new memory store or update the input store in place) (852c4bb)

Bug Fixes

bedrock,aws: run SigV4 signing off the event loop in async clients (#334) (2bae6c8)
bedrock: expose beta.messages.parse, stream and tool_runner (#366) (6eca7bb)
client: add models (52e9d94)
client: keep token exchange bound per client across copy() (#388) (c13e6e3)
client: read PathLike contents passed inside a file tuple (070f953)
client: treat empty ANTHROPIC_API_KEY / ANTHROPIC_AUTH_TOKEN as unset (#341) (76a2e68)
streaming: add context to malformed tool input JSON errors in the non-beta accumulator (#339) (a343e17)
streaming: apply all message_delta fields when accumulating streamed messages (#380) (fc1599b)
streaming: emit input_json events for server tool use blocks (#336) (ccfc8e1)
streaming: keep omitted content block fields unset in accumulated messages (#346) (cd40aab)
streaming: run the request transform once in messages.stream() (#347) (81a92da)
streaming: silence pydantic serializer warnings on message_stop events (#338) (41f9cdc)
tools: reject symlink loops in tool paths and skip special skill-archive members (#322) (43e8669)
vertex: expose beta.messages.parse and tool_runner (#367) (96723a0)

Chores

ci: run breaking-change detection as a ci.yml job on every push (6dfd16e)
examples: update messages_stream.py shebang from rye to uv (#1519) (7d72364)
internal: codegen related update (21a0e3d)
internal: drop remaining references to black (13df390)
internal: remove misc things (d6ee99e)
tests: use pytest monkeypatch and fakes instead of unittest.mock (55d246f)
tests: use pytest monkeypatch instead of unittest.mock (e0c6488)

Documentation

api: clarify that user profile name is optional for resold profiles (b8f9f61)
fix fulfillment typos in session runner (#1795) (009b035)
fix incorrect docstring in AsyncAnthropicFoundry.models (#1592) (f1f5e9b)

Refactors

use the not_given singleton instead of the legacy NOT_GIVEN alias (eeb4d74)

Open source →

0.121.07 Aug 20262 sources agree

api: add mid-conversation-tool-changes-2026-07-01 beta

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 strings (3a5dd69)
ensure all dependencies have major version constraints (#274) (d52999b)

Open source →

0.120.228 Jul 20262 sources agree

mcp: support mcp sdk v2 alongside v1

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)

Open source →

0.120.128 Jul 20262 sources agree

0.120.1 (2026-07-28) Full Changelog: v0.120.0...v0.120.1 Bug Fixes mcp: pin mcp extra to <2

0.120.1 (2026-07-28)

Full Changelog: v0.120.0...v0.120.1

Bug Fixes

mcp: pin mcp extra to <2 (#1783) (fb66371)

Open source →

0.120.024 Jul 20262 sources agree

api: add tool addition/removal blocks and tool_change events

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)

Open source →

0.119.023 Jul 20262 sources agree

api: add new stop reason 'model_context_window_exceeded'

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)

Open source →

0.118.022 Jul 20262 sources agree

api: add support for Managed Agents model effort, initial session events, and threads delta streaming

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)

Open source →

0.117.121 Jul 20262 sources agree

aws: handle credentials correctly when using AnthropicAWS.copy()

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)
internal: codegen related update (a4fbecf)

Open source →

0.117.016 Jul 20262 sources agree

api: add support for MCP Tunnels

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)

Open source →

0.116.02 Jul 20262 sources agree

api: add agent-memory-2026-07-22 beta header

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)

Open source →

0.115.11 Jul 20262 sources agree

api: remove some nonfunctional types from the SDKs

0.115.1 (2026-07-01)

Full Changelog: v0.115.0...v0.115.1

Chores

api: remove some nonfunctional types from the SDKs (5e7c431)

Open source →

0.115.030 Jun 20262 sources agree

api: add support for Managed Agents event delta streaming, agent overrides, reverse pagination, vault credential injection scoping, and agent and depl

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)

Open source →

0.114.030 Jun 20262 sources agree

api: add support for claude-sonnet-5

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)

Open source →

0.113.029 Jun 20262 sources agree

api: add support for 20260318 web fetch and support tools

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)

Open source →

0.112.024 Jun 20262 sources agree

client: add support for system.message streaming events

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)

Open source →

0.111.018 Jun 20262 sources agree

helpers: tag refusal-fallback middleware requests with fallback-refusal-middleware

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)

Open source →

0.110.018 Jun 20262 sources agree

api: add support for new code_execution_20260120 tool

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)

Open source →

0.109.215 Jun 20262 sources agree

api: remove retired models from API and SDKs

0.109.2 (2026-06-15)

Full Changelog: v0.109.1...v0.109.2

Chores

api: remove retired models from API and SDKs (d4bcfcc)

Open source →

0.109.19 Jun 20262 sources agree

api: add frontier_llm refusal category

0.109.1 (2026-06-09)

Full Changelog: v0.109.0...v0.109.1

Bug Fixes

api: add frontier_llm refusal category (d3a806b)

Open source →

0.109.09 Jun 20262 sources agree

api: add support for Managed Agents deployments and environment variable credentials

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)

Open source →

0.108.09 Jun 20262 sources agree

api: add support for claude-mythos-5 and claude-fable-5, with support for server-side fallbacks on refusal

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)

Open source →

0.107.17 Jun 20262 sources agree

foundry: send x-api-key header for API-key auth (#62) (1338141), closes #1661

0.107.1 (2026-06-07)

Full Changelog: v0.107.0...v0.107.1

Bug Fixes

foundry: send x-api-key header for API-key auth (#62) (1338141), closes #1661

Open source →

0.107.06 Jun 20262 sources agree

api: small updates to Managed Agents types

0.107.0 (2026-06-06)

Full Changelog: v0.106.0...v0.107.0

Features

api: small updates to Managed Agents types (72923f9)

Open source →

0.106.05 Jun 2026Deprecated2 sources agree

api: mark Claude Opus 4.1 as deprecated

0.106.0 (2026-06-05)

Full Changelog: v0.105.2...v0.106.0

Features

api: mark Claude Opus 4.1 as deprecated (85068cc)

Bug Fixes

client: make Foundry client copy() and with_options() work (94146ac)
transform schema: preserve $defs when schema root is a $ref (#1642) (fc58e06)

Chores

internal: fix artifact url (a6ed0c4)
internal: fix branch names (3b03370)
internal: update private repo name (7dbcb05)

Documentation

point security reports to Anthropic's HackerOne program (#10) (80f2c97)

Open source →

0.105.229 May 20262 sources agree

## 0.105.2 (2026-05-29) Full Changelog: v0.105.1...v0.105.2

0.105.2 (2026-05-29)

Full Changelog: v0.105.1...v0.105.2

Open source →

0.105.028 May 20262 sources agree

api: Add support for claude-opus-4-8, mid-conversation system blocks, and usage.output_tokens_details

0.105.0 (2026-05-28)

Full Changelog: v0.104.1...v0.105.0

Features

api: Add support for claude-opus-4-8, mid-conversation system blocks, and usage.output_tokens_details (f18b014)
support custom file size caps (#1825) (7e5f944)

Chores

examples: rename managed-agents private-sandbox-worker to self-hosted-sandbox-worker (#1822) (750f956)

Documentation

replace literal newlines (8f7f6c0)

Open source →

0.104.122 May 20262 sources agree

streaming: carry encrypted_content through beta compaction accumulator

0.104.1 (2026-05-21)

Full Changelog: v0.104.0...v0.104.1

Bug Fixes

streaming: carry encrypted_content through beta compaction accumulator (#1821) (f7a720c)

Open source →

0.104.021 May 20262 sources agree

api: Add support for thinking-token-count beta for estimated tokens in thinking block deltas when streaming

0.104.0 (2026-05-21)

Full Changelog: v0.103.1...v0.104.0

Features

api: Add support for thinking-token-count beta for estimated tokens in thinking block deltas when streaming (80d0fdf)

Open source →

0.103.119 May 20262 sources agree

runner: skip tool calls SessionToolRunner does not own

0.103.1 (2026-05-19)

Full Changelog: v0.103.0...v0.103.1

Bug Fixes

runner: skip tool calls SessionToolRunner does not own (#1817) (9425c6a)

Open source →

0.103.019 May 20262 sources agree

client: Add support for self-hosted sandboxes in CMA with sandbox helpers

0.103.0 (2026-05-19)

Full Changelog: v0.102.0...v0.103.0

Features

client: Add support for self-hosted sandboxes in CMA with sandbox helpers (e5625b0)

Open source →

0.102.013 May 20262 sources agree

api: Add BetaManagedAgentsSearchResultBlock types

0.102.0 (2026-05-13)

Full Changelog: v0.101.0...v0.102.0

Features

api: Add BetaManagedAgentsSearchResultBlock types (3681f10)
api: Add support for cache diagnostics beta (db51c6c)
internal/types: support eagerly validating pydantic iterators (68dabb0)

Chores

api: spec updates (d579133)

Open source →

0.101.011 May 20262 sources agree

aws: Add AWS client for Claude Platform on AWS

0.101.0 (2026-05-11)

Full Changelog: v0.100.0...v0.101.0

Features

aws: Add AWS client for Claude Platform on AWS (1e70e3a)

Bug Fixes

client: add missing f-string prefix in file type error message (06d109a)

Chores

examples: bump tools_runner.py to claude-sonnet-4-5-20250929 (#1473) (1aa8e41)
examples: update shebang from poetry to uv (#1497) (ace8f38)

Open source →

0.100.06 May 20262 sources agree

api: add support for Managed Agents multiagents and outcomes, webhooks, vault validation

0.100.0 (2026-05-06)

Full Changelog: v0.99.0...v0.100.0

Features

api: add support for Managed Agents multiagents and outcomes, webhooks, vault validation (3b3deee)

Bug Fixes

api: Adjust webhook configuration (8c3339e)

Open source →

0.99.05 May 20262 sources agree

client: allow targeting a workspace for OIDC federation token exchange

0.99.0 (2026-05-05)

Full Changelog: v0.98.1...v0.99.0

Features

client: allow targeting a workspace for OIDC federation token exchange (4ba8067)

Open source →

0.98.14 May 20262 sources agree

## 0.98.1 (2026-05-04) Full Changelog: v0.98.0...v0.98.1 ### Chores * fix typo in example

0.98.1 (2026-05-04)

Full Changelog: v0.98.0...v0.98.1

Chores

fix typo in example (#1754) (de8ba13)

Open source →

0.98.04 May 20262 sources agree

api: improve Managed Agents APIs

0.98.0 (2026-05-04)

Full Changelog: v0.97.0...v0.98.0

Features

api: improve Managed Agents APIs (7faf393)
client: add Workload Identity Federation, interactive OAuth, and auth profiles (6458bcc)
support setting headers via env (52eb8cd)

Bug Fixes

streaming: propagate stop_details from message_delta onto accumulated Message (#1725) (900dd9b)
use correct field name format for multipart file arrays (8350bdc)
vertex: async client missing us/eu multi-region base_url branches (#1734) (3e78f71)

Chores

internal: reformat pyproject.toml (5a9d5fd)

Open source →

0.97.023 Apr 20262 sources agree

client: optimize file structure copying in multipart requests

0.97.0 (2026-04-23)

Full Changelog: v0.96.0...v0.97.0

Features

api: CMA Memory public beta (fc30ebe)

Bug Fixes

api: fix errors in api spec (f946de8)
api: restore missing features (72212ab)

Performance Improvements

client: optimize file structure copying in multipart requests (1f9eed3)

Chores

add missing import (4b12f5e)
internal: more robust bootstrap script (7ed7370)
tests: bump steady to v0.22.1 (a4b7184)

Open source →

0.96.016 Apr 20262 sources agree

api: add claude-opus-4-7, token budgets and user_profiles

0.96.0 (2026-04-16)

Full Changelog: v0.95.0...v0.96.0

Features

api: add claude-opus-4-7, token budgets and user_profiles (0aa2a0d)

Chores

ci: remove release-doctor workflow (1d9add3)

Open source →

0.95.014 Apr 2026Deprecated2 sources agree

api: mark Sonnet and Opus 4 as deprecated

0.95.0 (2026-04-14)

Full Changelog: v0.94.1...v0.95.0

Features

api: mark Sonnet and Opus 4 as deprecated (0c1e773)
bedrock: use auth header for mantle client (#1644) (3b93090)

Open source →

0.94.113 Apr 20262 sources agree

## 0.94.1 (2026-04-13) Full Changelog: v0.94.0...v0.94.1 ### Bug Fixes * streaming: add missing events

0.94.1 (2026-04-13)

Full Changelog: v0.94.0...v0.94.1

Bug Fixes

streaming: add missing events (c6a06d8)

Open source →

0.94.010 Apr 20262 sources agree

ensure file data are only sent as 1 parameter

0.94.0 (2026-04-10)

Full Changelog: v0.93.0...v0.94.0

Features

vertex eu region (#1658) (b7e157d)

Bug Fixes

ensure file data are only sent as 1 parameter (837b25b)

Documentation

improve examples (48089fd)
update examples (0f3c28b)

Open source →

0.93.09 Apr 20262 sources agree

## 0.93.0 (2026-04-09) Full Changelog: v0.92.0...v0.93.0 ### Features * api: Add beta advisor tool

0.93.0 (2026-04-09)

Full Changelog: v0.92.0...v0.93.0

Features

api: Add beta advisor tool (4297dca)

Open source →

0.92.08 Apr 20262 sources agree

api: add support for Claude Managed Agents

0.92.0 (2026-04-08)

Full Changelog: v0.91.0...v0.92.0

Features

api: add support for Claude Managed Agents (5b879a7)

Open source →

0.91.07 Apr 20262 sources agree

client: Create Bedrock Mantle client

0.91.0 (2026-04-07)

Full Changelog: v0.90.0...v0.91.0

Features

client: Create Bedrock Mantle client (#1616) (fd195a2)

Open source →

0.90.07 Apr 20262 sources agree

api: Add support for claude-mythos-preview

0.90.0 (2026-04-07)

Full Changelog: v0.89.0...v0.90.0

Features

api: Add support for claude-mythos-preview (fc7ddd8)

Bug Fixes

client: preserve hardcoded query params when merging with user params (32d35e0)

Open source →

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anthropic

Release timeline

Releases

1.11.0 (2026-09-30)

Features

Chores

1.10.0 (2026-09-30)

Features

Bug Fixes

Chores

1.9.0 (2026-09-28)

Features

Bug Fixes

Chores

Documentation

1.8.0 (2026-09-22)

Features

Bug Fixes

Chores

Documentation

Refactors

1.7.0 (2026-09-18)

Features

Bug Fixes

Chores

1.6.0 (2026-09-15)

Features

Bug Fixes

Chores

Documentation

1.5.0 (2026-09-10)

Features

Bug Fixes

Chores

1.4.0 (2026-09-04)

Features

Bug Fixes

Chores

Documentation

1.3.0 (2026-09-01)

Features

Bug Fixes

Chores

Documentation

Refactors

1.2.0 (2026-08-27)

Features

Bug Fixes

Documentation

Features

Bug Fixes

Documentation

1.1.0 (2026-08-26)

Features

Bug Fixes

Chores

Documentation

1.0.0 (2026-08-20)

⚠ BREAKING CHANGES

Features

Bug Fixes

Chores

Documentation

0.125.0 (2026-08-19)

Features

0.124.0 (2026-08-19)

Features

0.123.0 (2026-08-18)

Features

Bug Fixes

Chores

0.122.0 (2026-08-13)

Features

Bug Fixes

Chores

Documentation

Refactors

0.121.0 (2026-08-07)

Features

Chores