Go modules · #1636 by repository stars

github.com/anthropics/anthropic-sdk-go

v1.79.1anthropics/anthropic-sdk-go ↗New releases in your daily digest, changelog included.

Last release today
08 Oct 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Nothing withdrawn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
2 years old
251 releases · first in 2024

Release timeline

251 releases since 2024

202420252026

2024

Releases

v1.79.18 Oct 20263 sources agree
ci: check that pull requests update the changelog
Chores

ci: check that pull requests update the changelog

docs: note that listing Claude Console spend limits is in early access
Open source →
v1.79.07 Oct 2026Deprecated3 sources agree
api: add display_name to RBAC roles and deprecate name
1.79.0 (2026-10-07)

Full Changelog: v1.78.0...v1.79.0

Features

api: add claude-haiku-5-5 and typed computer and browser toolset tool calls (1930a5e)

api: add disabled to thinking types in model capabilities (3b88a46)

api: add display_name to RBAC roles and deprecate name (e568369)

api: add include_default parameter to list workspaces (a2acfc6)

api: add lifecycle stage fields and filter to /v1/models (2b3ea06)

api: add line to model objects (24b1d56)

api: add url_sources to the Managed Agents web_fetch tool config (3b88a46)

api: add web search and code execution support to model capabilities (3b88a46)

client: add All() iterators to SSE streams and auto-pagers (b0d7423)

Bug Fixes

api: send the beta header by default when listing spend limits (b8bcfc7)

auth: require https or loopback at every token endpoint (#431) (3b88a46)

client: percent-encode path params and reject dot-segment values (3b88a46)

client: return the field error when a param union variant fails to decode (a59fef2)

client: send array header params as a single comma-separated header (dace66e)

client: send default and caller-provided array header values in a single header (1ca109c)

environments: keep a local edit made after a memory upload whose response was lost (#441) (3b88a46)

return unmodeled content blocks and citations from ToParam instead of panicking (#436) (3b88a46)

Chores

api: keep the MessageParam name and drop generated constructors (3b88a46)

api: mark the Text Completions API as deprecated (3b88a46)

docs: correct example groups in rate limit list description (a489eb3)

docs: correct when usage and cost report data becomes final (3b88a46)

docs: describe a federation rule's target by its type (3b88a46)

docs: fix example IDs in sessions, agents and vault credentials (3b88a46)

docs: update Managed Agents multiagent and thread descriptions (3b88a46)

docs: update the activity summaries endpoint description (86f2da1)

docs: update the description of the Model line field (ad2ed3e)

internal: add REVIEW.md with review instructions (3b88a46)

internal: make mock server spec updates smaller in git history (3b88a46)

internal: move the custom unmarshaler test into the param decode tests (#444) (3b88a46)

tests: run tests skipped for a query param bug that is now fixed (3a8025b)

tests: run tests that an older mock server could not serve (4735a5a)

Documentation

api: list streaming-only methods in api.md under their real names (3b88a46)

api: state the agent tools limit as 256 (cfd31a5)

beta: point structured-output helper docs at output_config.format (#429) (3b88a46)

client: remove outdated param.Field note from Execute (fce1d47)

One column per month.

v1.78.1-0.20261007173418-a59fef29a2607 Oct 2026pre-release

Nothing published for this version

v1.78.030 Sept 2026Deprecated3 sources agree

api: mark Claude Sonnet 4.5 as deprecated (end-of-life November 30, 2026)

1.78.0 (2026-09-30)

Full Changelog: v1.77.0...v1.78.0

Features

api: add list spend limits endpoint (597ed95)

Chores

api: mark Claude Sonnet 4.5 as deprecated (end-of-life November 30, 2026) (5464a3e)

Open source →

v1.77.1-0.20260930224905-1e8c4aaf7daa30 Sept 2026pre-release

Nothing published for this version

v1.77.030 Sept 20263 sources agree

analytics: keep the per-user report actor a union

1.77.0 (2026-09-30)

Full Changelog: v1.76.0...v1.77.0

Features

analytics: keep the per-user report actor a union (#416) (03b3feb)
api: add a refusal stop reason and stop_details to Managed Agents session idle events (2225664)
api: add Claude Enterprise analytics, spend limits, and RBAC groups and roles to the Admin API (9039d31)
api: add per-user usage and cost reports to the Admin API analytics (14fa777)
api: add Plugins and Plugin Marketplaces to the Admin API (785997a)
api: add repository error types to Managed Agents session errors (9dfb79b)
api: allow removing a plugin's org-wide installation setting (ef365f2)
api: MCP tunnels beta: add read-only transport object to Tunnel and return the one-time relay token in the create response (f6572a5)
api: Organization API endpoints are now GA (4fc56d2)

Bug Fixes

api: make memory store description, metadata, archived_at required (b8bf04b)
api: type admin plugin preference and marketplace fields as enums (9e2de19)
client: redact sensitive headers in DumpRequest and DumpResponse (f57d275)
pagination: auto-paging continues past an empty page while next_page is set (2c8cdd7)
tools: stop the session tool runner after any idle that ends the turn (#413) (bb2421f)

Chores

api: update MCP Tunnels types and descriptions (1b0aac7)
docs: remove placeholder enum descriptions (d156e86)
tests: platform clients do not mirror the Organization service (#414) (108cfae)

Open source →

v1.76.1-0.20260930182430-617823db37e630 Sept 2026pre-release

Nothing published for this version

v1.76.028 Sept 20263 sources agree

api: add between_tools thinking type

1.76.0 (2026-09-28)

Full Changelog: v1.75.0...v1.76.0

Features

api: add between_tools thinking type (bc5be8f)
api: add claude-sonnet-5-5 (48993ca)
api: add include_inherited and source to workspace rate limits (bd6bb6d)
api: add typed event type values to the Managed Agents events list filter (019b05b)
api: cache diagnostics GA — diagnostics on Message / MessageCreateParams (4ea973c)

Bug Fixes

client: pass HTTP client when cloning request config (cd8f34f)
client: retry when the connection drops part-way through a response (4f7f317)
client: send no placeholder filename for unnamed file uploads (968849c)
helpers: degrade between_tools thinking to disabled on fallback hops (#410) (aa15d36)

Performance Improvements

client: decode SSE streams without per-event allocations (0f84503)

Chores

ci: choose the CI runner by repository (acb082a)
docs: clarify that stream: true returns the raw event stream (5fafdf0)
docs: make Managed Agents actor descriptions resource-neutral (ae3cc2f)
docs: restore the research-preview notice on the Dream type (d95f40a)
internal: simplify request execution (4a68721)

Documentation

api: prefer each field's own description over its shared type's (d05f55e)

Open source →

v1.75.1-0.20260928175216-78e786beb95f28 Sept 2026pre-release

Nothing published for this version

v1.75.1-0.20260925210702-aa15d367b5f025 Sept 2026pre-release

Nothing published for this version

v1.75.022 Sept 20263 sources agree

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

1.75.0 (2026-09-22)

Full Changelog: v1.74.0...v1.75.0

Features

api: add support for claude-opus-5-5, inline tool definitions and MCP tool-list pinning (beta) (0a2186a)

Bug Fixes

api: share one evaluated_permission enum across Managed Agents events (30e2056)
client: preserve extra fields when unmarshalling open-object params (c29d53b)
tools: AddTools takes effect straight away (#406) (21e68b2)
tools: leave reply-only params off the tool runner's compaction request (#404) (79ed488)

Chores

docs: add descriptions to the Dreams API reference (f7b86c8)
docs: add descriptions to the User Profiles API reference (f7b86c8)
docs: add memory store descriptions to the Managed Agents API reference (f7b86c8)
docs: improve descriptions in the Dreams API reference (39392dc)
docs: update diagnostics field descriptions on beta messages (eb18011)

Documentation

add path and header parameter descriptions (09da68f)

Open source →

v1.74.1-0.20260922162247-620ac8c9766822 Sept 2026pre-release

Nothing published for this version

v1.74.018 Sept 2026Deprecated3 sources agree

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

1.74.0 (2026-09-18)

Full Changelog: v1.73.0...v1.74.0

Features

api: add group with display_name to rate limits, deprecate group_type (9594cc6)
environments: HandleItem can continue a lease another process already started (#366) (fb8ce32)
foundry: add client for Claude on Microsoft Foundry (#388) (146568e)
tools: add CompactBeforeNextTurn() to the tool runner (#392) (d53fb92)

Bug Fixes

bedrock: split comma-joined anthropic-beta values into separate betas (#386) (d8fc56f)
bedrock: surface mid-stream exception and error frames as API errors (#384) (511aae2)

Chores

docs: add descriptions for enum values and path parameters (96a07b7)
docs: clarify the compaction tool_changes and tool change descriptions (3610ca4)

Open source →

v1.73.1-0.20260918155229-36940857482c18 Sept 2026pre-release

Nothing published for this version

v1.73.015 Sept 2026Deprecated3 sources agree

api: fix typo in temperature deprecation message

1.73.0 (2026-09-15)

Full Changelog: v1.72.0...v1.73.0

Features

api: add compaction parameter and signed compaction blocks (beta) (e8fde9a)
api: add enum types for workspace data-residency geo fields (2a6278f)
api: add thinking_mismatch_allowed entries to input_transformations (beta) (94f69a4)
api: add url_sources to the web fetch tool (739316b)
api: add workspace_id parameter to user profiles methods (2fe76c4)

Bug Fixes

api: use one input transformation type for message and delta event (4ce03aa)
tests: compare the input transformation reason as a string (e1c9fb6)

Chores

docs: clarify that session_thread_id on tool use events is informational (4c1ee73)
docs: correct the compaction beta's parameter descriptions (5716f68)
internal: move the default HTTP client constructor into internal/requestconfig (ffb85e5)
tests: stop the mock server without failing a passing test run (b03bf9d)

Documentation

api: add descriptions to enum constants (2fc6555)
api: clarify usage.iterations entry typing under server-side fallback (1661494)
api: fix typo in temperature deprecation message (6295557)
stop documenting unions with their first variant's description (e8d63c8)

Open source →

v1.72.1-0.20260915150333-2fe81ca6d78015 Sept 2026pre-release

Nothing published for this version

v1.72.010 Sept 20263 sources agree

api: add auto mode tool permissions for Managed Agents

1.72.0 (2026-09-10)

Full Changelog: v1.71.0...v1.72.0

Features

api: add auto mode tool permissions for Managed Agents (f72f8e3)
api: add content_too_large web_fetch tool error code (21646a7)
api: add the user-profiles-2026-09-04 beta value and external_user_details to user profiles (33a5b11)
api: support mounting public GitHub repositories without an authorization_token in Managed Agents sessions (bc1c282)

Chores

docs: correct the environment scope field description (e12b6ee)
internal: restore package version (960768e)
internal: stop stamping the package version into generated files (8455921)
tests: restore empty test package marker files (9f6d405)

Open source →

v1.71.1-0.20260910173954-33e739cac9b210 Sept 2026pre-release

Nothing published for this version

v1.71.04 Sept 20263 sources agree

api: add named types for organization compliance settings state

1.71.0 (2026-09-04)

Full Changelog: v1.70.1...v1.71.0

Features

api: add named types for organization compliance settings state (5ce34ff)

Chores

examples: refresh platform model IDs (#327) (4b064a1)
tests: reword the skip reason on the path-level query param tests (c0b3d71)

Open source →

v1.70.2-0.20260904220616-b743b141da6e4 Sept 2026pre-release

Nothing published for this version

v1.70.13 Sept 20263 sources agree

1.70.1 (2026-09-03) Full Changelog: v1.70.0...v1.70.1

1.70.1 (2026-09-03)

Full Changelog: v1.70.0...v1.70.1

Open source →

v1.70.1-0.20260903222431-b198dfcbdb253 Sept 2026pre-release

Nothing published for this version

v1.70.03 Sept 20263 sources agree

api: add support for sending a workspace ID on more endpoints

1.70.0 (2026-09-02)

Full Changelog: v1.69.0...v1.70.0

Features

api: add support for sending a workspace ID on more endpoints (75477bf)

Bug Fixes

client: surface non-JSON error response bodies in error messages (7e89315)

Chores

internal: narrower codeowners scope (24487eb)
internal: revert codeowners change (0717fba)

Documentation

api: update a few doc strings (5c4b77b)

Open source →

v1.69.1-0.20260902202338-22bb814eb8ad2 Sept 2026pre-release

Nothing published for this version

v1.69.01 Sept 20263 sources agree

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

1.69.0 (2026-09-01)

Full Changelog: v1.68.0...v1.69.0

Features

api: beta user profiles: add external_user_onboarded_at, remove relationship in favor of access_type (d8b0de6)
api: manual updates (b508af4)
api: organization compliance settings, user-profile order_by, memory-store and toolset schema updates (ee32922)

Bug Fixes

client: send only the base name of a file's path as its multipart filename (fd15b77)

Documentation

changelog: detail the beta files/skills GA-shape change (#426) (3612d4c)

Open source →

v1.68.1-0.20260831193313-ee32922c1a5231 Aug 2026pre-release

Nothing published for this version

v1.68.1-0.20260831184059-3612d4c4da5031 Aug 2026pre-release

Nothing published for this version

v1.68.1-0.20260831175914-df9dede0daea31 Aug 2026pre-release

Nothing published for this version

v1.68.027 Aug 2026

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

1.68.0 (2026-08-27)

Full Changelog: v1.67.0...v1.68.0

Features

api: beta files/skills namespaces use GA shapes; drop dated beta header pins (90ee202)

Bug Fixes

bedrock: leave non-JSON request bodies untouched (#337) (3a2e758)
client: report Windows correctly in X-Stainless-OS header (ceb299f)
client: retry attempts that hit the per-request timeout (49b9527)
sessions: deliver completed tool calls when the runner terminates (#322) (642d6a0)
sessions: read event fields via variant accessors in session helpers (#336) (fb7ec8a)
tools: let read return a view_range of a file over the size cap (#341) (33d4f9d)
webhooks: require headers to be passed to unwrap() (9a1023a)

Documentation

api: clarify pagination on the organization rate-limit list endpoints (0b6ba47)

Open source →

Additional notes2 sources agree

Full Changelog: v1.67.0...v1.68.0

Features

api: beta files/skills namespaces use GA shapes; drop dated beta header pins (90ee202)

The beta Files and Skills services (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). Requests that still send those headers on raw HTTP keep receiving the beta shapes.

Changes in the beta services:
- client.Beta.Skills.Delete() now deletes a Skill together with all of its versions (previously refused while any version existed). It returns BetaDeletedSkill (was BetaSkillDeleteResponse).
- Beta Messages type BetaSkill (container skill reference with SkillID, Type, Version) is renamed BetaContainerSkill, and BetaSkillType is renamed BetaContainerSkillType; the request-side BetaSkillParams keeps its name. BetaSkill now names the Skill object returned by client.Beta.Skills.New() / Get() / List() (replacing BetaSkillNewResponse / BetaSkillGetResponse / BetaSkillListResponse), and skill versions are BetaSkillVersion / BetaDeletedSkillVersion (replacing BetaSkillVersion*Response).
- client.Beta.Files.List() returns pagination.PageCursor[BetaFileMetadata] (with Data / NextPage) and BetaFileListParams paginates with Page / IDs (was pagination.Page[BetaFileMetadata] with Data, HasMore, FirstID, LastID and BeforeID / AfterID); ListAutoPaging() now returns pagination.PageCursorAutoPager[BetaFileMetadata]. BetaSkill uses DisplayName (was DisplayTitle, also on BetaSkillNewParams) and LatestVersionID (was LatestVersion), 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

bedrock: leave non-JSON request bodies untouched (#337) (3a2e758)
client: report Windows correctly in X-Stainless-OS header (ceb299f)
client: retry attempts that hit the per-request timeout (49b9527)
sessions: deliver completed tool calls when the runner terminates (#322) (642d6a0)
sessions: read event fields via variant accessors in session helpers (#336) (fb7ec8a)
tools: let read return a view_range of a file over the size cap (#341) (33d4f9d)
webhooks: require headers to be passed to unwrap() (9a1023a)

Documentation

api: clarify pagination on the organization rate-limit list endpoints (0b6ba47)

v1.67.026 Aug 20263 sources agree

api: add updates thinking display mode (beta)

1.67.0 (2026-08-26)

Full Changelog: v1.66.0...v1.67.0

Features

api: add updates thinking display mode (beta) (44fa7a6)
api: add missing anthropic-beta values (118b499)
api: add support for Organization API endpoints (713c567)

Bug Fixes

messages: add missing ToParam methods and exhaustiveness test (#245) (e385915)
tools: keep the tool runner going on pause_turn (#250) (2fa015b)

Chores

docs: clarify skill version latest support and memory version retention (c5d5ac4)
internal: cancel superseded CI runs (5413684)

Documentation

api: clarify session thread agent and usage.iterations compaction descriptions (beta) (e017f63)

Open source →

v1.66.019 Aug 20263 sources agree

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

1.66.0 (2026-08-19)

Full Changelog: v1.65.0...v1.66.0

Features

api: managed agents web search config and self hosted sandbox memory (694b03a)

Open source →

v1.65.019 Aug 20263 sources agree

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

1.65.0 (2026-08-19)

Full Changelog: v1.64.0...v1.65.0

Features

api: Files and Skills APIs are now GA; add computer use and browser use toolsets (e7be7af)

Open source →

v1.64.019 Aug 20263 sources agree

api: additions to files and memory stores

1.64.0 (2026-08-18)

Full Changelog: v1.63.1...v1.64.0

Features

api: additions to files and memory stores (5c105da)
api: updates to skill, files, and user profiles (a0061d6)

Bug Fixes

api: remove unsupported mid_conv_system content block (bced0f9)
session-runner: retry tool-result sends for at least the lease TTL (#299) (ebc9533)
tool-runner: forward the server-assigned container on follow-up requests (#277) (860620c)
toolrunner: don't yield the final message twice from All() (#314) (1e418f0)

Chores

internal: remove leftover prism references (a1d9eab)

Open source →

v1.63.113 Aug 20263 sources agree

auth: pin token exchange to the configured base URL and skip auth for other origins

1.63.1 (2026-08-13)

Full Changelog: v1.63.0...v1.63.1

Bug Fixes

auth: pin token exchange to the configured base URL and skip auth for other origins (#258) (6e4141c)
client: apply stop_details from every message_delta when accumulating (#253) (c197a64)
client: properly render maxLength and maxItems in generated schemas (84a57f5)
sessions: post "(no output)" for empty text tool results instead of an empty text block (#236) (a588842)

Chores

ci: run breaking-change detection as a ci.yml job on every push (29aebdb)

Documentation

api: clarify that user profile name is optional for resold profiles (1039f95)

Open source →

v1.63.011 Aug 20263 sources agree

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

1.63.0 (2026-08-10)

Full Changelog: v1.62.0...v1.63.0

Features

api: add output_behavior to dream creation (create a new memory store or update the input store in place) (ba999d5)

Bug Fixes

client: add models (a662a31)
symlink-loop paths, special archive members, and 409 retry in the agent toolset and environment worker (#226) (82aa034)
vertex: preserve a user-supplied HTTP client by wrapping its transport with Google auth (#242) (8e85a8e)

Open source →

v1.62.06 Aug 20263 sources agree

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

1.62.0 (2026-08-06)

Full Changelog: v1.61.0...v1.62.0

Features

api: add mid-conversation-tool-changes-2026-07-01 beta (f53c3d3)
api: add support for session budgets, advisor tool, pinned inference location and skills auto-loading from GitHub (89c04c2)

Bug Fixes

client: preserve wire-faithful JSON in accumulated streaming messages (#197) (9a01ac0)
jsonl: prevent silent truncation of large results, and don't panic on close (#203) (77dd33d)
tools: name tool refusals and a dead shell so they can be matched (#213) (da87d4d)

Chores

api: remove retired Claude Opus 4.1 models (85fdf3b)
docs: small updates to descriptions (487e6ea)
docs: updates to a few documentation strings (03dc511)

Open source →

v1.61.024 Jul 20263 sources agree

api: add tool addition/removal blocks and tool_change events

1.61.0 (2026-07-24)

Full Changelog: v1.60.0...v1.61.0

Features

api: add claude-opus-5 model (bb7dc83)
api: add tool addition/removal blocks and tool_change events (bb7dc83)
api: expand client-side fallback credit token types and add server-side fallbacks default option (bb7dc83)

Open source →

v1.60.023 Jul 20263 sources agree

api: add new stop reason 'model_context_window_exceeded'

1.60.0 (2026-07-23)

Full Changelog: v1.59.0...v1.60.0

Features

api: add new stop reason 'model_context_window_exceeded' (94caa5d)

Bug Fixes

apijson: correct unmarshaling for param types (#73) (661be2e)
client: escape HTML in RawJSON overrides of nested properties (3b163e2)
refer to the CLI as ant in auth error messages (#194) (d6508c7)

Open source →

v1.59.022 Jul 20263 sources agree

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

1.59.0 (2026-07-22)

Full Changelog: v1.58.1...v1.59.0

Features

api: add support for Managed Agents model effort, initial session events, and threads delta streaming (abca19a)

Open source →

v1.58.121 Jul 20263 sources agree

client: copy all citation fields in ToParam conversions

1.58.1 (2026-07-21)

Full Changelog: v1.58.0...v1.58.1

Bug Fixes

client: copy all citation fields in ToParam conversions (#191) (26ac1f9)
vertex: default to the cloud-platform scope in WithGoogleAuth (#190) (7931e70)

Chores

api: add support for new refusal category (f77159c)
docs: small updates (576dc36)
docs: small updates (f618082)
internal: codegen related update (03fee5d)

Open source →

v1.58.016 Jul 20262 sources agree

api: add support for MCP Tunnels

Full Changelog: v1.57.0...v1.58.0

Features

api: add support for MCP Tunnels (3465b89)

Open source →

v1.57.010 Jul 20262 sources agree

tools: gate session tool calls on evaluated_permission

Full Changelog: v1.56.0...v1.57.0

Features

api: add support for dreaming (3736bf0)
tools: gate session tool calls on evaluated_permission (#151) (4d85a6f)

Bug Fixes

helpers: distinguish canonical agent.message events from open previews (#118) (c49c17c)

Chores

docs: small updates to field descriptions (61bc396)
docs: update model example (937a29c)
docs: updates to descriptions and examples (2c59f79)

Open source →

v1.56.02 Jul 20262 sources agree

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

Full Changelog: v1.55.1...v1.56.0

Features

api: add agent-memory-2026-07-22 beta header (5bcfda4)

Open source →

v1.55.11 Jul 20262 sources agree

api: remove some nonfunctional types from the SDKs

Full Changelog: v1.55.0...v1.55.1

Chores

api: remove some nonfunctional types from the SDKs (9bd3d09)

Open source →

v1.55.030 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

Full Changelog: v1.54.0...v1.55.0

Features

api: add support for Managed Agents event delta streaming, agent overrides, reverse pagination, vault credential injection scoping, and agent and deployment webhook events (021ef45)

Open source →

v1.54.030 Jun 20262 sources agree

api: add support for claude-sonnet-5

Full Changelog: v1.53.0...v1.54.0

Features

api: add support for claude-sonnet-5 (232cfe6)

Bug Fixes

agenttoolset: allow absolute paths that resolve inside workdir (#93) (3735258)

Open source →

v1.53.029 Jun 20262 sources agree

api: add support for 20260318 web fetch and support tools

Full Changelog: v1.52.0...v1.53.0

Features

api: add support for 20260318 web fetch and support tools (6396455)

Chores

api: accept user profile ID's when counting tokens (d31ba27)
docs: updates to descriptions and example values (cb00f34)

Open source →

v1.52.024 Jun 20262 sources agree

client: add support for system.message streaming events

Full Changelog: v1.51.1...v1.52.0

Features

client: add support for system.message streaming events (7bb296d)

Chores

api: add support for new refusal category (46f8625)
api: add support for sending User Profile ID in request headers (5cab486)

Open source →

v1.51.122 Jun 20262 sources agree

helpers: single source for x-stainless-helper, append semantics, and tag the fallback middleware

Full Changelog: v1.51.0...v1.51.1

Bug Fixes

helpers: single source for x-stainless-helper, append semantics, and tag the fallback middleware (#88) (ebbdb7d)

Open source →

v1.51.018 Jun 20262 sources agree

api: add support for new code_execution_20260120 tool

Full Changelog: v1.50.2...v1.51.0

Features

api: add support for new code_execution_20260120 tool (f54a4a8)

Open source →

v1.50.215 Jun 20262 sources agree

api: remove retired models from API and SDKs

Full Changelog: v1.50.1...v1.50.2

Chores

api: remove retired models from API and SDKs (11f5c82)

Open source →

v1.50.19 Jun 20262 sources agree

api: add frontier_llm refusal category

Full Changelog: v1.50.0...v1.50.1

Bug Fixes

api: add frontier_llm refusal category (9ebbaf7)

Open source →

v1.50.09 Jun 20262 sources agree

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

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

Features

api: add support for Managed Agents deployments and environment variable credentials (f72e1d8)

Open source →

v1.49.09 Jun 20262 sources agree

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

Full Changelog: v1.48.0...v1.49.0

Features

api: add support for claude-mythos-5 and claude-fable-5, with support for server-side fallbacks on refusal (782f223)
client: adds client-side fallbacks middleware for API providers that do not support server-side fallbacks (782f223)

Bug Fixes

3p middleware ordering (#38) (8f47086)

Open source →

v1.48.06 Jun 20262 sources agree

api: small updates to Managed Agents types

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

Features

api: small updates to Managed Agents types (3ebeea5)

Open source →

v1.47.05 Jun 2026Deprecated2 sources agree

api: mark Claude Opus 4.1 as deprecated

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

Features

api: mark Claude Opus 4.1 as deprecated (64b20dc)
require Go 1.24 (#11) (00fae19)

Bug Fixes

streaming: accumulate content block events by index (#6) (2161a38)
streaming: carry encrypted_content through beta compaction accumulator (#875) (13fa611)
streaming: carry stop_details and usage fields through beta message_delta (#879) (d432c9f)
streaming: carry stop_details and usage fields through message_delta (#877) (e2fcc35)
support invopop/jsonschema v0.14.0 (switch to pb33f/ordered-map) (#10) (af018a7)

Chores

internal: fix artifact url (fd4cde3)
internal: fix branch names (e1730cd)
internal: update private repo name (29f7468)

Documentation

point security reports to Anthropic's HackerOne program (#9) (c143385)

Open source →

v1.46.028 May 20262 sources agree

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

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

Features

api: Add support for claude-opus-4-8, mid-conversation system blocks, and usage.output_tokens_details (4cd860b)
support custom file size caps (#876) (99634e8)

Chores

examples: rename managed-agents private-sandbox-worker to self-hosted-sandbox-worker (#873) (07d3e46)

Documentation

replace literal newlines (cbb7ea5)

Open source →

v1.45.1-0.20260527003116-cbccc4c9585527 May 2026pre-release

Nothing published for this version

v1.45.1-0.20260527003044-0114b4a36f3427 May 2026pre-release

Nothing published for this version

v1.45.021 May 20262 sources agree

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

Full Changelog: v1.44.1...v1.45.0

Features

api: Add support for thinking-token-count beta for estimated tokens in thinking block deltas when streaming (dedeb6d)

Open source →

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github.com/anthropics/anthropic-sdk-go

Release timeline

Releases

Chores

1.79.0 (2026-10-07)

Features

Bug Fixes

Chores

Documentation

1.78.0 (2026-09-30)

Features

Chores

1.77.0 (2026-09-30)

Features

Bug Fixes

Chores

1.76.0 (2026-09-28)

Features

Bug Fixes

Performance Improvements

Chores

Documentation

1.75.0 (2026-09-22)

Features

Bug Fixes

Chores

Documentation

1.74.0 (2026-09-18)

Features

Bug Fixes

Chores

1.73.0 (2026-09-15)

Features

Bug Fixes

Chores

Documentation

1.72.0 (2026-09-10)

Features

Chores

1.71.0 (2026-09-04)

Features

Chores

1.70.1 (2026-09-03)

1.70.0 (2026-09-02)

Features

Bug Fixes

Chores

Documentation

1.69.0 (2026-09-01)

Features

Bug Fixes

Documentation

1.68.0 (2026-08-27)

Features

Bug Fixes

Documentation

Features

Bug Fixes

Documentation

1.67.0 (2026-08-26)

Features

Bug Fixes

Chores

Documentation

1.66.0 (2026-08-19)

Features

1.65.0 (2026-08-19)

Features

1.64.0 (2026-08-18)

Features

Bug Fixes

Chores

1.63.1 (2026-08-13)

Bug Fixes

Chores

Documentation

1.63.0 (2026-08-10)

Features

Bug Fixes

1.62.0 (2026-08-06)