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release: 2.12.0 #291

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@stainless-app stainless-app bot commented Nov 24, 2025 •
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Automated Release PR

2.12.0 (2026-01-24)

Full Changelog: v2.11.1...v2.12.0

Features

  • add output_config to message create params (4c4bb5d)
  • api: Add new methods to tests (#748) (2c2ebdc)
  • api: adds support for Claude Opus 4.5, Effort, Advance Tool Use Features, Autocompaction, and Computer Use v5 (4689271)
  • api: migrate sending message format in output_config rather than output_format (c0103c6)
  • api: migrate sending message format in output_config rather than output_format (a6ea665)
  • client: add HttpRequest#url() method (49afe52)
  • client: allow configuring dispatcher executor service (60554ea)
  • client: support Anthropic models on Microsoft Foundry (#698) (8077051)

Bug Fixes

  • client: BetaMessageAccumulator crash on empty tool input (e0fe678)
  • client: cancel okhttp call when future cancelled (b52f783)
  • client: disallow coercion from float to int (492286b)
  • client: fully respect max retries (e593174)
  • client: implement visitToolSearchToolResult for Beta Accumulator (41191ed)
  • client: run linter (73e141d)
  • client: send retry count header for max retries 0 (e593174)
  • date time deserialization leniency (f6f7ad1)
  • remove duplicate code (937b34f)
  • resolve lint error (db08d1c)

Chores

  • ci: add Claude Code GitHub Workflow (4eec6e8)
  • ci: upgrade actions/setup-java (de57407)
  • client: mark claude-3-5-haiku as deprecated (46bf679)
  • fix merge conflict (e307fa0)
  • fix test (b612010)
  • internal: clean up maven repo artifact script and add html documentation to repo root (d319dd7)
  • internal: depend on packages directly in example (e593174)
  • internal: improve maven repo docs (852f6dc)
  • internal: support uploading Maven repo artifacts to stainless package server (17e663a)
  • internal: update actions/checkout version (7fd4f0a)
  • internal: update maven repo doc to include authentication (23d5c76)
  • internal: use different example values for some enums (5d45a2f)
  • test on Jackson 2.14.0 to avoid encountering FasterXML/jackson-databind#3240 in tests (f6f7ad1)

Documentation

  • remove $ for better copy-pasteabality (b2315f9)

This pull request is managed by Stainless's GitHub App.

The semver version number is based on included commit messages. Alternatively, you can manually set the version number in the title of this pull request.

For a better experience, it is recommended to use either rebase-merge or squash-merge when merging this pull request.

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@stainless-app
feat(api): adds support for Claude Opus 4.5, Effort, Advance Tool Use…
4689271 
… Features, Autocompaction, and Computer Use v5
@stainless-app stainless-app bot requested a review from a team as a code owner November 24, 2025 21:48
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@stainless-app
fix(client): fully respect max retries
e593174 
fix(client): send retry count header for max retries 0
chore(internal): depend on packages directly in example
@stainless-app
chore(ci): upgrade actions/setup-java
de57407
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@TomerAberbach TomerAberbach mentioned this pull request Jan 21, 2026
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stainless-app bot commented Jan 23, 2026

🧪 Testing

To try out this version of the SDK, run:

Add the following URL as a Maven source: 'https://pkg.stainless.com/s/anthropic-java/51c68608ef60167776bdbd47de4d21a32c185fd7/mvn'

Expires at: Sun, 22 Feb 2026 16:22:23 GMT
Updated at: Fri, 23 Jan 2026 16:22:23 GMT

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7 participants

@TimMillerDyck @TomerAberbach @dtmeadows @zklapow @damo @cameron-mcateer