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* docs: streamline README and centralize documentation - Streamline README, centralize documentation at docs.anthropic.com - Update getting started example to use Opus 4.6 - Replace "Anthropic API" with "Claude API" - Remove beta notice from README - Add link to docs site in CONTRIBUTING.md * feat(client): add equality and tostring for multipart data * docs: address review feedback — rebrand to Claude SDK, fix URLs * fix: remove streaming aggregation example from publishing (#424) * feat: warn when thinking is enabled for certain models (#383) * feat: warn when thinking is enabled for certain models * feat: narrow type signature for thinking warning function * feat(api): Releasing claude-sonnet-4-6 Releasing claude-sonnet-4-6 and GAing advanced tool use features. * fix(api): fix spec errors * fix(client): validate unions properly * fix(tests): remove reference to removed Usage.Speed property (#428) * feat(api): manual updates Makes new tool versions available as top level tool types: - WebSearchTool_20260209 - WebFetchTool_20260209 - ServerToolCaller_20260120 - CodeExecutionTool_20260120 Enables new code execution version `code_execution_20260120` as an 'allowed_caller'. * fix: reset MessageCountTokensTool.cs to match next branch Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> --------- Co-authored-by: stainless-app[bot] <142633134+stainless-app[bot]@users.noreply.github.com> Co-authored-by: Cameron McAteer <246350779+cameron-mcateer@users.noreply.github.com> Co-authored-by: Packy Gallagher <packy@anthropic.com> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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✨ Stainless prepared a new release
Anthropic: 12.9.0
12.9.0 (2026-02-24)
Full Changelog: Anthropic-v12.8.0...Anthropic-v12.9.0
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