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November 24, 2025 · Anthropic

Claude Opus 4.5 launched, with programmatic tool calling and tool search in beta

  • We’ve launched Claude Opus 4.5, our most intelligent model combining maximum capability with practical performance. Ideal for complex specialized tasks, professional software engineering, and advanced agents. Features step-change improvements in vision, coding, and computer use at a more accessible price point than previous Opus models. Learn more in Models overview.
  • We’ve launched programmatic tool calling in beta, allowing Claude to call tools from within code execution to reduce latency and token usage in multi-tool workflows.
  • We’ve launched the tool search tool in beta, enabling Claude to dynamically discover and load tools on-demand from large tool catalogs.
  • We’ve launched the effort parameter in beta for Claude Opus 4.5, allowing you to control token usage by trading off between response thoroughness and efficiency.
  • We’ve added client-side compaction to our Python and TypeScript SDKs, automatically managing conversation context through summarization when using tool_runner.
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Announcements from AWS, Google Cloud, Azure, Cloudflare and the main AI providers in one searchable changelog, with daily, weekly and monthly digests.

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