Claude Developer Platform Release Notes
Last updated: Dec 20, 2025
- Dec 19, 2025
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Claude Developer Platform by Anthropic
December 19, 2025
- We announced the deprecation of the Claude Haiku 3.5 model. Read more in our documentation.
- Dec 4, 2025
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- Nov 24, 2025
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Claude Developer Platform by Anthropic
November 24, 2025
Anthropic unveils Claude Opus 4.5 with boosted vision, coding and efficiency at a friendlier price, plus public beta tools: programmatic tool calling, tool search, the effort parameter, and client-side compaction in SDKs.
Release notes
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 our Models & Pricing documentation.
We've launched programmatic tool calling in public 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 public beta, enabling Claude to dynamically discover and load tools on-demand from large tool catalogs.
We've launched the effort parameter in public 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.
- Nov 21, 2025
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Claude Developer Platform by Anthropic
November 21, 2025
- Search result content blocks are now generally available on Amazon Bedrock. Learn more in our search results documentation.
- Nov 19, 2025
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Claude Developer Platform by Anthropic
November 19, 2025
- We've launched a new documentation platform at platform.claude.com/docs. Our documentation now lives side by side with the Claude Console, providing a unified developer experience. The previous docs site at docs.claude.com will redirect to the new location.
- Nov 18, 2025
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Claude Developer Platform by Anthropic
November 18, 2025
- We've launched Claude in Microsoft Foundry, bringing Claude models to Azure customers with Azure billing and OAuth authentication. Access the full Messages API including extended thinking, prompt caching (5-minute and 1-hour), PDF support, Files API, Agent Skills, and tool use. Learn more in our Microsoft Foundry documentation.
- Nov 14, 2025
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Claude Developer Platform by Anthropic
November 14, 2025
- We've launched structured outputs in public beta, providing guaranteed schema conformance for Claude's responses. Use JSON outputs for structured data responses or strict tool use for validated tool inputs. Available for Claude Sonnet 4.5 and Claude Opus 4.1. To enable, use the beta header
structured-outputs-2025-11-13.
- Oct 28, 2025
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Claude Developer Platform by Anthropic
October 28, 2025
We announced the deprecation of the Claude Sonnet 3.7 model. Read more in our documentation.
We've retired the Claude Sonnet 3.5 models. All requests to these models will now return an error.
We've expanded context editing with thinking block clearing (
clear_thinking_20251015), enabling automatic management of thinking blocks. Learn more in our context editing documentation.
- Oct 16, 2025
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Claude Developer Platform by Anthropic
October 16, 2025
Anthropic launches Agent Skills beta, letting Claude load dynamic skill folders to tackle PowerPoint, Excel, Word and PDF tasks. It offers pre built Anthropic managed skills and custom skills via the Skills API, all powered by the code execution tool. Learn more in docs and API references.
Agent Skills
- We've launched Agent Skills (
skills-2025-10-02beta), a new way to extend Claude's capabilities. Skills are organized folders of instructions, scripts, and resources that Claude loads dynamically to perform specialized tasks. The initial release includes:- Anthropic-managed Skills: Pre-built Skills for working with PowerPoint (.pptx), Excel (.xlsx), Word (.docx), and PDF files
- Custom Skills: Upload your own Skills via the Skills API (
/v1/skillsendpoints) to package domain expertise and organizational workflows - Skills require the code execution tool to be enabled
- Learn more in our Agent Skills documentation and API reference
- Oct 15, 2025
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Claude Developer Platform by Anthropic
October 15, 2025
- We've launched Claude Haiku 4.5, our fastest and most intelligent Haiku model with near-frontier performance. Ideal for real-time applications, high-volume processing, and cost-sensitive deployments requiring strong reasoning. Learn more in our Models & Pricing documentation.