Anthropic API Release Notes

Nov 14, 2025

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Nov 14, 2025
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Nov 15, 2025

November 14, 2025

Structured outputs in public beta

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.

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Oct 28, 2025

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Oct 28, 2025
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Oct 29, 2025

Anthropic API 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.

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Oct 16, 2025

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Oct 16, 2025
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Oct 17, 2025

Anthropic API by Anthropic

October 16, 2025

Anthropic launches Agent Skills in beta, letting Claude load dynamic, organized task packs. Includes pre-built skills for PowerPoint, Excel, Word, and PDF, plus Custom Skills via the Skills API. Requires the code execution tool; learn more in the docs.

Agent Skills launch

We’ve launched Agent Skills (skills-2025-10-02 beta), 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/skills endpoints) 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

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Oct 15, 2025

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Oct 15, 2025
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Oct 25, 2025

Anthropic API 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.

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Sep 29, 2025

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Sep 29, 2025
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Sep 30, 2025
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Oct 1, 2025

Anthropic API by Anthropic

September 29, 2025

Claude Sonnet 4.5 ships, boosting agents and coding. Global endpoint pricing lands for AWS Bedrock and Vertex AI (Claude API pricing unchanged). New stop reason: model_context_window_exceeded. Memory tool and context editing enter beta for cross-convo recall and token management.

We've launched Claude Sonnet 4.5, our best model for complex agents and coding, with the highest intelligence across most tasks. Learn more in What's new in Claude Sonnet 4.5.

We've introduced global endpoint pricing for AWS Bedrock and Google Vertex AI. The Claude API (1P) pricing is unaffected.

We've introduced a new stop reason model_context_window_exceeded that allows you to request the maximum possible tokens without calculating input size. Learn more in our handling stop reasons documentation.

We've launched the memory tool in beta, enabling Claude to store and consult information across conversations. Learn more in our memory tool documentation.

We've launched context editing in beta, providing strategies to automatically manage conversation context. The initial release supports clearing older tool results and calls when approaching token limits. Learn more in our context editing documentation.

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Sep 17, 2025

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Sep 17, 2025
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Sep 18, 2025
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Sep 26, 2025

Anthropic API by Anthropic

September 17, 2025

We’ve launched tool helpers in beta for the Python and TypeScript SDKs, simplifying tool creation and execution with type-safe input validation and a tool runner for automated tool handling in conversations. For details, see the documentation for the Python SDK and the TypeScript SDK.

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Sep 16, 2025

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Sep 16, 2025
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Sep 17, 2025
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Sep 26, 2025

Anthropic API by Anthropic

September 16, 2025

Anthropic unifies developer offerings under the Claude brand with renamed portals and updated URLs. Claude Console will be at platform.claude.com (dual URLs until Dec 16, 2025). Docs and Help Center rebranded to Claude, while APIs and integrations stay unchanged.

We’ve unified our developer offerings under the Claude brand. You should see updated naming and URLs across our platform and documentation, but our developer interfaces will remain the same. Here are some notable changes:

Anthropic Console (console.anthropic.com) → Claude Console (platform.claude.com). The console will be available at both URLs until December 16, 2025. After that date, console.anthropic.com will automatically redirect to platform.claude.com.
Anthropic Docs (docs.claude.com) → Claude Docs (docs.claude.com)
Anthropic Help Center (support.claude.com) → Claude Help Center (support.claude.com)
API endpoints, headers, environment variables, and SDKs remain the same. Your existing integrations will continue working without any changes.

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Sep 10, 2025

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Sep 10, 2025
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Sep 11, 2025
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Sep 17, 2025

Anthropic API by Anthropic

September 10, 2025

Claude now includes a beta web fetch tool to pull full text from web pages and PDFs, plus a Claude Code Analytics API that provides programmatic access to daily usage metrics, productivity, tool usage, and cost data for Claude Code. Documentation is available.

We’ve launched the web fetch tool in beta, allowing Claude to retrieve full content from specified web pages and PDF documents. Learn more in our web fetch tool documentation.

We’ve launched the Claude Code Analytics API, enabling organizations to programmatically access daily aggregated usage metrics for Claude Code, including productivity metrics, tool usage statistics, and cost data.

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Sep 8, 2025