What's new in Claude

Claude API·Mar 18, 2026

We've added model capability fields to the Models API

GET /v1/models and GET /v1/models/{model_id} now return max_input_tokens, max_tokens, and a capabilities object. Query the API to discover what each model supports.

Claude API·Mar 16, 2026

We've launched the display field for extended thinking, letting you omit thinking content from responses for…

Set thinking.display: "omitted" to receive thinking blocks with an empty thinking field and the signature preserved for multi-turn continuity. Billing is unchanged. Learn more in Controlling thinking display.

Claude API·Mar 13, 2026

The 1M token context window is out of beta for Claude Opus 4.6 and Sonnet 4.6, at standard pricing

Requests over 200k tokens work automatically for these models with no beta header required. The 1M token context window remains in beta for Claude Sonnet 4.5 and Sonnet 4. We've removed the dedicated 1M rate limits for all supported models. We've raised the media limit from 100 to 600 images or PDF pages per request when using the 1M token context window.

Claude API·Feb 19, 2026

We've launched automatic caching for the Messages API

Add a single cache_control field to your request body and the system automatically caches the last cacheable block, moving the cache point forward as conversations grow. No manual breakpoint management required. Works alongside existing block-level cache control for fine-grained optimization. Available on the Claude API and Microsoft Foundry (preview). Learn more in Prompt caching. We've retired the Claude Sonnet 3.7 model (claude-3-7-sonnet-20250219) and the Claude Haiku 3.5 model (claude-3-5-haiku-20241022). We announced the deprecation of the Claude Haiku 3 model (claude-3-haiku-20240307), with retirement scheduled for April 20, 2026.

Claude API·Feb 17, 2026

We've launched Claude Sonnet 4.6, our latest balanced model combining speed and intelligence for everyday…

Sonnet 4.6 delivers improved agentic search performance while consuming fewer tokens. Sonnet 4.6 supports extended thinking and a 1M token context window (beta). API code execution is now free when used with web search or web fetch. The web search tool and programmatic tool calling are available with no beta header required. The code execution tool, web fetch tool, tool search tool, tool use examples, and memory tool no longer require a beta header.

Claude API·Feb 7, 2026

We've launched fast mode in research preview for Opus 4.6, providing significantly faster output token…

Fast mode is up to 2.5x as fast at premium pricing. Interested customers should join the waitlist.

Claude API·Feb 5, 2026

We've launched Claude Opus 4.6, our most intelligent model for complex agentic tasks and long-horizon work

Opus 4.6 recommends adaptive thinking (thinking: {type: "adaptive"}); manual thinking (type: "enabled" with budget_tokens) is deprecated. Opus 4.6 does not support prefilling assistant messages. Learn more in What's new in Claude 4.6. The effort parameter no longer requires a beta header and now supports Claude Opus 4.6. We've launched the compaction API in beta, providing server-side context summarization for effectively infinite conversations. We've introduced data residency controls, allowing you to specify where model inference runs with the inference_geo parameter. The 1M token context window is now available in beta for Claude Opus 4.6, in addition to Sonnet 4.5 and Sonnet 4. Fine-grained tool streaming no longer requires a beta header on any model or platform.

Claude API·Jan 29, 2026

Structured outputs are out of beta on the Claude API for Claude Sonnet 4.5, Claude Opus 4.5, and Claude…

This release includes expanded schema support, improved grammar compilation latency, and a simplified integration path with no beta header required. The output_format parameter has moved to output_config.format. Existing beta users can continue using the beta header during the transition period. Structured outputs remain in public beta on Amazon Bedrock and Microsoft Foundry.

Claude API·Jan 12, 2026

console.anthropic.com now redirects to platform.claude.com

The Claude Console has moved to its new home as part of our Claude brand consolidation. Existing bookmarks and links will continue working through an automatic redirect.

Claude API·Jan 5, 2026

We've retired the Claude Opus 3 model

All requests to this model will now return an error. We recommend upgrading to Claude Opus 4.5, which offers significantly improved intelligence at a third of the cost. Researchers can request ongoing access to Claude Opus 3 on the API through the External Researcher Access Program.

Claude API·Dec 19, 2025

We announced the deprecation of the Claude Haiku 3.5 model

Read more in Model deprecations.

Claude API·Dec 4, 2025

Structured outputs now supports Claude Haiku 4.5

Claude API·Nov 24, 2025

We've launched Claude Opus 4.5, our most intelligent model combining maximum capability with practical…

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 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.

Claude API·Nov 21, 2025

Search result content blocks are now available on Amazon Bedrock with no beta header required

Learn more in Search results.

Claude API·Nov 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.

Claude API·Nov 14, 2025

We've launched structured outputs in public beta, providing guaranteed schema conformance for Claude's…

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.

Claude API·Oct 28, 2025

We announced the deprecation of the Claude Sonnet 3.7 model

Read more in Model deprecations. We've retired the Claude Sonnet 3.5 models. We've expanded context editing with thinking block clearing (clear_thinking_20251015), enabling automatic management of thinking blocks.

Claude API·Oct 16, 2025

We've launched Agent Skills, 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 through 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 Agent Skills and API reference

Claude API·Oct 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 Models overview.

Claude API·Sep 29, 2025

We've launched Claude Sonnet 4.5, our best model for complex agents and coding, with the highest…

Learn more in the models overview. We've introduced global endpoint pricing for Amazon Bedrock and Vertex AI. We've introduced a new stop reason model_context_window_exceeded that allows you to request the maximum possible tokens without calculating input size. We've launched the memory tool in beta, enabling Claude to store and consult information across conversations. We've launched context editing in beta, providing strategies to automatically manage conversation context.

Claude API·Sep 17, 2025

We've launched tool helpers in beta for the Python and TypeScript SDKs, simplifying tool creation and…

For details, see the documentation for the Python SDK and the TypeScript SDK.

Claude API·Sep 16, 2025

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: * Claude Console (console.anthropic.com) → Claude Console (platform.claude.com). The console will be available at both URLs until January 12, 2026. After that date, console.anthropic.com will automatically redirect to platform.claude.com. * Anthropic Docs (docs.anthropic.com) → Claude Docs (docs.claude.com) * Anthropic Help Center (support.anthropic.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.

Claude API·Sep 10, 2025

We've launched the web fetch tool in beta, allowing Claude to retrieve full content from specified web pages…

Learn more in Web fetch tool. 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.

Claude API·Sep 8, 2025

We launched a beta version of the C# SDK

Claude API·Sep 5, 2025

We've launched rate limit charts in the Console Usage page, allowing you to monitor your API rate limit…

Claude API·Sep 3, 2025

We've launched support for citable documents in client-side tool results

Learn more in Handle tool calls.

Claude API·Sep 2, 2025

We've launched v2 of the Code Execution Tool in public beta, replacing the original Python-only tool with…

Claude API·Aug 27, 2025

We launched a beta version of the PHP SDK

Claude API·Aug 26, 2025

We've increased rate limits on the 1M token context window for Claude Sonnet 4 on the Claude API

The 1M token context window is now available on Vertex AI.