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Claude Platform Release Notes Overview

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Claude Platform Release Notes Overview

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Published: 2026-05-10 · Source: crawler_authoritative

Tình huống

Official release notes for the Claude Platform covering API updates, model releases, SDK changes, and new features from May 2024 to May 2026. Targets developers building applications using the Claude API, Anthropic SDKs, or Claude platform services.

Insight

The release notes cover comprehensive platform updates across multiple categories. Key model releases include Claude Opus 4.7 (April 2026), Claude Sonnet 4.6 (February 2026), Claude Opus 4.6 (February 2026), Claude Sonnet 4.5 (September 2025), Claude Haiku 4.5 (October 2025), Claude Opus 4.5 (November 2025), Claude Opus 4.1 (August 2025), and Claude 4 models (May 2025). Several models were deprecated and retired including Claude Haiku 3, Claude Sonnet 3.7, Claude Haiku 3.5, Claude Opus 3, Claude Sonnet 3.5, and Claude Sonnet 4/4 (retirement June 15, 2026). The 1M token context window became generally available for Opus 4.6 and Sonnet 4.6 in March 2026 at standard Pricing. Claude Managed Agents launched in public beta (April 2026) with features including multiagent sessions, outcomes, vault credential refresh for mcp_oauth, webhooks for session and vault lifecycle events, and memory support. The ant CLI launched for command-line API interaction with YAML resource versioning. The advisor tool enables pairing executor and advisor models for strategic guidance. Extended thinking, structured outputs, prompt caching, web search, web fetch, code execution, fine-grained tool streaming, memory tool, and context editing all moved from beta to GA. Agent Skills launched for extending Claude with organized instructions and scripts for PowerPoint, Excel, Word, and PDF files. Data residency controls via the inference_geo parameter allow US-only inference. The effort parameter replaced budget_tokens for controlling thinking depth. Automatic caching for the Messages API uses cache_control field to move cache points forward. The Rate Limits API allows programmatic querying of rate limits. Claude in Amazon Bedrock and Microsoft Foundry integrations expanded availability. Official SDKs released include Python, TypeScript, Go (GA), Ruby, Java (GA), C#, and PHP.

Hành động

To use new features, include appropriate beta headers such as managed-agents-2026-04-01 for managed agents, advisor-tool-2026-03-01 for advisor tool, or output-300k-2026-03-24 for extended batch output. For model migrations, replace deprecated model IDs with current versions: claude-haiku-3 with claude-haiku-4-20250514, claude-sonnet-4 with claude-sonnet-4-6-20260217, claude-opus-4 with claude-opus-4-7-20260416. Set inference_geo parameter for data residency controls. Use cache_control field in request body for automatic caching. Include beta header for 1M context window on older models (context-1m-2025-08-07) until April 30, 2026 retirement. Access Rate Limits API at /v1/rate_limits for programmatic rate limit queries. Install ant CLI for command-line API interaction. Access Claude in Amazon Bedrock via /anthropic/v1/messages endpoint in 27 AWS regions.

Kết quả

New model releases provide improved intelligence, extended thinking, adaptive thinking, and 1M token context window support. Beta features like Claude Managed Agents, advisor tool, and Agent Skills enable advanced agentic workflows. Deprecated models return errors after retirement dates. 1M token context window works automatically for Opus 4.6 and Sonnet 4.6 without beta headers. Structured outputs guarantee schema conformance with output_config.format parameter. Fine-grained tool streaming eliminates JSON buffering. Webhooks deliver session and vault lifecycle events. Vault credential background refresh maintains mcp_oauth credentials automatically.

Điều kiện áp dụng

Release notes apply to all developers using Claude API, Amazon Bedrock, Google Vertex AI, Microsoft Azure Foundry, or Anthropic SDKs. Beta headers required for preview features. Some features have version or region limitations.

Nội dung gốc (Original)

Claude Platform

Updates to the Claude Platform, including the Claude API, client SDKs, and the Claude Console.

For release notes on Claude Apps, see the [Release notes for Claude Apps in the Claude Help Center](https://support.claude.com/en/articles/12138966-release-notes).

For updates to Claude Code, see the complete CHANGELOG.md in the claude-code repository.

May 6, 2026

  • Multiagent sessions and Outcomes are now in public beta under the standard managed-agents-2026-04-01 beta header.
  • Vault credential background refresh is now supported for mcp_oauth credentials. See Authenticate with vaults.
  • Webhooks for Claude Managed Agents are now supported. Webhook event types include session and vault lifecycle events. See Subscribe to webhooks.
  • Additional filtering and sorting options are now supported. Sessions can be filtered by status, and events can be filtered by type. Events can now be filtered by creation time.

April 30, 2026

  • We’ve retired the 1M token context window beta (context-1m-2025-08-07) for Claude Sonnet 4.5 and Claude Sonnet 4. The beta header now has no effect on these models, and requests exceeding the standard 200k-token context window return an error. To use the 1M context window, migrate to Claude Sonnet 4.6 or Claude Opus 4.6, where it’s generally available at standard pricing with no beta header required.

April 24, 2026

  • We’ve released the Rate Limits API, allowing administrators to programmatically query the rate limits configured for their organization and workspaces.

April 23, 2026

  • Memory for Claude Managed Agents is now in public beta under the standard managed-agents-2026-04-01 header. See Using agent memory for the full integration guide.

April 20, 2026

  • We’ve retired the Claude Haiku 3 model (claude-3-haiku-20240307). All requests to this model will now return an error. We recommend upgrading to Claude Haiku 4.5.

April 16, 2026

  • We’ve launched Claude Opus 4.7, our most capable generally available model for complex reasoning and agentic coding, at the same $5 / $25 per MTok pricing as Opus 4.6. See What’s new in Claude Opus 4.7 for capability improvements, new features, and the updated tokenizer. Opus 4.7 includes API breaking changes versus Opus 4.6; see Migrating to Claude Opus 4.7 before upgrading.
  • Claude in Amazon Bedrock is now open to all Amazon Bedrock customers. Claude Opus 4.7 and Claude Haiku 4.5 are available self-serve from the Bedrock console through the Messages API endpoint at /anthropic/v1/messages, in 27 AWS regions with global and regional endpoints.

April 14, 2026

  • We announced the deprecation of the Claude Sonnet 4 model (claude-sonnet-4-20250514) and the Claude Opus 4 model (claude-opus-4-20250514), with retirement on the Claude API scheduled for June 15, 2026. We recommend migrating to Claude Sonnet 4.6 and Claude Opus 4.7 respectively. Read more in model deprecations.

April 9, 2026

  • We’ve launched the advisor tool in public beta. Pair a faster executor model with a higher-intelligence advisor model that provides strategic guidance mid-generation, so long-horizon agentic workloads get close to advisor-solo quality while the bulk of token generation happens at executor-model rates. Include the beta header advisor-tool-2026-03-01 in your requests.

April 8, 2026

  • We’ve launched Claude Managed Agents in public beta, a fully managed agent harness for running Claude as an autonomous agent with secure sandboxing, built-in tools, and server-sent event streaming. Create agents, configure containers, and run sessions through the API. All endpoints require the managed-agents-2026-04-01 beta header. Learn more in Claude Managed Agents overview.
  • We’ve launched the ant CLI, a command-line client for the Claude API that enables faster interaction with the Claude API, native integration with Claude Code, and versioning of API resources in YAML files. Learn more in the CLI reference.

April 7, 2026

  • We announced Claude Mythos Preview is available as a gated research preview for defensive cybersecurity work as part of Project Glasswing. Access is invitation-only.
  • The Messages API is now available on Amazon Bedrock as a research preview. The new Claude in Amazon Bedrock endpoint at /anthropic/v1/messages uses the same request shape as the first-party Claude API and runs on AWS-managed infrastructure with zero operator access. Available in us-east-1; contact your Anthropic account executive to request access. Learn more in Claude in Amazon Bedrock.

March 30, 2026

  • We’ve raised the max_tokens cap to 300k on the Message Batches API for Claude Opus 4.6 and Sonnet 4.6. Include the output-300k-2026-03-24 beta header to generate longer single-turn outputs for long-form content, structured data, and large code generation tasks.
  • We’re retiring the 1M token context window beta for Claude Sonnet 4.5 and Claude Sonnet 4 on April 30, 2026. After that date, the context-1m-2025-08-07 beta header will have no effect on these models, and requests that exceed the standard 200k-token context window will return an error. To continue using 1M context windows, migrate to Claude Sonnet 4.6 or Claude Opus 4.6, which support the full 1M token context window at standard pricing with no beta header required.

March 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.

March 16, 2026

  • We’ve launched the display field for extended thinking, letting you omit thinking content from responses for faster streaming. 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.

March 13, 2026

  • The 1M token context window is now generally available 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. Your standard account limits now apply across every context length.
  • We’ve raised the media limit from 100 to 600 images or PDF pages per request when using the 1M token context window.

February 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 Azure AI 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). All requests to these models will now return an error. We recommend upgrading to Claude Sonnet 4.6 and Claude Haiku 4.5 respectively. Researchers can request ongoing access through the External Researcher Access Program.
  • We announced the deprecation of the Claude Haiku 3 model (claude-3-haiku-20240307), with retirement scheduled for April 19, 2026. We recommend migrating to Claude Haiku 4.5. Read more in model deprecations.

February 17, 2026

February 7, 2026

  • We’ve launched fast mode in research preview for Opus 4.6, providing significantly faster output token generation via the speed parameter. Fast mode is up to 2.5x as fast at premium pricing. Interested customers should join the waitlist.

February 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 is now generally available (no beta header required) and supports Claude Opus 4.6. Effort replaces budget_tokens for controlling thinking depth on new models.
  • We’ve launched the compaction API in beta, providing server-side context summarization for effectively infinite conversations. Available on Opus 4.6.
  • We’ve introduced data residency controls, allowing you to specify where model inference runs with the inference_geo parameter. US-only inference is available at 1.1x pricing for models released after February 1, 2026.
  • The 1M token context window is now available in beta for Claude Opus 4.6, in addition to Sonnet 4.5 and Sonnet 4. Long context pricing applies to requests exceeding 200k input tokens.
  • Fine-grained tool streaming is now generally available on all models and platforms (no beta header required). The output_format parameter for structured outputs has been moved to output_config.format.

January 29, 2026

  • Structured outputs are now generally available on the Claude API for Claude Sonnet 4.5, Claude Opus 4.5, and Claude Haiku 4.5. GA 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.

January 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 via automatic redirect. For more details, see the September 16, 2025 announcement.

January 5, 2026

  • We’ve retired the Claude Opus 3 model (claude-3-opus-20240229). 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.

December 19, 2025

  • We announced the deprecation of the Claude Haiku 3.5 model. Read more in Model deprecations.

December 4, 2025

November 24, 2025

  • 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 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.

November 21, 2025

  • Search result content blocks are now generally available on Amazon Bedrock. Learn more in Search results.

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.

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 Claude in Microsoft Foundry.

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.

October 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. 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 Context editing.

October 16, 2025

  • 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 Agent Skills and API reference

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 Models overview.

September 29, 2025

  • 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 the models overview.
  • 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 Handling stop reasons.
  • We’ve launched the memory tool in beta, enabling Claude to store and consult information across conversations. Learn more in Memory tool.
  • 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 Context editing.

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.

September 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:

September 10, 2025

  • 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 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.

September 8, 2025

  • We launched a beta version of the C# SDK.

September 5, 2025

  • We’ve launched rate limit charts in the Console Usage page, allowing you to monitor your API rate limit usage and caching rates over time.

September 3, 2025

  • We’ve launched support for citable documents in client-side tool results. Learn more in Handle tool calls.

September 2, 2025

  • We’ve launched v2 of the Code Execution Tool in public beta, replacing the original Python-only tool with Bash command execution and direct file manipulation capabilities, including writing code in other languages.

August 27, 2025

  • We launched a beta version of the PHP SDK.

August 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 Google Cloud’s Vertex AI. For more information, see Claude on Vertex AI.

August 19, 2025

  • Request IDs are now included directly in error response bodies alongside the existing request-id header. Learn more in Errors.

August 18, 2025

  • We’ve released the Usage & Cost API, allowing administrators to programmatically monitor their organization’s usage and cost data.
  • We’ve added a new endpoint to the Admin API for retrieving organization information. For details, see the Organization Info Admin API reference.

August 13, 2025

  • We announced the deprecation of the Claude Sonnet 3.5 models (claude-3-5-sonnet-20240620 and claude-3-5-sonnet-20241022). These models will be retired on October 28, 2025. We recommend migrating to Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) for improved performance and capabilities. Read more in Model deprecations.
  • The 1-hour cache duration for prompt caching is now generally available. You can now use the extended cache TTL without a beta header. Learn more in Prompt caching.

August 12, 2025

  • We’ve launched beta support for a 1M token context window in Claude Sonnet 4 on the Claude API and Amazon Bedrock.

August 11, 2025

  • Some customers might encounter 429 (rate_limit_error) errors following a sharp increase in API usage due to acceleration limits on the API. Previously, 529 (overloaded_error) errors would occur in similar scenarios.

August 8, 2025

  • Search result content blocks are now generally available on the Claude API and Google Cloud’s Vertex AI. This feature enables natural citations for RAG applications with proper source attribution. The beta header search-results-2025-06-09 is no longer required. Learn more in Search results.

August 5, 2025

  • We’ve launched Claude Opus 4.1, an incremental update to Claude Opus 4 with enhanced capabilities and performance improvements.* Learn more in Models overview.

* - Opus 4.1 does not allow both temperature and top_p parameters to be specified. Please use only one.

July 28, 2025

  • We’ve released text_editor_20250728, an updated text editor tool that fixes some issues from the previous versions and adds an optional max_characters parameter that allows you to control the truncation length when viewing large files.

July 24, 2025

  • We’ve increased rate limits for Claude Opus 4 on the Claude API to give you more capacity to build and scale with Claude. For customers with usage tier 1-4 rate limits, these changes apply immediately to your account - no action needed.

July 21, 2025

  • We’ve retired the Claude 2.0, Claude 2.1, and Claude Sonnet 3 models. All requests to these models will now return an error. Read more in Model deprecations.

July 17, 2025

  • We’ve increased rate limits for Claude Sonnet 4 on the Claude API to give you more capacity to build and scale with Claude. For customers with usage tier 1-4 rate limits, these changes apply immediately to your account - no action needed.

July 3, 2025

  • We’ve launched search result content blocks in beta, enabling natural citations for RAG applications. Tools can now return search results with proper source attribution, and Claude will automatically cite these sources in its responses - matching the citation quality of web search. This eliminates the need for document workarounds in custom knowledge base applications. Learn more in Search results. To enable this feature, use the beta header search-results-2025-06-09.

June 30, 2025

  • We announced the deprecation of the Claude Opus 3 model. Read more in Model deprecations.

June 23, 2025

  • Console users with the Developer role can now access the Cost page. Previously, the Developer role allowed access to the Usage page, but not the Cost page.

June 11, 2025

  • We’ve launched fine-grained tool streaming in public beta, a feature that enables Claude to stream tool use parameters without buffering / JSON validation. To enable fine-grained tool streaming, use the beta header fine-grained-tool-streaming-2025-05-14.

May 22, 2025

  • We’ve launched Claude Opus 4 and Claude Sonnet 4, our latest models with extended thinking capabilities. Learn more in Models overview.
  • The default behavior of extended thinking in Claude 4 models returns a summary of Claude’s full thinking process, with the full thinking encrypted and returned in the signature field of thinking block output.
  • We’ve launched interleaved thinking in public beta, a feature that enables Claude to think in between tool calls. To enable interleaved thinking, use the beta header interleaved-thinking-2025-05-14.
  • We’ve launched the Files API in public beta, enabling you to upload files and reference them in the Messages API and code execution tool.
  • We’ve launched the Code execution tool in public beta, a tool that enables Claude to execute Python code in a secure, sandboxed environment.
  • We’ve launched the MCP connector in public beta, a feature that allows you to connect to remote MCP servers directly from the Messages API.
  • To increase answer quality and decrease tool errors, we’ve changed the default value for the top_p nucleus sampling parameter in the Messages API from 0.999 to 0.99 for all models. To revert this change, set top_p to 0.999. Additionally, when extended thinking is enabled, you can now set top_p to values between 0.95 and 1.
  • We’ve moved our Go SDK from beta to GA.
  • We’ve included minute and hour level granularity to the Usage page of Console alongside 429 error rates on the Usage page.

May 21, 2025

  • We’ve moved our Ruby SDK from beta to GA.

May 7, 2025

  • We’ve launched a web search tool in the API, allowing Claude to access up-to-date information from the web. Learn more in Web search tool.

May 1, 2025

  • Cache control must now be specified directly in the parent content block of tool_result and document.source. For backwards compatibility, if cache control is detected on the last block in tool_result.content or document.source.content, it will be automatically applied to the parent block instead. Cache control on any other blocks within tool_result.content and document.source.content will result in a validation error.

April 9th, 2025

  • We launched a beta version of the Ruby SDK.

March 31st, 2025

  • We’ve moved our Java SDK from beta to GA.
  • We’ve moved our Go SDK from alpha to beta.

February 27th, 2025

  • We’ve added URL source blocks for images and PDFs in the Messages API. You can now reference images and PDFs directly via URL instead of having to base64-encode them. Learn more in Vision and PDF support.
  • We’ve added support for a none option to the tool_choice parameter in the Messages API that prevents Claude from calling any tools. Additionally, you’re no longer required to provide any tools when including tool_use and tool_result blocks.
  • We’ve launched an OpenAI-compatible API endpoint, allowing you to test Claude models by changing just your API key, base URL, and model name in existing OpenAI integrations. This compatibility layer supports core chat completions functionality. Learn more in OpenAI SDK compatibility.

February 24th, 2025

  • We’ve launched Claude Sonnet 3.7, our most intelligent model yet. Claude Sonnet 3.7 can produce near-instant responses or show its extended thinking step-by-step. One model, two ways to think. Learn more about all Claude models in Models overview.
  • We’ve added vision support to Claude Haiku 3.5, enabling the model to analyze and understand images.
  • We’ve released a token-efficient tool use implementation, improving overall performance when using tools with Claude. Learn more in Tool use with Claude.
  • We’ve changed the default temperature in the Console for new prompts from 0 to 1 for consistency with the default temperature in the API. Existing saved prompts are unchanged.
  • We’ve released updated versions of our tools that decouple the text edit and bash tools from the computer use system prompt:
    • bash_20250124: Same functionality as previous version but is independent from computer use. Does not require a beta header.
    • text_editor_20250124: Same functionality as previous version but is independent from computer use. Does not require a beta header.
    • computer_20250124: Updated computer use tool with new command options including “hold_key”, “left_mouse_down”, “left_mouse_up”, “scroll”, “triple_click”, and “wait”. This tool requires the “computer-use-2025-01-24” anthropic-beta header. Learn more in Tool use with Claude.

February 10th, 2025

  • We’ve added the anthropic-organization-id response header to all API responses. This header provides the organization ID associated with the API key used in the request.

January 31st, 2025

  • We’ve moved our Java SDK from alpha to beta.

January 23rd, 2025

  • We’ve launched citations capability in the API, allowing Claude to provide source attribution for information. Learn more in Citations.
  • We’ve added support for plain text documents and custom content documents in the Messages API.

January 21st, 2025

  • We announced the deprecation of the Claude 2, Claude 2.1, and Claude Sonnet 3 models. Read more in Model deprecations.

January 15th, 2025

  • We’ve updated prompt caching to be easier to use. Now, when you set a cache breakpoint, we’ll automatically read from your longest previously cached prefix.
  • You can now put words in Claude’s mouth when using tools.

January 10th, 2025

December 19th, 2024

December 17th, 2024

The following features are now generally available in the Claude API:

  • Models API: Query available models, validate model IDs, and resolve model aliases to their canonical model IDs.
  • Message Batches API: Process large batches of messages asynchronously at 50% of the standard API cost.
  • Token counting API: Calculate token counts for Messages before sending them to Claude.
  • Prompt Caching: Reduce costs by up to 90% and latency by up to 80% by caching and reusing prompt content.
  • PDF support: Process PDFs to analyze both text and visual content within documents.

We also released new official SDKs:

December 4th, 2024

November 21st, 2024

  • We’ve released the Admin API, allowing users to programmatically manage their organization’s resources.

November 20th, 2024

  • We’ve updated our rate limits for the Messages API. We’ve replaced the tokens per minute rate limit with new input and output tokens per minute rate limits. Read more in Rate limits.
  • We’ve added support for tool use in the Workbench.

November 13th, 2024

  • We’ve added PDF support for all Claude Sonnet 3.5 models. Read more in PDF support.

November 6th, 2024

November 4th, 2024

November 1st, 2024

  • We’ve added PDF support for use with the new Claude Sonnet 3.5. Read more in PDF support.
  • We’ve also added token counting, which allows you to determine the total number of tokens in a Message prior to sending it to Claude. Read more in Token counting.

October 22nd, 2024

  • We’ve added Anthropic-defined computer use tools to our API for use with the new Claude Sonnet 3.5. Read more in Computer use tool.
  • Claude Sonnet 3.5, our most intelligent model yet, just got an upgrade and is now available on the Claude API. Read more in the Claude Sonnet documentation.

October 8th, 2024

  • The Message Batches API is now available in beta. Process large batches of queries asynchronously in the Claude API for 50% less cost. Read more in Batch processing.
  • We’ve loosened restrictions on the ordering of user/assistant turns in our Messages API. Consecutive user/assistant messages will be combined into a single message instead of erroring, and we no longer require the first input message to be a user message.
  • We’ve deprecated the Build and Scale plans in favor of a standard feature suite (formerly referred to as Build), along with additional features that are available through sales. Read more in our API pricing information.

October 3rd, 2024

  • We’ve added the ability to disable parallel tool use in the API. Set disable_parallel_tool_use: true in the tool_choice field to ensure that Claude uses at most one tool. Read more in Parallel tool use.

September 10th, 2024

  • We’ve added Workspaces to the Developer Console. Workspaces allow you to set custom spend or rate limits, group API keys, track usage by project, and control access with user roles. Read more in our blog post.

September 4th, 2024

August 22nd, 2024

  • We’ve added support for usage of the SDK in browsers by returning CORS headers in the API responses. Set dangerouslyAllowBrowser: true in the SDK instantiation to enable this feature.

August 19th, 2024

  • We’ve moved 8,192 token outputs from beta to general availability for Claude Sonnet 3.5.

August 14th, 2024

  • Prompt caching is now available as a beta feature in the Claude API. Cache and re-use prompts to reduce latency by up to 80% and costs by up to 90%.

July 15th, 2024

  • Generate outputs up to 8,192 tokens in length from Claude Sonnet 3.5 with the new anthropic-beta: max-tokens-3-5-sonnet-2024-07-15 header.

July 9th, 2024

  • Automatically generate test cases for your prompts using Claude in the Developer Console.
  • Compare the outputs from different prompts side by side in the new output comparison mode in the Developer Console.

June 27th, 2024

June 20th, 2024

  • Claude Sonnet 3.5, our most intelligent model yet, is now generally available across the Claude API, Amazon Bedrock, and Google Vertex AI.

May 30th, 2024

  • Tool use is now generally available across the Claude API, Amazon Bedrock, and Google Vertex AI.

May 10th, 2024

  • Our prompt generator tool is now available in the Developer Console. Prompt Generator makes it easy to guide Claude to generate a high-quality prompts tailored to your specific tasks. Read more in our blog post.

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