# Claude Platform changelog > Release notes for the Claude API, models and developer tools. - Vendor: Anthropic - Category: AI - Official site: https://platform.claude.com - Tracked by: What's New (https://whatsnew.fyi/product/claude-platform) - Harvested from: Blog (https://platform.claude.com/docs/en/release-notes/feed.xml) - Entries below: 15 (newest first) What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog. ## Releases ### Claude Platform release notes — July 24, 2026 - Date: 2026-07-24 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-24-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-8a112744 We've launched Claude Opus 5 ( claude-opus-5 ), a step-change improvement over Claude Opus 4.8. Claude Opus 5 supports a 1M token context window (both the default and the maximum), 128k max output tok… - **added** — Launched Claude Opus 5 with 1M token context window support - **changed** — Claude Opus 5 provides improved capabilities over Claude Opus 4.8 ### Claude Platform release notes — July 22, 2026 - Date: 2026-07-22 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-22-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-8af5cd91 You can now set an effort level on a Claude Managed Agents agent's model configuration. Pass effort inside the model object when you create the agent . See Effort levels for what each level does. Webh… - **added** — Set an effort level on a Claude Managed Agents agent's model configuration by passing effort inside the model object when creating the agent ### Claude Platform release notes — July 17, 2026 - Date: 2026-07-17 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-17-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-e6bf0a55 The legacy Workbench ( platform.claude.com/workbench ) in the Claude Console is being sunset with access ending on August 17, 2026. Saved prompts, variables, and evals are not supported in the updated… - **removed** — Legacy Workbench at platform.claude.com/workbench will sunset with access ending on August 17, 2026 ### Claude Platform release notes — July 15, 2026 - Date: 2026-07-15 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-15-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-ee2b76eb Mid-conversation system messages are available on Claude Fable 5, Claude Mythos 5, and Claude Opus 4.8, on the Claude API, Claude in Amazon Bedrock , and Google Cloud . No beta header is required. Thi… - **added** — Mid-conversation system messages are now available on Claude Fable 5, Claude Mythos 5, and Claude Opus 4.8 via the Claude API, Claude in Amazon Bedrock, and Google Cloud ### Claude Platform release notes — July 14, 2026 - Date: 2026-07-14 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-14-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-c9b2b9dd You can now manage the people in your Claude Enterprise (claude.ai) organization with the Admin API , in beta for all Claude Enterprise organizations: list members and look them up by email address, c… - **added** — Admin API in beta for Claude Enterprise organizations to manage people in your organization, including the ability to list members and look them up by email address ### Claude Platform release notes — July 10, 2026 - Date: 2026-07-10 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-10-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-40683578 Dreams (research preview) now supports Claude Fable 5 and Claude Sonnet 5. See Supported models . We've expanded the Access Transparency documentation of cmek_preserve events with a filter example, an… - **added** — Dreams (research preview) now supports Claude Fable 5 and Claude Sonnet 5 ### Claude Platform release notes — July 8, 2026 - Date: 2026-07-08 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-8-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-bc3d7a11 You can now set an expiration when you create an API key or an Admin API key in the Claude Console . Choose a preset, a custom duration, or Never . For keys with a lifetime of at least 7 days, Anthrop… - **added** — Set an expiration when creating an API key or Admin API key in the Claude Console with preset, custom duration, or never-expiring options ### Claude Platform release notes — July 2, 2026 - Date: 2026-07-02 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-2-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-6eeb5d94 We've added the agent-memory-2026-07-22 beta header, which changes how listing memories ( GET /v1/memory_stores/{memory_store_id}/memories ) behaves: results are returned in a stable, server-defined o… - **added** — Added agent-memory-2026-07-22 beta header for controlling memory listing behavior - **changed** — Memory listing endpoint (GET /v1/memory_stores/{memory_store_id}/memories) now returns results in stable, server-defined order when using the agent-memory-2026-07-22 header ### Claude Platform release notes — July 1, 2026 - Date: 2026-07-01 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#july-1-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie We've restored access to Claude Fable 5 and Claude Mythos 5. See our statement for more information. - **fixed** — Restored access to Claude Fable 5 and Claude Mythos 5 ### Claude Platform release notes — June 30, 2026 - Date: 2026-06-30 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-30-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-edd3ea62 We've launched Claude Sonnet 5 ( claude-sonnet-5 ), the next generation of our Sonnet model family, at introductory pricing of $2 / $10 per MTok through August 31, 2026 (standard $3 / $15 thereafter).… - **added** — Launched Claude Sonnet 5 model with model ID claude-sonnet-5 ### Claude Platform release notes — June 29, 2026 - Date: 2026-06-29 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-29-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-347db6da We've removed fast mode for Claude Opus 4.6. Requests to claude-opus-4-6 with speed: "fast" no longer run at fast speed or premium pricing: they run at standard speed, are billed at standard rates, an… - **removed** — Fast mode for Claude Opus 4.6 has been removed, and requests with speed set to 'fast' now run at standard speed and are billed at standard rates instead ### Claude Platform release notes — June 26, 2026 - Date: 2026-06-26 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-26-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-5f7c8178 We've raised rate limits across the Claude API. Claude Sonnet and Claude Haiku rate limits now match Claude Opus at every usage tier, and usage tiers have been consolidated into three: Start, Build, a… - **changed** — Rate limits have been raised across the Claude API, with Claude Sonnet and Claude Haiku rate limits now matching Claude Opus at every usage tier - **changed** — Usage tiers have been consolidated into three tiers: Start, Build, and Scale ### Claude Platform release notes — June 25, 2026 - Date: 2026-06-25 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-25-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-ab74b054 We've deprecated fast mode for Claude Opus 4.7, with removal on July 24, 2026. After removal, requests to claude-opus-4-7 with speed: "fast" will return an error. Migrate to fast mode for Claude Opus… - **deprecated** — Fast mode for Claude Opus 4.7 is deprecated, with removal on July 24, 2026 ### Claude Platform release notes — June 22, 2026 - Date: 2026-06-22 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-22-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-0b60ed21 MCP tunnels (research preview): the management API moved from /v1/organizations/tunnels on the Admin API to /v1/tunnels on the Claude API. The new surface uses the anthropic-beta: mcp-tunnels-2026-06-… - **changed** — MCP tunnels management API moved from /v1/organizations/tunnels on the Admin API to /v1/tunnels on the Claude API - **changed** — MCP tunnels now use the anthropic-beta: mcp-tunnels-2026-06-… header ### Claude Platform release notes — June 18, 2026 - Date: 2026-06-18 - Original notes: https://platform.claude.com/docs/en/release-notes/overview#june-18-2026 - Permalink: https://whatsnew.fyi/product/claude-platform/releases/feed-https-platform.claude.com-docs-en-release-notes-overvie-61e38ef3 The Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now include support for code_execution_20260120 , the code execution tool version that adds REPL state persistence and is the minimum version f… - **added** — Python, TypeScript, Go, Java, Ruby, PHP, and C# SDKs now include support for code_execution_20260120 tool version with REPL state persistence