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AI release notes

Anthropic's official release notes. Claude apps: the website, desktop and phone apps. Claude Code: Claude's coding assistant. Claude API: what developers use to build Claude into their own products.

Compiled by the Toolstash team · Updated

  1. Claude Code

    Claude Code 2.1.58

    1 other

    Expand Remote Control to more users.

  2. Claude Code

    Claude Code 2.1.56

    1 other

    VS Code: Fixed another cause of "command 'claude-vscode.editor.openLast' not found" crashes.

  3. Claude Code

    Claude Code 2.1.55

    1 fix

    Fixed BashTool failing on Windows with EINVAL error.

  4. Claude Code

    Claude Code 2.1.53

    8 fixes

    Fixed a UI flicker where user input would briefly disappear after submission before the message rendered. Fixed bulk agent kill (ctrl+f) to send a single aggregate notification instead of one per agent, and to properly clear the command queue.

  5. Claude apps

    Scheduled tasks in Cowork

    We introduced the ability to create and schedule both recurring and on-demand tasks in Cowork, as well as a new Customize section in Claude Desktop that groups skills, plugins, and connectors in one place.

  6. Claude Code

    Claude Code 2.1.52

    1 other

    VS Code: Fixed extension crash on Windows ("command 'claude-vscode.editor.openLast' not found").

  7. Claude Code

    Claude Code 2.1.51

    3 new4 fixes5 other

    Added claude remote-control subcommand for external builds, enabling local environment serving for all users. Added support for custom npm registries and specific version pinning when installing plugins from npm sources.

  8. Claude apps

    Cowork plugins and admin controls, plus 2 more changes

    We launched a new plugin marketplace and admin controls for Team and Enterprise plans.

  9. Claude Code

    Claude Code 2.1.50

    6 new14 fixes5 other

    Added support for startupTimeout configuration for LSP servers. Added WorktreeCreate and WorktreeRemove hook events, enabling custom VCS setup and teardown when agent worktree isolation creates or removes worktrees.

  10. Claude Code

    Claude Code 2.1.49

    1 new9 fixes10 other

    Added ConfigChange hook event that fires when configuration files change during a session, enabling enterprise security auditing and optional blocking of settings changes.

  11. Claude API

    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 Automatic 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.

  12. Claude Code

    Claude Code 2.1.47

    3 new53 fixes12 other

    Added last_assistant_message field to Stop and SubagentStop hook inputs, providing the final assistant response text so hooks can access it without parsing transcript files. Added chat:newline keybinding action for configurable multi-line input (anthropics/claude-code#26075).

  13. Claude Code

    Claude Code 2.1.45

    4 new7 fixes4 other

    Added support for Claude Sonnet 4.6. Added support for reading enabledPlugins and extraKnownMarketplaces from --add-dir directories.

  14. Claude API

    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.

  15. Claude appsAnnouncement

    Claude Sonnet 4.6 launch

    We launched our most capable Sonnet model yet, with a full upgrade of the model’s skills across coding, computer use, long-context reasoning, agent planning, knowledge work, and design. Sonnet 4.6 also features a 1M token context window in beta. Read our blog post for more information: Introducing Claude Sonnet 4.6.

  16. Claude Code

    Claude Code 2.1.44

    1 fix

    Fixed auth refresh errors.

  17. Claude Code

    Claude Code 2.1.42

    2 fixes1 other

    Fixed /resume showing interrupt messages as session titles. Fixed Opus 4.6 launch announcement showing for Bedrock/Vertex/Foundry users.

  18. Claude Code

    Claude Code 2.1.41

    2 new11 fixes2 other

    Added claude auth login, claude auth status, and claude auth logout CLI subcommands. Added Windows ARM64 (win32-arm64) native binary support.

  19. Claude apps

    Analytics API for Enterprise plans

    The Enterprise Analytics API provides programmatic access to usage and engagement data for Claude and Claude Code Remote usage within your organization. Data is aggregated per organization, per day, and each endpoint returns a snapshot for a single date that you specify.

  20. Claude appsAnnouncement

    Self-serve Enterprise plans

    Previously, Enterprise plans were only available to customers working with our Sales team. Now, any organization can purchase an Enterprise plan directly on our website with no Sales conversation required. Self-serve Enterprise plans have a single seat type that includes access to Claude, Claude Code, and Cowork.

  21. Claude Code

    Claude Code 2.1.39

    4 fixes1 other

    Improved terminal rendering performance. Fixed fatal errors being swallowed instead of displayed.

  22. Claude Code

    Claude Code 2.1.38

    5 fixes2 other

    Fixed VS Code terminal scroll-to-top regression introduced in 2.1.37. Fixed Tab key queueing slash commands instead of autocompleting.

  23. Claude Code

    Claude Code 2.1.37

    1 fix

    Fixed an issue where /fast was not immediately available after enabling /extra-usage.

  24. Claude Code

    Claude Code 2.1.36

    1 other

    Fast mode is now available for Opus 4.6. Learn more at https://code.claude.com/docs/en/fast-mode.

  25. Claude API

    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.

  26. Claude Code

    Claude Code 2.1.34

    2 fixes

    Fixed a crash when agent teams setting changed between renders. Fixed a bug where commands excluded from sandboxing (via sandbox.excludedCommands or dangerouslyDisableSandbox) could bypass the Bash ask permission rule when autoAllowBashIfSandboxed was enabled.

  27. Claude Code

    Claude Code 2.1.33

    6 new8 fixes2 other

    Added TeammateIdle and TaskCompleted hook events for multi-agent workflows. Added support for restricting which sub-agents can be spawned via Task(agent_type) syntax in agent "tools" frontmatter.

  28. Claude Code

    Claude Code 2.1.32

    3 new3 fixes6 other

    Added research preview agent teams feature for multi-agent collaboration (token-intensive feature, requires setting CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1). Added "Summarize from here" to the message selector, allowing partial conversation summarization.

  29. Claude API

    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.

  30. Claude appsAnnouncement

    Claude Opus 4.6 launch, plus 2 more changes

    We’ve upgraded our smartest model and improved its coding skills. Read our blog post for more information: Introducing Claude Opus 4.6. Claude is now available as an add-in for PowerPoint. Read more here: Use Claude for PowerPoint.