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Anthropic Release Notes

Last updated: Oct 17, 2025

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All Anthropic Release Notes

  • Oct 16, 2025
    • Parsed from source:
      Oct 16, 2025
    • Detected by Releasebot:
      Oct 17, 2025
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    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 16, 2025
    • Parsed from source:
      Oct 16, 2025
    • Detected by Releasebot:
      Oct 18, 2025
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    Claude Apps by Anthropic

    October 16, 2025

    Agent Skills

    Agent Skills are now available on claude.ai. Skills extend Claude’s capabilities with specialized expertise for common tasks. Use pre-built Anthropic-managed Skills in conversations with extended thinking enabled to create and edit documents.

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  • Oct 15, 2025
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      Oct 15, 2025
    • Detected by Releasebot:
      Oct 17, 2025
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    Claude by Anthropic

    October 15, 2025

    Claude Haiku 4.5 launch

    We released our fastest, most cost-efficient model – Claude Haiku 4.5. Our latest small model matches Sonnet 4’s performance on coding, computer use, and agent tasks.

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  • Oct 15, 2025
    • Parsed from source:
      Oct 15, 2025
    • Detected by Releasebot:
      Oct 18, 2025
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    Claude Apps by Anthropic

    October 15, 2025

    We’ve added Claude Haiku 4.5 to claude.ai. Claude Haiku 4.5 is 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.

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  • October 2025
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    • Detected by Releasebot:
      Oct 21, 2025
    A

    Claude Code by Anthropic

    2.0.24

    Release Notes

    • Fixed a bug where project-level skills were not loading when --setting-sources 'project' was specified
    • Claude Code Web: Support for Web -> CLI teleport
    • Sandbox: Releasing a sandbox mode for the BashTool on Linux & Mac
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  • October 2025
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    • Detected by Releasebot:
      Oct 19, 2025
    A

    Claude Code by Anthropic

    2.0.22

    Release notes

    • Fixed content layout shift when scrolling through slash commands
    • IDE: Add toggle to enable/disable thinking.
    • Fix bug causing duplicate permission prompts with parallel tool calls
    • Add support for enterprise managed MCP allowlist and denylist
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  • October 2025
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    • Detected by Releasebot:
      Oct 19, 2025
    A

    Claude Code by Anthropic

    2.0.21

    • Support MCP structuredContent field in tool responses
    • Added an interactive question tool
    • Claude will now ask you questions more often in plan mode
    • Added Haiku 4.5 as a model option for Pro users
    • Fixed an issue where queued commands don't have access to previous messages' output
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  • October 2025
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    • Detected by Releasebot:
      Oct 17, 2025
    A

    Claude Code by Anthropic

    2.0.20

    • Added support for Claude Skills
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  • October 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Oct 17, 2025
    A

    Claude Code by Anthropic

    2.0.19

    • Auto-background long-running bash commands instead of killing them. Customize with BASH_DEFAULT_TIMEOUT_MS

    • Fixed a bug where Haiku was unnecessarily called in print mode

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  • October 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Oct 17, 2025
    A

    Claude Code by Anthropic

    2.0.17

    Release notes

    • Added Haiku 4.5 to model selector!
    • Haiku 4.5 automatically uses Sonnet in plan mode, and Haiku for execution (i.e. SonnetPlan by default)
    • 3P (Bedrock and Vertex) are not automatically upgraded yet. Manual upgrading can be done through setting ANTHROPIC_DEFAULT_HAIKU_MODEL
    • Introducing the Explore subagent. Powered by Haiku it'll search through your codebase efficiently to save context!
    • OTEL: support HTTP_PROXY and HTTPS_PROXY
    • CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC now disables release notes fetching
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