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Anthropic Release Notes

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Last updated: Dec 5, 2025

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All Anthropic Release Notes

  • Dec 4, 2025
    • Parsed from source:
      Dec 4, 2025
    • Detected by Releasebot:
      Dec 5, 2025
  • Dec 4, 2025
    • Parsed from source:
      Dec 4, 2025
    • Detected by Releasebot:
      Dec 5, 2025
    Anthropic logo

    Anthropic API by Anthropic

    December 4, 2025

    Structured outputs now supports Claude Haiku 4.5.

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  • December 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Dec 6, 2025
    Anthropic logo

    Claude Code by Anthropic

    2.0.60

    • Added background agent support. Agents run in the background while you work

    • Added --disable-slash-commands CLI flag to disable all slash commands

    • Added model name to "Co-Authored-By" commit messages

    • Enabled "/mcp enable [server-name]" or "/mcp disable [server-name]" to quickly toggle all servers

    • Updated Fetch to skip summarization for pre-approved websites

    • VSCode: Added support for multiple terminal clients connecting to the IDE server simultaneously

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  • December 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Dec 5, 2025
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    Claude Code by Anthropic

    2.0.59

    • Added --agent CLI flag to override the agent setting for the current session

    • Added agent setting to configure main thread with a specific agent's system prompt, tool restrictions, and model

    • VS Code: Fixed .claude.json config file being read from incorrect location

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  • December 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Dec 4, 2025
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    Claude Code by Anthropic

    2.0.58

    Release Notes

    • Pro users now have access to Opus 4.5 as part of their subscription!
    • Fixed timer duration showing "11m 60s" instead of "12m 0s"
    • Windows: Managed settings now prefer C:\Program Files\ClaudeCode if it exists. Support for C:\ProgramData\ClaudeCode will be removed in a future version.
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  • December 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Dec 3, 2025
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    Claude Code by Anthropic

    2.0.57

    Release notes

    • Added feedback input when rejecting plans, allowing users to tell Claude what to change
    • VSCode: Added streaming message support for real-time response display
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  • December 2025
    • No date parsed from source.
    • Detected by Releasebot:
      Dec 2, 2025
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    Claude Code by Anthropic

    2.0.56

    Release notes

    • Added setting to enable/disable terminal progress bar (OSC 9;4)

    • VSCode Extension: Added support for VS Code's secondary sidebar (VS Code 1.97+), allowing Claude Code to be displayed in the right sidebar while keeping the file explorer on the left. Requires setting sidebar as Preferred Location in the config.

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  • Nov 24, 2025
    • Parsed from source:
      Nov 24, 2025
    • Detected by Releasebot:
      Nov 25, 2025
    Anthropic logo

    Anthropic API by Anthropic

    November 24, 2025

    Claude Opus 4.5 debuts with stronger intelligence and practical performance for complex tasks at a friendlier price. Public beta brings programmatic tool calling and on‑demand tool search to speed up multi-tool workflows. A new effort parameter and SDK client-side compaction auto‑manage context for faster responses.

    Release notes

    • 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 our Models & Pricing documentation.
    • 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.
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  • Nov 24, 2025
    • Parsed from source:
      Nov 24, 2025
    • Detected by Releasebot:
      Nov 25, 2025
    Anthropic logo

    Claude by Anthropic

    November 24, 2025

    Claude Opus 4.5 debuts as the most powerful frontier model. Claude for Excel enters beta with pivot tables, charts, file uploads and a quick-launch shortcut. Context window compaction enables longer conversations by summarizing older messages.

    Claude Opus 4.5 launch

    We released our most powerful frontier model to date. Read our blog post for more information: Introducing Claude Opus 4.5.

    Claude for Excel beta release

    Claude for Excel is now available in beta to all Max, Team, and Enterprise users. We’ve added some additional capabilities, such as support for pivot tables, charts and file uploads, plus a shortcut to quickly open the full Claude app from Excel (ctrl+option+c). We've also made overall improvements to performance, speed, context management, and the general user experience. See Claude for Excel.

    Context window compaction

    We’ve changed our context window functionality to enable infinite-length conversations (with some exceptions) and significantly reduce length limit errors by summarizing earlier messages when a chat approaches its context limit. Read more here: Understanding Usage and Length Limits.

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  • Nov 24, 2025
    • Parsed from source:
      Nov 24, 2025
    • Detected by Releasebot:
      Nov 25, 2025
    Anthropic logo

    Claude Apps by Anthropic

    November 24, 2025

    Claude Opus 4.5 debuts as our most capable frontier model. Claude for Excel enters beta with pivot tables, charts, file uploads and a quick open shortcut, plus performance boosts. Context window compaction enables longer conversations by summarizing earlier messages.

    Claude Opus 4.5 launch

    We released our most powerful frontier model to date. Read our blog post for more information: Introducing Claude Opus 4.5.

    Claude for Excel beta release

    Claude for Excel is now available in beta to all Max, Team, and Enterprise users. We’ve added some additional capabilities, such as support for pivot tables, charts and file uploads, plus a shortcut to quickly open the full Claude app from Excel (ctrl+option+c). We've also made overall improvements to performance, speed, context management, and the general user experience. See Claude for Excel.

    Context window compaction

    We’ve changed our context window functionality to enable infinite-length conversations (with some exceptions) and significantly reduce length limit errors by summarizing earlier messages when a chat approaches its context limit. Read more here: Understanding Usage and Length Limits.

    Original source Report a problem

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