Claude Code core

This release addresses an issue related to how Claude Sonnet 5 sessions handle system roles during conversations. Specifically, harness reminders will no longer incorrectly utilize the mid-conversation system role.

This release focuses primarily on stability and reliability improvements. Users can expect a more robust experience due to the resolution of several underlying issues.

This release introduces the `enforceAvailableModels` managed setting, which tightens security by ensuring the Default model respects the configured `availableModels` allowlist. If the default model is disallowed, it now gracefully falls back to the first available model.

This release focuses on stability and compatibility for Fable 5 users by correctly handling model name suffixes. Additionally, a misleading startup warning related to sandbox dependencies on Windows has been resolved.

This release focuses primarily on stability and reliability improvements. Users should experience fewer unexpected issues and a more robust coding environment.

This release focuses primarily on stability and reliability improvements. Users should experience fewer unexpected issues and a more robust coding environment.

This release focuses primarily on stability and reliability improvements. Users should experience fewer unexpected issues and a more robust coding environment.

This release focused entirely on internal infrastructure improvements and contains no user-facing changes or new features.

This release focused entirely on internal infrastructure improvements and contains no user-facing changes or new features.

This release addresses a specific authentication issue related to the CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS environment variable. Users will no longer encounter a 401 retry loop during OAuth authentication when this setting is active.

This release focuses on stability by resolving an availability error encountered when using auto mode with the claude-opus-4-7 model. No new features or general improvements were introduced in this update.

This release focuses on enhancing the user experience by refining the extended-thinking indicator. Users will now see a rotating progress hint during extended thinking processes.

This release focuses on improving the user experience during long operations by providing thinking hints sooner. There are no major new features or bug fixes noted in this update.

This release focuses on a critical fix for message delivery within the Cowork Dispatch system. Users should now see reliable message transmission in that module.

This release focuses on expanding access to the Remote Control feature for more users. No other specific features or fixes were detailed in these notes.

This release focuses on stability, specifically addressing a critical bug where the BashTool failed on Windows systems due to an EINVAL error. Users on Windows should now experience reliable operation of the BashTool.

This release focuses on a specific functional fix related to command availability. Users will find that the /fast command is now immediately accessible after enabling the /extra-usage setting.

This release introduces the availability of Fast mode for the Opus 4.6 model, allowing users to leverage quicker processing capabilities. More details on this new mode can be found in the linked documentation.

This release focuses on stability and performance improvements. The primary change addresses slow startup times experienced when resuming sessions that utilize saved hook context.

This release focuses on stability and compatibility by addressing a critical issue. The primary change is a fix that prevents crashes on older processors lacking AVX instruction support.

This release introduces a new environment variable, CLAUDE_CODE_TMPDIR, which allows users to specify a custom temporary directory for internal processing files. This is particularly useful for environments with specific temporary storage requirements.

This release introduces a new environment variable, CLAUDE_CODE_DISABLE_BACKGROUND_TASKS, giving users granular control to disable background tasks entirely. Additionally, a critical bug affecting the "Help improve Claude" setting fetch due to stale OAuth tokens has been resolved.

This release addresses a specific technical issue related to code signing on macOS when using the Claude integration within the Chrome browser. Users should no longer encounter the code-sign warning.