Claude Code v2.1.156 Release Notes

Claude Code v2.1.156 fixes critical API errors when using Opus 4.8 with thinking blocks. Update now for improved stability.

May 29, 2026 • 10 min read • By ClaudeWorld

The Claude Code development team has released version v2.1.156, addressing a critical issue that was affecting users working with Opus 4.8. This maintenance release focuses on stability improvements and ensures seamless API interactions.

What’s New

Bug Fixes

Opus 4.8 Thinking Blocks Fix: This release resolves a significant issue where thinking blocks were being modified when using Opus 4.8, which resulted in API errors and disrupted workflows. Users can now work with thinking blocks in Opus 4.8 without encountering these API-related problems.

This fix is particularly important for power users who rely on Opus 4.8’s advanced reasoning capabilities and thinking blocks for complex code analysis and generation tasks.

How to Update

To update to Claude Code v2.1.156:

  1. Check your current version in the application
  2. Navigate to the update section or restart your application to trigger automatic updates
  3. Verify the update was successful by checking the version number displays as v2.1.156

If you encounter any issues during the update process, please refer to the installation documentation or contact support.