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Claude Code Changelog - Release Notes & Version History
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v2.1.156
Claude Code Release Notes
May 29, 2026
Claude's Analysis
by Sonnet 4.6
Full Analysis
Targeted fix for Opus 4.8 extended thinking: corrupted thinking blocks were triggering API errors.
Change
1
Total Changes (vs Average)
0.1×
Version Type
Patch
Release Focus
Bug Fix
Days Since Prior Release
0
Release # This Month
#24 of 27
Bug Fix Ratio
100%
Post-Release Edits
—
Change Category
Fixed
1
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More Details
1
Opus 4.8 Extended Thinking Hotfix
May Help If You've Noticed
You're using Opus 4.8 with extended thinking enabled and hitting unexpected API errors mid-task.
Changes in Claude Code v2.1.156
Fixed
1 change
•
Fixed an issue when using Opus 4.8 where thinking blocks were modified, leading to API errors.
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