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Claude Code 2.1.156 Hotfix: Fixes Opus 4.8 Thinking Block API Errors

Claude Code Changelogmedium signal

Released May 29, one day after the Opus 4.8 launch, this hotfix addresses an issue where thinking blocks were being modified during Opus 4.8 sessions, causing API errors. A rapid turnaround fix for users who upgraded to 4.8 on day one and hit failures in extended agentic sessions.

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