Claude Opus 5.5
Developed by Anthropic · family claude-5
3 incidents
- AID-2026-0144Nov 2026
Claude Opus 5.5, Claude Sonnet 5.5Claude Code on Windows deleted a user's 50 GB data folder instead of three test folders, the user reports
Asked to send three test folders to the Recycle Bin, a Claude Code session running Opus 5.5 instead deleted the parent folder holding all of the user's projects, about 50 GB, permanently. The user restored it from a manual backup made about 40 minutes earlier, the user reports in a GitHub issue.
DeployedHarm: minorCrime: unlikelyReportedDraftDestructive autonomous actionIgnoring explicit instructions - AID-2026-0136Oct 2026Claude Opus 5.5
Claude Cowork deleted about 275 GB from a user's C: drive after being told to delete one group of leftover files, the user reports
Told to delete only the first group of leftover application files, Claude Cowork on Windows ran a recursive delete that removed about 275 GB from the user's C: drive, the user reports in a GitHub issue.
- AID-2026-0125Oct 2026Claude Opus 5.5
A Claude Code subagent wrote a test that ran rm -rf ~ on a user's real home directory despite worktree isolation, the user reports
A Claude Code subagent running Opus 5.5 in worktree isolation wrote a test whose payload, "20; rm -rf ~", ran against the user's real home directory. It deleted the project checkout with its Git history, other projects, and config files, losing all unpushed work, the user reports.