ue [Bug] Anthropic API Error: Message flagged by safeguards with Claude 3.5 Opus
Status Open
Reported on v2.1.280
Maintainer reply None cached
Activity 0 comments · opened Sep 23, 2026
Bug Description
● API Error: Opus 5.5 (1M context)'s safeguards flagged this message (https://www.anthropic.com/legal/aup). This sometimes happens with safe, normal conversations. Claude Code can't respond to this message with Opus 5.5 (1M context).
Environment Info
- Platform: win32
- Terminal: windows-terminal
- Version: 2.1.280
- Feedback ID: 3a7c75a2-3350-4934-a211-0ac8d0bdd9bf
Errors
[{"error":"TelemetrySafeError: VirtualMessageList: itemKeys/messages length desync (keys=436 messages=434 range=[374,436))\n at ST (B:/~BUN/root/chunk-d3e8v9at.js:24:28247)\n at Mc (B:/~BUN/root/chunk-d3e8v9at.js:24:19439)\n at Ys (B:/~BUN/root/chunk-9xhfd67n.js:18:20178)\n at au (B:/~BUN/root/chunk-9xhfd67n.js:18:38344)\n at Ph (B:/~BUN/root/chunk-9xhfd67n.js:18:84425)\n at $g (B:/~BUN/root/chunk-9xhfd67n.js:18:83425)\n at Nu (B:/~BUN/root/chunk-9xhfd67n.js:18:83254)\n at _h (B:/~BUN/root/chunk-9xhfd67n.js:18:79779)\n at dt (B:/~BUN/root/chunk-9xhfd67n.js:18:6261)\n at Qn (B:/~BUN/root/chunk-9xhfd67n.js:18:4792)","timestamp":"2026-09-23T03:00:09.084Z"}]