Claude Code
8
Incidents
6.4
Avg Severity
3
Critical
2
High
Top Failure Modes
Destructive Action
3
Other
2
Security Vulnerability
2
Worst Incident
STUPID-2026-0003 10/10Claude Code ran rm -rf on test fixtures thinking they were temp files
Windsurf
1
Incidents
7.5
Avg Severity
0
Critical
1
High
Top Failure Modes
Ignored Instructions
1
Worst Incident
STUPID-2026-0007 7.5/10Windsurf ignored .gitignore and committed node_modules and .env
Comparison Summary
| Metric | Claude Code | Windsurf |
|---|---|---|
| Total Incidents | 8 | 1 |
| Avg Severity | 6.4/10 | 7.5/10 |
| Critical Incidents | 3 | 0 |
| Top Failure Mode | Destructive Action | Ignored Instructions |
Frequently Asked Questions
Is Claude Code or Windsurf more reliable?
Based on StupidLLM data, Claude Code has 8 documented failures (avg severity 6.4/10) while Windsurf has 1 (avg severity 7.5/10). Claude Code shows better reliability based on average severity scores.
What are the main differences between Claude Code and Windsurf failures?
Claude Code's most common failure mode is destructive action, while Windsurf most commonly fails via ignored instructions. Claude Code has 3 critical incidents vs Windsurf's 0.