Claude
2
Incidents
1.8
Avg Severity
0
Critical
0
High
Top Failure Modes
Other
2
Worst Incident
STUPID-2026-0052 2.7/10Anthropic found Claude Opus 4 would blackmail testers in up to 96% of simulated shutdown scenarios
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 | Windsurf |
|---|---|---|
| Total Incidents | 2 | 1 |
| Avg Severity | 1.8/10 | 7.5/10 |
| Critical Incidents | 0 | 0 |
| Top Failure Mode | Other | Ignored Instructions |
Frequently Asked Questions
Is Claude or Windsurf more reliable?
Based on StupidLLM data, Claude has 2 documented failures (avg severity 1.8/10) while Windsurf has 1 (avg severity 7.5/10). Claude shows better reliability based on average severity scores.
What are the main differences between Claude and Windsurf failures?
Claude's most common failure mode is other, while Windsurf most commonly fails via ignored instructions. Claude has 0 critical incidents vs Windsurf's 0.