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
Cursor
5
Incidents
6.1
Avg Severity
2
Critical
0
High
Top Failure Modes
Security Vulnerability
1
Destructive Action
1
Infinite Loop
1
Worst Incident
STUPID-2026-0029 10/10Malicious cloned repository triggered code execution in Cursor on Windows
Comparison Summary
| Metric | Claude Code | Cursor |
|---|---|---|
| Total Incidents | 8 | 5 |
| Avg Severity | 6.4/10 | 6.1/10 |
| Critical Incidents | 3 | 2 |
| Top Failure Mode | Destructive Action | Security Vulnerability |
Frequently Asked Questions
Is Claude Code or Cursor more reliable?
Based on StupidLLM data, Claude Code has 8 documented failures (avg severity 6.4/10) while Cursor has 5 (avg severity 6.1/10). Cursor shows better reliability based on average severity scores.
What are the main differences between Claude Code and Cursor failures?
Claude Code's most common failure mode is destructive action, while Cursor most commonly fails via security vulnerability. Claude Code has 3 critical incidents vs Cursor's 2.