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
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 | Cursor |
|---|---|---|
| Total Incidents | 2 | 5 |
| Avg Severity | 1.8/10 | 6.1/10 |
| Critical Incidents | 0 | 2 |
| Top Failure Mode | Other | Security Vulnerability |
Frequently Asked Questions
Is Claude or Cursor more reliable?
Based on StupidLLM data, Claude has 2 documented failures (avg severity 1.8/10) while Cursor has 5 (avg severity 6.1/10). Claude shows better reliability based on average severity scores.
What are the main differences between Claude and Cursor failures?
Claude's most common failure mode is other, while Cursor most commonly fails via security vulnerability. Claude has 0 critical incidents vs Cursor's 2.