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
Gemini Cli
3
Incidents
10.0
Avg Severity
3
Critical
0
High
Top Failure Modes
Security Vulnerability
1
Scope Explosion
1
Destructive Action
1
Worst Incident
STUPID-2026-0027 10/10Gemini CLI silently executed arbitrary code from an untrusted repo (CVE-2026-12537, CVSS 10.0)
Comparison Summary
| Metric | Claude Code | Gemini Cli |
|---|---|---|
| Total Incidents | 8 | 3 |
| Avg Severity | 6.4/10 | 10.0/10 |
| Critical Incidents | 3 | 3 |
| Top Failure Mode | Destructive Action | Security Vulnerability |
Frequently Asked Questions
Is Claude Code or Gemini Cli more reliable?
Based on StupidLLM data, Claude Code has 8 documented failures (avg severity 6.4/10) while Gemini Cli has 3 (avg severity 10.0/10). Claude Code shows better reliability based on average severity scores.
What are the main differences between Claude Code and Gemini Cli failures?
Claude Code's most common failure mode is destructive action, while Gemini Cli most commonly fails via security vulnerability. Claude Code has 3 critical incidents vs Gemini Cli's 3.