Aider
1
Incidents
6.3
Avg Severity
0
Critical
0
High
Top Failure Modes
Wrong File
1
Worst Incident
STUPID-2026-0005 6.3/10Aider modified wrong file — edited production config instead of dev config
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
Comparison Summary
| Metric | Aider | Claude Code |
|---|---|---|
| Total Incidents | 1 | 8 |
| Avg Severity | 6.3/10 | 6.4/10 |
| Critical Incidents | 0 | 3 |
| Top Failure Mode | Wrong File | Destructive Action |
Frequently Asked Questions
Is Aider or Claude Code more reliable?
Based on StupidLLM data, Aider has 1 documented failures (avg severity 6.3/10) while Claude Code has 8 (avg severity 6.4/10). Aider shows better reliability based on average severity scores.
What are the main differences between Aider and Claude Code failures?
Aider's most common failure mode is wrong file, while Claude Code most commonly fails via destructive action. Aider has 0 critical incidents vs Claude Code's 3.