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
Unknown Agent
4
Incidents
8.5
Avg Severity
3
Critical
0
High
Top Failure Modes
Security Vulnerability
3
Infinite Loop
1
Worst Incident
STUPID-2026-0022 10/10AI vibe-coded Next.js app pinned vulnerable dependency — cryptominer compromised production server
Comparison Summary
| Metric | Claude | Unknown Agent |
|---|---|---|
| Total Incidents | 2 | 4 |
| Avg Severity | 1.8/10 | 8.5/10 |
| Critical Incidents | 0 | 3 |
| Top Failure Mode | Other | Security Vulnerability |
Frequently Asked Questions
Is Claude or Unknown Agent more reliable?
Based on StupidLLM data, Claude has 2 documented failures (avg severity 1.8/10) while Unknown Agent has 4 (avg severity 8.5/10). Claude shows better reliability based on average severity scores.
What are the main differences between Claude and Unknown Agent failures?
Claude's most common failure mode is other, while Unknown Agent most commonly fails via security vulnerability. Claude has 0 critical incidents vs Unknown Agent's 3.