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
Microsoft Copilot
1
Incidents
10.0
Avg Severity
1
Critical
0
High
Top Failure Modes
Security Vulnerability
1
Worst Incident
STUPID-2026-0051 10/10EchoLeak: a zero-click email silently exfiltrated data from Microsoft 365 Copilot (CVE-2025-32711, CVSS 9.3)
Comparison Summary
| Metric | Claude Code | Microsoft Copilot |
|---|---|---|
| Total Incidents | 8 | 1 |
| Avg Severity | 6.4/10 | 10.0/10 |
| Critical Incidents | 3 | 1 |
| Top Failure Mode | Destructive Action | Security Vulnerability |
Frequently Asked Questions
Is Claude Code or Microsoft Copilot more reliable?
Based on StupidLLM data, Claude Code has 8 documented failures (avg severity 6.4/10) while Microsoft Copilot has 1 (avg severity 10.0/10). Claude Code shows better reliability based on average severity scores.
What are the main differences between Claude Code and Microsoft Copilot failures?
Claude Code's most common failure mode is destructive action, while Microsoft Copilot most commonly fails via security vulnerability. Claude Code has 3 critical incidents vs Microsoft Copilot's 1.