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
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 | Microsoft Copilot |
|---|---|---|
| Total Incidents | 2 | 1 |
| Avg Severity | 1.8/10 | 10.0/10 |
| Critical Incidents | 0 | 1 |
| Top Failure Mode | Other | Security Vulnerability |
Frequently Asked Questions
Is Claude or Microsoft Copilot more reliable?
Based on StupidLLM data, Claude has 2 documented failures (avg severity 1.8/10) while Microsoft Copilot has 1 (avg severity 10.0/10). Claude shows better reliability based on average severity scores.
What are the main differences between Claude and Microsoft Copilot failures?
Claude's most common failure mode is other, while Microsoft Copilot most commonly fails via security vulnerability. Claude has 0 critical incidents vs Microsoft Copilot's 1.