Github Copilot
4
Incidents
10.0
Avg Severity
4
Critical
0
High
Top Failure Modes
Security Vulnerability
4
Worst Incident
STUPID-2026-0004 10/10Copilot autocompleted AWS credentials into public repository
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 | Github Copilot | Microsoft Copilot |
|---|---|---|
| Total Incidents | 4 | 1 |
| Avg Severity | 10.0/10 | 10.0/10 |
| Critical Incidents | 4 | 1 |
| Top Failure Mode | Security Vulnerability | Security Vulnerability |
Frequently Asked Questions
Is Github Copilot or Microsoft Copilot more reliable?
Based on StupidLLM data, Github Copilot has 4 documented failures (avg severity 10.0/10) while Microsoft Copilot has 1 (avg severity 10.0/10). Both agents show similar reliability profiles.
What are the main differences between Github Copilot and Microsoft Copilot failures?
Github Copilot's most common failure mode is security vulnerability, while Microsoft Copilot most commonly fails via security vulnerability. Github Copilot has 4 critical incidents vs Microsoft Copilot's 1.