Manus vs Windsurf
AI Agent Reliability Comparison
According to StupidLLM's incident database of 64 documented AI agent failures, Manus has 1 incidents (avg severity 7.5/10) while Windsurf has 1 (avg severity 7.5/10). Here's how these two AI coding agents compare on reliability, failure modes, and real-world risk.
Manus
Top Failure Modes
Worst Incident
STUPID-2026-0063 7.5/10Windsurf
Top Failure Modes
Worst Incident
STUPID-2026-0007 7.5/10Comparison Summary
| Metric | Manus | Windsurf |
|---|---|---|
| Total Incidents | 1 | 1 |
| Avg Severity | 7.5/10 | 7.5/10 |
| Critical Incidents | 0 | 0 |
| Top Failure Mode | Security Vulnerability | Ignored Instructions |
Frequently Asked Questions
Is Manus or Windsurf more reliable?
Based on StupidLLM's incident database, Manus has 1 documented failures (avg severity 7.5/10) while Windsurf has 1 (avg severity 7.5/10). Both agents show similar reliability profiles.
What are the main differences between Manus and Windsurf failures?
Manus's most common failure mode is security vulnerability, while Windsurf most commonly fails via ignored instructions. Manus has 0 critical incidents vs Windsurf's 0.
Which has more critical-severity failures?
Both Manus and Windsurf have 0 critical-severity incidents — the most dangerous category of AI agent failure.
What is the most dangerous failure mode for Manus?
Manus's most frequent failure mode is security vulnerability — its worst documented incident (STUPID-2026-0063) was rated 7.5/10 severity. Understanding these failure patterns helps teams decide whether Manus is safe for their specific use case.
What is the most dangerous failure mode for Windsurf?
Windsurf's most frequent failure mode is ignored instructions — its worst documented incident (STUPID-2026-0007) was rated 7.5/10 severity. Understanding these failure patterns helps teams decide whether Windsurf is safe for their specific use case.
Should I use Manus or Windsurf for production code?
Both agents have similar severity profiles. Your choice should depend on which failure modes are more tolerable for your stack — Manus tends to fail via security vulnerability, while Windsurf fails more often via ignored instructions.
How many verified incidents does each agent have?
Manus has 1 verified incidents out of 1 total, while Windsurf has 1 verified out of 1. Verified incidents are confirmed against source evidence (GitHub PRs, bug reports, news articles), making them the most reliable data points in StupidLLM's database.
How does Manus compare to other AI agents?
StupidLLM tracks 27 AI coding agents. Manus has 1 documented failures — placing it among the higher-risk agents in the database. See the full comparison matrix for context against all tracked agents.
How does Windsurf compare to other AI agents?
StupidLLM tracks 27 AI coding agents. Windsurf has 1 documented failures — placing it among the higher-risk agents in the database. See the full comparison matrix for context against all tracked agents.