Aider vs Devin
AI Agent Reliability Comparison
According to StupidLLM's incident database of 64 documented AI agent failures, Aider has 1 incidents (avg severity 6.3/10) while Devin has 12 (avg severity 4.9/10). Here's how these two AI coding agents compare on reliability, failure modes, and real-world risk.
Aider
Top Failure Modes
Worst Incident
STUPID-2026-0005 6.3/10Devin
Top Failure Modes
Worst Incident
STUPID-2026-0001 10/10Comparison Summary
| Metric | Aider | Devin |
|---|---|---|
| Total Incidents | 1 | 12 |
| Avg Severity | 6.3/10 | 4.9/10 |
| Critical Incidents | 0 | 3 |
| Top Failure Mode | Wrong File | Scope Explosion |
Frequently Asked Questions
Is Aider or Devin more reliable?
Based on StupidLLM's incident database, Aider has 1 documented failures (avg severity 6.3/10) while Devin has 12 (avg severity 4.9/10). Devin shows better reliability based on average severity scores.
What are the main differences between Aider and Devin failures?
Aider's most common failure mode is wrong file, while Devin most commonly fails via scope explosion. Aider has 0 critical incidents vs Devin's 3.
Which has more critical-severity failures?
Devin has more critical failures (3 vs 0), indicating a higher likelihood of severe, production-impacting incidents.
What is the most dangerous failure mode for Aider?
Aider's most frequent failure mode is wrong file — its worst documented incident (STUPID-2026-0005) was rated 6.3/10 severity. Understanding these failure patterns helps teams decide whether Aider is safe for their specific use case.
What is the most dangerous failure mode for Devin?
Devin's most frequent failure mode is scope explosion — its worst documented incident (STUPID-2026-0001) was rated 10/10 severity. Understanding these failure patterns helps teams decide whether Devin is safe for their specific use case.
Should I use Aider or Devin for production code?
Based on StupidLLM's reliability data, Devin has a lower average failure severity (4.9/10 vs 6.3/10), making it the statistically safer choice for production environments. However, both agents have documented critical incidents — no AI coding agent is risk-free.
How many verified incidents does each agent have?
Aider has 1 verified incidents out of 1 total, while Devin has 12 verified out of 12. 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 Aider compare to other AI agents?
StupidLLM tracks 27 AI coding agents. Aider has 1 documented failures — placing it in the mid-range for reliability. See the full comparison matrix for context against all tracked agents.
How does Devin compare to other AI agents?
StupidLLM tracks 27 AI coding agents. Devin has 12 documented failures — placing it in the mid-range for reliability. See the full comparison matrix for context against all tracked agents.