Is Codex or Devin more reliable?

Based on StupidLLM's incident database, Codex has 3 documented failures (avg severity 5.8/10) while Devin has 10 (avg severity 3.9/10). Devin shows better reliability.

What are the main differences between Codex and Devin failures?

Codex's most common failure mode is Destructive Action, while Devin most commonly fails via Scope Explosion. Codex has 0 critical incidents vs Devin's 1.

Which has more critical-severity failures?

Devin has more critical failures (1 vs 0), indicating a higher likelihood of severe, production-impacting incidents.

Should I use Codex or Devin for production code?

Devin has a lower average failure severity (3.9/10 vs 5.8/10), 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?

Codex has 2 verified incidents out of 3 total, while Devin has 10 verified out of 10. Verified incidents are confirmed against source evidence.

Head to head

Codex vs Devin

Comparing 3 documented Codex incidents against 10 for Devin.

Full Codexreport →Full Devinreport →

Verdict

Devin has the lower average failure severity (3.9/10 vs 5.8/10), making it the statistically safer choice of the two — though both agents have documented critical incidents.