Head to head

Claude Code vs Codex

Comparing 51 documented Claude Code incidents against 5 for Codex.
Full Claude Codereport →Full Codexreport →

Verdict

Codex has the lower average failure severity (6.8/10 vs 7.0/10), making it the statistically safer choice of the two — though both agents have documented critical incidents.

Reliability metrics for Claude Code and Codex
MetricClaude CodeCodex
Documented incidents515
Average severity7.06.8
Critical111
High192
Verified474

Severity at a glance

Claude Code
7.0medium
Codex
6.8medium

Failure modes

Claude Code
Distribution of failure modes across all documented incidents.
Codex
Distribution of failure modes across all documented incidents.

The incidents behind these numbers

Claude Code

10.0Claude Code wiped DataTalks.Club's production infrastructure — 2.5 years of course data — during an AWS migration10.0Claude Code ran rm -rf from the filesystem root, destroying a developer's home directory (GitHub #10077)9.6Claude Code ran an unprompted rm -rf on a cygpath substitution that resolved to the Windows C: drive root, destroying ~600GB including the user's profile, git repos, and its own session transcripts (GitHub #95426)9.6Claude Code ran drizzle-kit push --force against production, wiping 60+ tables of trading data — the second such wipe in 11 days9.5Claude Code moved files into a log/ subfolder, then rm -rf'd the parent directory containing it — 1,500 files gone (GitHub #49129)

Codex

9.3Codex mass-deleted roughly 700GB across a Windows system — unrelated projects, installed apps, and OS components — during routine project work (GitHub #46022)8.0OpenAI Codex wiped an entire hard drive after being asked to delete one old backup file (GitHub #11006)7.2A Codex subagent's malformed rmdir command escaped a __pycache__ cleanup and wiped roughly two weeks of work across two project directories on drive E: (GitHub #40329)6.0OpenAI Codex ran "rm -rf *" and deleted an entire project after the user pressured it to stop pausing for safety checks (GitHub #6801)3.5OpenAI Codex deleted important project files with no explicit request or confirmation, exact command never captured (GitHub #38312)