Head to head
Aider vs Claude Code
Comparing 5 documented Aider incidents against 49 for Claude Code.
Verdict
Aider has the lower average failure severity (4.5/10 vs 7.1/10), making it the statistically safer choice of the two — though both agents have documented critical incidents.
| Metric | Aider | Claude Code |
|---|---|---|
| Documented incidents | 5 | 49 |
| Average severity | 4.5 | 7.1 |
| Critical | 0 | 11 |
| High | 0 | 19 |
| Verified | 2 | 46 |
Severity at a glance
Aider
4.5
medium
Claude Code
7.1
high
Failure modes
AiderDistribution of failure modes across all documented incidents.
Claude CodeDistribution of failure modes across all documented incidents.
The incidents behind these numbers
Aider
4.8Aider exits with code 0 after a fatal API connection failure, masking hard failures as successful headless runs4.7Aider leaks model-provider API keys to child processes spawned via /run, /test, lint commands, and /git4.6Aider silently discards a model's correct diff response as "no tracked changes" when it guesses the wrong edit format4.4Aider's headless `--message` mode silently swallows slash commands (`/model`, `/ask`, `/architect`) and exits 0 having done nothing4.2Aider's unified-diff coder silently drops the partial-application warning when one hunk succeeds and another fails
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)