Claude Fable 5 just crushed a full code audit on one of my repos and it was eye opening.
It surfaced major security issues (injection risks, authz gaps) dozens of correctness bugs, race conditions, silent failures, dead code, and inconsistent patterns, many of which survived multiple rounds of Opus 4.6 and Codex reviews.
Highly recommend running Fable 5 on your codebase while it’s still included in your paid plan. Would’ve easily cost me $100 if billed by usage.
My audit prompt :
Audit this repository thoroughly. Cover:
(1) correctness bugs and race conditions,
(2) security — injection, authz gaps, secrets in code, unsafe deserialization,
(3) error handling and silent failure paths,
(4) performance (N 1 queries, unbounded memory, missing indexes),
(5) dead code and inconsistent patterns.
Read the code deeply, don’t skim. Produce a report grouped by severity with file:line references and a suggested fix for each item.