I checked 10 AI-written patches to real C++ projects – 6 didn't hold up
Reruns AI-written C/C++ fixes on real hardware to prove the bug is actually gone
Unfix independently verifies AI-written fixes for C and C++ bugs, including firmware. It rebuilds the project, confirms the bug fails every run, applies the patch, reruns the tests with sanitizers on, then reverts the fix to check the bug comes back — giving one of three verdicts: VERIFIED, REJECTED, or NOT VERIFIABLE. It also scans the diff for disabled sanitizers, weakened assertions, and added delays that could fake a pass. Ships as a GitHub Action, an MCP tool for Claude Code and Codex, and a terminal app.
What holds up
- +Eight independent checks run live on real hardware, not a log replay or a mock
- +Verdict comes from reverting the fix and watching the bug return, not just one test rerun
- +Anti-masking scan flags disabled sanitizers, weakened asserts, and added delays in the diff
- +Works as a GitHub Action, an MCP tool, or a terminal command — fits existing workflows
Mind the limits
- −PR checks run only in Unfix's own demo repo so far — not yet wired into your real project
- −Still at the 'become a design partner' stage, with no general release or pricing shown
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