# Supercov vs Codex CLI for security review

> Codex CLI finds more vulnerabilities; Supercov answers in 10 seconds for 5¢. Measured on 72 vulnerable repositories, with results by language.

Web page: https://supercov.com/compare/security/codex · Published 2026-09-25
All Supercov pages for agents: https://supercov.com/llms.txt · Full text: https://supercov.com/llms-full.txt

## The difference

Codex CLI reviews a repository as an agent: it reads the code, follows it
across files and writes up what it finds. Supercov runs a fixed set of twelve
security checks on each file. Codex CLI finds far more. Supercov finishes in
seconds instead of minutes, for about 1% of the cost.

## Results

72 deliberately vulnerable repositories, 2,016 labelled vulnerabilities.

| | Supercov 2.0.1 | Codex CLI, GPT Daybreak Blue | Codex CLI, GPT-5.6 Sol | Codex CLI, GPT-6 Astra |
| --- | ---: | ---: | ---: | ---: |
| F1 | 0.42 | 0.71 | 0.70 | 0.49 |
| Finds | 43% | 82% | 79% | 54% |
| Right | 42% | 63% | 62% | 45% |
| Median time | 10 s | 5.4 min | 8.8 min | 6.4 min |
| Cost per repository | 5¢ | $3.78 | $3.87 | $6.99 |

## By language

| F1 | Supercov | GPT Daybreak Blue | GPT-5.6 Sol | GPT-6 Astra |
| --- | ---: | ---: | ---: | ---: |
| Python, 32 repositories | 0.54 | 0.79 | 0.77 | 0.52 |
| TypeScript, 27 | 0.36 | 0.65 | 0.64 | 0.47 |
| JavaScript, 13 | 0.34 | 0.74 | 0.67 | 0.47 |

The newest model is not the most accurate: GPT-6 Astra costs the most and
scores well below GPT Daybreak Blue.

## Choose Codex CLI when

- you want the most complete review you can get, such as before a release;
- a few dollars and several minutes per repository are fine;
- you need problems that span files, like a route missing its authorization
  check. Supercov finds 11% of those.

## Choose Supercov when

- your agent should check every change, and waiting minutes each time is not
  an option;
- you run it across many repositories, where dollars per run add up;
- you want the same twelve checks every time, so results compare run to run.

## Use both

Run Supercov on each change and Codex CLI before a release. See
[Accuracy, speed and cost](https://supercov.com/docs/security-benchmark.md) for how this was measured.


Evidence: [every scanner's results (JSON)](https://supercov.com/downloads/security-benchmark-2026-09-25.json) · [Supercov's reports, timings and scoring script (ZIP)](https://supercov.com/downloads/supercov-security-benchmark-2026-09-25.zip). Measured September 25, 2026 on 72 RealVuln repositories.