Gemini 3.1 Pro vs GPT-5.3 Codex
GPT-5.3 Codex reads a 26.2K-token pull request for $0.0459, 13% less than Gemini 3.1 Pro ($0.0524). Both sit in the mid-range price tier, so the choice between them is about review quality more than budget.
Side by side
| Figure | Gemini 3.1 Pro | GPT-5.3 Codex |
|---|---|---|
| Price tier | Mid-range | Mid-range |
| Bugs caughtshare of known bugs | 67% | – |
| False alarmsper clean PR | 0.8 | – |
| Cost per reviewmeasured | $0.2499 | – |
| Cost per bug caught | $0.4134 | – |
| Exact linecatches on the expected lines | 89% | – |
| Review timemean | 349s | – |
| Typical review calllist price | $0.0814 | $0.0797 (better) |
| Input / 1M tokens | $2.00 | $1.75 (better) |
| Output / 1M tokens | $12.00 (better) | $14.00 |
| Context window | 1M | 400K |
Not benchmarked yet
GPT-5.3 Codex isn't benchmarked yet, so this page compares list prices only. Measured bugs caught, false alarms and a bug-by-bug comparison appear here once both have results.
See measured models