| Codex CLI | DeepSeek V3 | |
|---|---|---|
| arenaElo | 1408 | 1355 |
| humanEval | 95.5 | 86 |
| sweBench | 70 | 42 |
| mmlu | 88.6 | 88.5 |
| gpqa | 60.8 | 59.1 |
| aime | 86 | 59.4 |
| Price in/out ($/M) | $9 / $36 | $0.27 / $1.1 |
If your B2B SaaS client requires on-prem inference (healthcare, defense, banking), you can't ship runtime features on OpenAI. Use Codex CLI during delivery with OpenAI credentials, then serve end-user AI features on a self-hosted DeepSeek V3. Best of both worlds.