| Codex CLI | GitHub Copilot | |
|---|---|---|
| arenaElo | 1408 | 1351 |
| humanEval | 95.5 | 89.9 |
| sweBench | 70 | 55 |
| mmlu | 88.6 | 86.7 |
| gpqa | 60.8 | 55.1 |
| aime | 86 | 80 |
| Price in/out ($/M) | $9 / $36 | $0 / $0 |
Copilot is the low-friction default for IDE users; Codex CLI is the high-ceiling choice for terminal agents. Copilot bills flat; Codex bills per token. Use Copilot for inline suggestions across a team, Codex CLI for autonomous PR generation.