| GPT-5.4 Codex | Claude Code | |
|---|---|---|
| arenaElo | 1408 | 1420 |
| humanEval | 95.5 | 93.1 |
| sweBench | 70 | 64.3 |
| mmlu | 88.6 | 92.3 |
| gpqa | 60.8 | 65.2 |
| aime | 86 | 88 |
| Price in/out ($/M) | $9 / $36 | $15 / $75 |
Multi-tenant SaaS platforms need PR generation to scale across dozens of forked client instances. GPT-5.4 Codex wins per-PR HumanEval; Claude Code wins on long-session stability across 10+ repos. Alher Tech runs Claude Code at the orchestrator level and GPT-5.4 Codex at the worker level.