Side-by-side comparison of pricing, 12 benchmarks, and generation speed.
| Metric | GPT-5.1 Codex (high) | Gemini 2.5 Pro |
|---|---|---|
| Input ($/M tokens) | $1.25 | $1.25 |
| Output ($/M tokens) | $10 | $10 |
Data from Artificial Analysis API — 12 benchmarks
Both models have similar pricing. Check the detailed breakdown above for input vs output token costs.
GPT-5.1 Codex (high) wins 9 out of 12 benchmarks compared to 3 for Gemini 2.5 Pro. See the detailed benchmark chart above for per-category results.
GPT-5.1 Codex (high) generates tokens faster at 139 tok/s vs 131 tok/s. GPT-5.1 Codex (high) also has lower time-to-first-token (7.13s vs 23.22s).
Choose based on your priorities: both are similarly priced, GPT-5.1 Codex (high) for stronger benchmark performance, and GPT-5.1 Codex (high) for faster generation. For latency-sensitive apps, check the TTFT comparison above.