GPT-5.1-Codex-Max vs GPT-5.4 Pro
GPT-5.1-Codex-Max is cheaper on output tokens, while GPT-5.4 Pro offers a larger context window. Choose GPT-5.1-Codex-Max or GPT-5.4 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | GPT-5.1-Codex-Max | GPT-5.4 Pro |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Input / 1M tokens | $1.25 | $30.00 |
| Output / 1M tokens | $10.00 | $180.00 |
| Context window | 400K | 1.1M |
| Parameters | — | — |
| Open weights | No | No |
| Released | Nov 2025 | Mar 2026 |
| LiveBench score | 74.4 | — |
| GPQA Diamond score | — | 94.6 |
| FrontierMath score | — | 50.0 |
| Epoch Capabilities Index score | — | 160 |
FAQ
Is GPT-5.1-Codex-Max or GPT-5.4 Pro cheaper?
GPT-5.1-Codex-Max is cheaper on output tokens ($10.00 vs $180.00 per 1M).
Which has the larger context window, GPT-5.1-Codex-Max or GPT-5.4 Pro?
GPT-5.4 Pro has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.