GPT-5.1 Codex High vs GPT-5.4 Pro: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Codex High | GPT-5.4 Pro |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | November 11, 2025 | March 1, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 400K | 1.0M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $1.25 | $15.00 |
| Output Price / 1M | $10.00 | $225.00 |
| Average Score | 1.0 | 0.0 |
Verdict
GPT-5.4 Pro leads in 2 out of 3 comparison categories.
API Cost
GPT-5.1 Codex High is 21.3x cheaper: input $1.25/1M vs $15.00/1M tokens.
Context Window
GPT-5.4 Pro supports a larger context: 1M vs 400K tokens.
Recency
GPT-5.4 Pro is newer: released 3/1/2026 vs 11/11/2025.
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The GPT-5.1 Codex High and GPT-5.4 Pro comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.1 Codex High or GPT-5.4 Pro page. See also the complete list of AI model comparisons.