Gemini 3.1 Pro vs GPT-5.1 Codex High: Specs & Benchmark Comparison
| Characteristic | Gemini 3.1 Pro | GPT-5.1 Codex High |
|---|---|---|
| Company | OpenAI | |
| Release Date | February 19, 2026 | November 11, 2025 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 400K |
| Context (output) | 66K | 128K |
| Input Price / 1M | $2.50 | $1.25 |
| Output Price / 1M | $15.00 | $10.00 |
| Average Score | 0.8 | 1.0 |
Verdict
Gemini 3.1 Pro leads in 2 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: Gemini 3.1 Pro — 0.8, GPT-5.1 Codex High — 1.0.
API Cost
GPT-5.1 Codex High is 1.6x cheaper: input $1.25/1M vs $2.50/1M tokens.
Context Window
Gemini 3.1 Pro supports a larger context: 1M vs 400K tokens.
Recency
Gemini 3.1 Pro is newer: released 2/19/2026 vs 11/11/2025.
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Frequently Asked Questions
Which is better for coding — Gemini 3.1 Pro or GPT-5.1 Codex High?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — Gemini 3.1 Pro or GPT-5.1 Codex High?
GPT-5.1 Codex High is cheaper for input: $1.25 per 1M tokens vs $2.50.
Which has a larger context window — Gemini 3.1 Pro or GPT-5.1 Codex High?
Gemini 3.1 Pro supports a larger context: 1,048,576 tokens vs 400,000.
The Gemini 3.1 Pro and GPT-5.1 Codex High comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Gemini 3.1 Pro or GPT-5.1 Codex High page. See also the complete list of AI model comparisons.