Gemini 3.1 Pro Preview Custom Tools vs GPT-5.3 Codex
Gemini 3.1 Pro Preview Custom Tools is cheaper on output tokens, while Gemini 3.1 Pro Preview Custom Tools offers a larger context window. Choose Gemini 3.1 Pro Preview Custom Tools or GPT-5.3 Codex based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Gemini 3.1 Pro Preview Custom Tools | GPT-5.3 Codex |
|---|---|---|
| Provider | OpenRouter | OpenRouter |
| Input / 1M tokens | $2.00 | $1.75 |
| Output / 1M tokens | $12.00 | $14.00 |
| Context window | 1M | 400K |
| Parameters | — | — |
| Open weights | No | No |
| Released | Feb 2026 | Feb 2026 |
FAQ
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.