Google Gemini 2.5 Pro vs OpenAI GPT-5.1-Codex
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Both cost about the same at a typical 3:1 input/output mix.
- Gemini 2.5 Pro accepts longer prompts: 1M vs 400K tokens.
- GPT-5.1-Codex is the newer model (released 2025-11-13).
| Gemini 2.5 Pro | GPT-5.1-Codex | |
|---|---|---|
| Vendor | OpenAI | |
| Released | 2025-06-17 | 2025-11-13 |
| Input / 1M | $1.25 | $1.25 |
| Output / 1M | $10.00 | $10.00 |
| Cached input / 1M | $0.125 | $0.13 |
| Blended / 1M (3:1) | $3.44 | $3.44 |
| Context | 1M | 400K |
| Max output | 66K | 128K |
| Accepts | text, image, file, audio, video | text, image |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 3 | 1 |
| Cheapest provider, output | $10.00 | $10.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Gemini 2.5 Pro
$225 per month$7.50 per day
GPT-5.1-Codex
$225 per month$7.50 per day
At list prices per 1M tokens; prompt caching and batch discounts are not included.
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