Gemini Omni 1.1 Flash vs GPT-5.1-Codex
Price, context window & benchmark comparison
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Verdict: Gemini Omni 1.1 Flash is 2% cheaper than GPT-5.1-Codex on a typical 3:1 input/output mix. GPT-5.1-Codex has the larger context window (400K vs 131K).
| Gemini Omni 1.1 Flash | GPT-5.1-Codex | |
|---|---|---|
| Input price / 1M | $1.50 | $1.25 |
| Output price / 1M | $9.00 | $10.00 |
| Blended price (3:1) | $3.38 | $3.44 |
| Cached input / 1M | — | $0.13 |
| Context window | 131K | 400K |
| Max output | 66K | 128K |
| Intelligence index | — | — |
| Coding index | — | — |
| Providers | 1 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | No | Yes |
| Released | 2026-11-04 | 2025-11-13 |
| Retirement | — | — |
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FAQ
Which is cheaper, Gemini Omni 1.1 Flash or GPT-5.1-Codex?
Gemini Omni 1.1 Flash is 2% cheaper than GPT-5.1-Codex on a typical 3:1 input/output mix.
Gemini Omni 1.1 Flash vs GPT-5.1-Codex: which has a bigger context window?
Gemini Omni 1.1 Flash: 131,072 tokens. GPT-5.1-Codex: 400,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Gemini Omni 1.1 Flash ≈ $7,500, GPT-5.1-Codex ≈ $7,500.
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