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Gemini 3.5 Flash vs GPT-5.1-Codex-Mini
List-price comparison ·Gemini 3.5 Flash details ·GPT-5.1-Codex-Mini details
For a typical workload (100,000 requests / mo), GPT-5.1-Codex-Mini is the cheapest — 80% less than the priciest here ($110.00/mo vs $540.00/mo).
| Gemini 3.5 Flash | GPT-5.1-Codex-Mini | |
|---|---|---|
| Input / 1M tokens | $1.50 | $0.250 |
| Output / 1M tokens | $9.00 | $2.00 |
| Typical request (1,200 in + 400 out) | $0.0054 | $0.0011 |
| Context window | 1,048,576 tokens | 400k tokens |
| Max output | 65,536 tokens | 128k tokens |
| Quality score | 72/100 | 68/100 |
| Tier | Flash | Flash |
| Provider | OpenAI |
Projected monthly cost
| Requests / mo | Gemini 3.5 Flash | GPT-5.1-Codex-Mini |
|---|---|---|
| 1,000 | $5.40 | $1.10 |
| 10,000 | $54.00 | $11.00 |
| 100,000 | $540.00 | $110.00 |
Gemini 3.5 Flash
Fast, cheap multi-modal model with the same 1M-token context as the Pro tier — good for high-volume document Q&A and image/audio triage.
Reasoning quality trails the Pro tier on complex, multi-step tasks; best used where speed and context size matter more than depth.
GPT-5.1-Codex-Mini
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Vendor list rates · per-request examples assume 1,200 input + 400 output tokens.