GPT-5.1-Codex-Mini is a smaller and faster version of GPT-5.1-Codex
| Provider | openai |
|---|---|
| Input price | $0.250 / 1M tokens |
| Output price | $2.00 / 1M tokens |
| Context window | 400k tokens |
| Max output | 128k tokens |
| Modalities | image, text |
| Model ID | openai/gpt-5.1-codex-mini |
A 1,000-token prompt with a 500-token answer on OpenAI: GPT-5.1-Codex-Mini costs roughly $0.00125. Use the OpenRouter cost calculator to price your own prompt across 400+ models, or the token counter to measure prompt length first.
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