GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
| Provider | openai |
|---|---|
| Input price | $1.25 / 1M tokens |
| Output price | $10.00 / 1M tokens |
| Context window | 400k tokens |
| Max output | 128k tokens |
| Modalities | image, text, file |
| Model ID | openai/gpt-5.1 |
A 1,000-token prompt with a 500-token answer on OpenAI: GPT-5.1 costs roughly $0.00625. 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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