API price
GPT-5.1 API price
By OpenAI. $1.25 per million input tokens, $10.00 per million output tokens on OpenRouter. Collected November 12, 2026.
- $1.25
- $10.00
- 400,000
- —
- November 13, 2025
- August 22, 2026
Last 90 days
Price changes
No price change in this window.
What the numbers say
- Input costs less than 27% of the 443 paid models we track.
Closest in price
- Gemini 2.5 Pro$1.25 / $10.00
- Gemini 2.5 Pro Preview 06-05$1.25 / $10.00
- Muse Spark 1.1$1.25 / $4.25
- Muse Spark 1.2$1.25 / $4.25
- Muse Spark 1.3$1.25 / $4.25
- Muse Spark Open$1.25 / $4.25