API price
Gemini 3.1 Pro Preview Custom Tools API price
By Google. $2.00 per million input tokens, $12.00 per million output tokens on OpenRouter. Collected November 12, 2026.
- $2.00
- $12.00
- 1,048,576
- —
- February 25, 2026
- August 22, 2026
Last 90 days
Price changes
No price change in this window.
What the numbers say
- Input costs less than 16% of the 443 paid models we track.
Closest in price
- Claude Opus 5.5 (batch)$2.00 / $10.00
- Claude Sonnet 5$2.00 / $10.00
- Claude Sonnet 5.5$2.00 / $10.00
- Nano Banana Pro (Gemini 3 Pro Image)$2.00 / $12.00
- Nano Banana Pro (Gemini 3 Pro Image Preview)$2.00 / $12.00
- Gemini 3.1 Pro Preview$2.00 / $12.00