# gemini-3.1-pro-preview

Google



Input 1,048,576 / output 65,536; thinking; multimodal reasoning flagship preview; API $2/$12 /1M \(prompt≤200k\); $4/$18 \(\>200k\); includes thinking


## Availability

Gemini API gemini-3.1-pro-preview \(also gemini-3.1-pro-preview-customtools\)
- Model released: Feb 19, 2026 · Date only

## Sources

- Source: https://ai.google.dev/gemini-api/docs/models/gemini-3.1-pro-preview

Canonical entry: https://www.ailyre.com/source/?id=google-deepmind-gemini-3-1-pro-preview&lang=en