Model release · Google

gemini-3.1-pro-preview

Model released: Feb 19, 2026 · Date only

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)

Customize my briefingMarkdown

Source trace

Reviewed by Ailyre. Source evidence is presented separately from our summary.

ai.google.dev

ai.google.dev

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