Gemini 3.1 Pro Preview Custom Tools

Google· released 25 Feb 2026

google/gemini-3.1-pro-preview-customtools

Input / 1M tokens: $2
Output / 1M tokens: $12

Context window1M tokens

Longest answer: 66K tokens

reads textreads audioreads imagereads videoreads filetool callingvisionreasoning

About

Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...

Details

Lab: Googleopenrouter.ai · 3 Oct 2026
Context: 1,049Kopenrouter.ai · 3 Oct 2026
Input price: $2 / 1Mopenrouter.ai · 3 Oct 2026
Output price: $12 / 1Mopenrouter.ai · 3 Oct 2026
Max output: 65,536 tokensopenrouter.ai · 3 Oct 2026
Inputs: text, audio, image, video, fileopenrouter.ai · 3 Oct 2026
Open weights: Noopenrouter.ai · 3 Oct 2026

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Sources

openrouter.ai/google/gemini-3.1-pro-preview-customtoo· checked 3 Oct 2026