AI model · Google
Gemini 3.1 Pro Preview Custom Tools
Model ID: google/gemini-3.1-pro-preview-customtools
- Input
- $2 per 1M tokens
- Output
- $12 per 1M tokens
- Context
- 1M tokens at once
- Max output
- 66K tokens per reply
- Released
- 25 Feb 2026 Google
What it can do
- YesReasoning
- YesTool calling
- YesImage input
- NoOpen weights
- NoFree to use
Takes text, audio, image, video, file; gives text.
How its listing describes it
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...
Sources
- Google: Gemini 3.1 Pro Preview Custom Tools on OpenRouter — read 2 Oct 2026