# Gemini Pro Custom Tools

> Gemini Pro Custom Tools, a family of models by Google, listed from OpenRouter. Indexed, not reviewed: facts and our own checks, no score or ranking. Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of…

- Canonical: https://www.anchorterminal.com/tools/gemini-pro-custom-tools
- Markdown: https://www.anchorterminal.com/tools/gemini-pro-custom-tools.md (~500 tokens)
- Slim: https://www.anchorterminal.com/tools/gemini-pro-custom-tools.min.md (~430 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/tools/gemini-pro-custom-tools.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

# Gemini Pro Custom Tools

> Indexed, not reviewed: facts from OpenRouter and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: model family, by Google
- Category: Model APIs & inference (https://www.anchorterminal.com/categories/inference.md)
- Listed because: OpenRouter lists it, with prices from the providers that serve it.
- What OpenRouter says: 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...

## Models (1)

| Model | OpenRouter id | Released | Context | Input $/1M | Output $/1M | Supports |
| --- | --- | --- | --- | --- | --- | --- |
| Gemini 3.1 Pro Preview Custom Tools | `google/gemini-3.1-pro-preview-customtools` | 2026-02 | 1.05M | $2 | $12 | tools, structured output, reasoning, caching, audio, file, image, video |

Prices and limits as OpenRouter lists them; a provider's own price can differ.

- JSON: https://www.anchorterminal.com/api/v1/tools/gemini-pro-custom-tools.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming