Gemini 3.1 Pro Preview Custom Tools
by Google
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 or user-defined functions are available. This specialized preview endpoint significantly increases function calling reliability and ensures the model selects the most appropriate tool in coding agents and complex, multi-tool workflows. It retains the core strengths of Gemini 3.1 Pro, including multimodal reasoning across text, image, video, audio, and code, a 1M-token context window, and strong software engineering performance.
Specifications
Technical details and pricing.
Benchmarks
7 benchmark scores from Artificial Analysis.
Composite Indices
Intelligence, Coding, Math
Standard Benchmarks
Academic and industry benchmarks
Frequently Asked Questions
What is Gemini 3.1 Pro Preview Custom Tools good for?
Use Gemini 3.1 Pro Preview Custom Tools for everyday tasks like writing, summarizing, brainstorming, and getting clear explanations.
How much does Gemini 3.1 Pro Preview Custom Tools cost?
Pricing is based on usage. Current rates are $2.00/1M tokens for input and $12.00/1M tokens for output.
Can I try Gemini 3.1 Pro Preview Custom Tools for free?
Yes. You can start a chat instantly and test the model before deciding on a plan.
Does Gemini 3.1 Pro Preview Custom Tools support images or audio?
Gemini 3.1 Pro Preview Custom Tools can understand images.
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Benchmarks and pricing are sourced from Artificial Analysis where available. OpenRouter specs are used as a fallback.