Google: Gemini 3.1 Pro Preview Custom Tools
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.
Undisclosed
Parameters
1.0M tokens
Context Window
Proprietary
License
Feb 25, 2026
Released
💰 Pricing
Input
$2.00
per 1M tokens
Output
$12.00
per 1M tokens
API Available
This model is accessible via API for integration into your applications.
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