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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.
Price/1M
$4.50
612th cheapest
1352% above median
Top 91%
Context Window
1.0M
8th largest
Top 6%
Input
$2.00
per 1M tokens
Output
$12.00
per 1M tokens
Blended
$4.50
per 1M tokens
Cheaper than 9% of models. Median price is $0.31/1M tokens.
Daily
$4.50
Monthly
$135.00
Context Window
1.0M
tokens
Larger than 94% of models
Max Output
66K
tokens
6% of context
Context Window Comparison