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.
Input
Output
Context
1049K
Max Output
66K
Parameters
—
Technical Specifications
Model TypeSpeech-to-text
Context Window1.0M
Max Output Tokens66K
Parameters—
Training Cutoff—
Licenseproprietary
Capabilities
Input Modalities
textaudioimagevideofile
Output Modalities
text
Features
function_callingjson_modereasoningspeech_to_textstreamingtext_generationvision
Resources & Links
proprietary — Proprietary - API access only
Related Tools
Data sourced from official provider APIs and documentation
Last updated: May 5, 2026
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