google/gemini-3.1-pro-preview-customtools
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.\n\nIt 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.
A public fallback landing page for a model that is not in the live UAI catalog yet.
Pulled from the provider's public model page
Public model metadata
This route exists now, but the model is not active in /v1/models yet
UAI pricing will appear automatically once the catalog row is synced
This page is available for direct linking and discovery, but the row is not active in the live UAI catalog yet. Until it is synced, /v1/models may not list it and requests for google/gemini-3.1-pro-preview-customtools can fail validation.
The same model route, but with one account, one balance, and one API shape.
The synced capabilities for this row indicate image or vision support, so you can route multimodal requests through the same UAI account and billing flow.
Gemini 3.1 Pro Preview Custom Tools is positioned well for chat UIs, demos, and agent loops where faster turn time matters.
Tool and function-style parameters stay available through the same UAI request surface, so agent stacks do not need a separate provider integration.
Public metadata until the live UAI catalog row is synced.
Once this row is synced into UAI, this page will automatically switch from public fallback metadata to live UAI pricing, request validation, and app links.
This public page exists already, but the callable catalog row is still pending sync.
Create a UAI key in API Keys, then use /v1/models or the public models catalog to see which rows are active right now.
google/gemini-3.1-pro-preview-customtools may fail until the live UAI catalog sync includes this row. This page stays up now so the URL can still be shared, indexed, and linked from rankings.
Other active rows to compare without leaving the public catalog.