Gemini 3.1 Pro Preview Custom Tools
google/gemini-3.1-pro-preview-customtools-20260219
Usage data date 2026-07-26 · updated daily
Usage and specs
What is 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.
Gemini 3.1 Pro Preview Custom Tools capabilities
Input: Text、Audio、Image、Video、File Output: Text
Gemini 3.1 Pro Preview Custom Tools API pricing
List prices in USD; see each provider’s site for current terms.
Tools built on this model
Google Gemini
Most useful for people already working in Google services, with plan limits and data permissions worth checking first.
Google AI
Best for self-taught learners and developers who want to connect AI study with hands-on practice; not for learners needing systematic Chinese-language instruction.
Imagen
Best for researchers, engineers, and technology decision-makers tracking text-to-image progress; not for casual users who want to generate images right away.
Gemini
Best for users embedded in the Google ecosystem who need multimodal and automation power; not suitable for users in restricted regions or those who avoid Google services.
PaLM 2
Suited to AI developers, researchers, and enterprise teams in the Google ecosystem; not for everyday users seeking a ready-made consumer chatbot.