Gemini 3.1 Pro Preview Custom Tools
Gemini 3.1 Pro Preview Custom Tools is a image-generation model from Google, released February 25, 2026. 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...
by Google · 1049K token context window
Best for
- image generation from text
- creative design and ideation
Ways to use Gemini 3.1 Pro Preview Custom Tools in osFoundry
Connect with your own key (BYOK)
Open the key dialog and paste your Google API key. osFoundry discovers Gemini 3.1 Pro Preview Custom Tools automatically — assign it to a Maestro role (router, direct, orchestrator, or fallback) in the Pipeline tab and it is live in every chat. Your key, your provider account — no token markup.
Use it in a Room App
Room Apps declare AI features in their manifest, then call them with invokeAI:
import { invokeAI } from '@osfoundry/app-sdk'
// 'summarize' is an AI feature declared in your app manifest.
const result = await invokeAI('summarize', userText)
Call it from your own apps
Once a model is wired into your workspace you can host it as an API and reach it from your own services, scripts, or CI — outside osFoundry.
Gemini 3.1 Pro Preview Custom Tools vs similar models
| Model | Org | Params | Context | Input price | Self-host |
|---|
| Gemini 3.1 Pro Preview Custom Tools | Google | — | 1049K | $ 2.00 /1M | API only |
| Qwen3.5-Flash | Qwen | — | 1000K | $ 0.065 /1M | API only |
| GPT-5.3-Codex | OpenAI | — | 400K | $ 1.75 /1M | API only |
| Claude Sonnet 4.6 | Anthropic | — | 1000K | $ 3.00 /1M | API only |
Licence
Hosted — usage subject to provider terms — Hosted-only model — usage governed by the provider's API terms. Bring your own provider key.
No weights distributed; usage subject to provider terms.
Frequently asked about Gemini 3.1 Pro Preview Custom Tools
How much does Gemini 3.1 Pro Preview Custom Tools cost?
Gemini 3.1 Pro Preview Custom Tools is metered at $ 2.00 /1M for input, and $ 12.00 /1M for output. Bring your own Google API key — osFoundry passes through provider pricing without markup.
Can I use Gemini 3.1 Pro Preview Custom Tools commercially?
Commercial use is allowed with conditions. Hosted-only model — usage governed by the provider's API terms. Bring your own provider key. No weights distributed; usage subject to provider terms.
What is the context window of Gemini 3.1 Pro Preview Custom Tools?
Gemini 3.1 Pro Preview Custom Tools supports a 1049K token context window.
Can I run Gemini 3.1 Pro Preview Custom Tools locally?
No — Gemini 3.1 Pro Preview Custom Tools is hosted only and accessed via the Google API.
What is Gemini 3.1 Pro Preview Custom Tools best at?
Gemini 3.1 Pro Preview Custom Tools is well-suited to image generation from text, creative design and ideation.
How do I use Gemini 3.1 Pro Preview Custom Tools in osFoundry?
Paste your Google API key in the key dialog (or deploy the open weights for self-hostable models), assign Gemini 3.1 Pro Preview Custom Tools to a Maestro role in the Pipeline tab, then use it in chat, Room Apps via invokeAI, or your own apps.
Published by Google on February 25, 2026. Source: https://openrouter.ai/google/gemini-3.1-pro-preview-customtools