Does Gemini 3.1 Pro Preview Custom Tools support zero data retention?

With abuse monitoring, yes. On Google Cloud through the Opper gateway, prompts and outputs are not used for training and are kept only for abuse monitoring.

Where is Gemini 3.1 Pro Preview Custom Tools hosted?

Gemini 3.1 Pro Preview Custom Tools runs on US hosting routes through the Opper gateway.

Is Gemini 3.1 Pro Preview Custom Tools trained on prompts and outputs?

No. Every hosting route for Gemini 3.1 Pro Preview Custom Tools is configured so customer prompts and outputs are not used to train models by default.

Is a GDPR DPA available for Gemini 3.1 Pro Preview Custom Tools?

Yes. A GDPR Data Processing Agreement is available on at least one route serving Gemini 3.1 Pro Preview Custom Tools. Contact hello@opper.ai to receive it.

Gemini 3.1 Pro Preview Custom Tools

by Google

Gemini 3.1 Pro Preview Custom Tools is a specialized variant of Google's Gemini 3.1 Pro designed to improve tool use in complex agentic workflows. It increases function calling reliability and steers the model toward registered custom functions instead of defaulting to a generic bash tool, which makes it well suited to coding agents and multi-tool systems where the model must pick the right tool for each task. With a 1M token context window and strong reasoning, the model retains Gemini 3.1 Pro's multimodal understanding across text, images, video, audio, and code. It is aimed at developers building agents that orchestrate many custom tools and APIs, where consistent and accurate tool selection matters more than raw breadth.

Call Gemini 3.1 Pro Preview Custom Tools on Opper with the OpenAI SDK. Sign up without a credit card. Get started

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Key info

Input

Output

Features

Context window

Max output

66K

Input price

$2.00 /1M

Output price

$12.00 /1M

US residency available
Zero data retention with abuse monitoring
No training by default
GDPR DPA available

Available routes

Gemini 3.1 Pro Preview Custom Tools runs on 1 route through the Opper gateway. Compare residency, zero data retention and training posture at a glance, with full data-handling detail per route below.

Provider	Region	Zero data retention	Training	Input	Output	Cache read
Google Cloud	US		No	$2.00	$12.00	Input price

Uptime and availability

Gemini 3.1 Pro Preview Custom Tools runs on a single route through the Opper gateway today, so its availability is that provider's availability.

99.40%route uptime, last 30 days

Single route, no failover target within this model.

Name a second model in the same request and the gateway tries it on retriable errors, so a busy hour never has to reach your users. Set up a fallback chain.

Measured over the last 30 days from each provider's official status feed via StatusGator. Refreshed hourly. See uptime for every provider Opper monitors.

Data handling per route

Each route hosting Gemini 3.1 Pro Preview Custom Tools has its own privacy posture, residency, and GDPR terms. Postures are maintained by Opper with a last-verification timestamp.

Google Cloud — United States🇺🇸

Zero data retention with abuse monitoring: prompts and outputs are kept for abuse monitoring only, for a window the provider does not state, and are not used for training. No training on customer data. US; SCCs; DPA available.

Zero data retention: With abuse monitoring, window not stated.
Training: No training on customer data.
Logging: Abuse monitoring
Abuse monitoring: On by default, holds flagged content, 55 days, a person can view samples
GDPR DPA: DPA available
Transfer mechanism: SCCs

Get started

Call Gemini 3.1 Pro Preview Custom Tools through the Opper gateway with one API key. Opper is drop-in compatible with the OpenAI, Anthropic and Google AI SDKs.

Gemini 3.1 Pro Preview Custom Tools is a premium model on Opper. Sign up needs no credit card: you get an API key straight away and the free models work in the playground and the API. Add a card to use premium models, pay-as-you-go with no minimum.

Set it up with your agent

Copy this and paste it into a coding agent like Claude Code, Cursor or Codex and it'll wire up Opper for you.

Or call it directly

1import OpenAI from "openai";
2
3const client = new OpenAI({
4  apiKey: process.env.OPPER_API_KEY,
5  baseURL: "https://api.opper.ai/v3/compat",
6});
7
8const completion = await client.chat.completions.create({
9  model: "gemini/gemini-3.1-pro-preview-customtools",
10  messages: [{ role: "user", content: "Hello" }],
11});
12console.log(completion.choices[0].message.content);