# Gemini 3.1 Pro Preview Customtools API

Google's Gemini 3.1 Pro Preview Customtools, through an OpenAI-compatible API. Providers quote it on an open exchange, and each request goes to the offer with the lowest estimated charge that meets your rules.

- Providers compete for each request. The exchange ranks the offers that meet your rules by estimated charge. It fixes your maximum charge before the first token, and you pay for the tokens that the model uses.
- The OpenAI and Anthropic APIs. Use the OpenAI or Anthropic SDK that you have. Set the base URL and your key, and send gemini-3.1-pro-preview-customtools as the model.
- Your data rules. Send x-liquid-retention: none and only offers whose provider does not keep your content compete for the request.

## Facts

- Model name: gemini-3.1-pro-preview-customtools
- Maker: Google
- Context window: 200K tokens
- Input price: $1.997 per million tokens
- Output price: $11.981 per million tokens
- Providers: 1 independent provider
- Regions: us

## Providers

- [Architect](https://liquidinference.ai/providers/805445a7-0e40-4c1b-9baf-7b3b01e30e42.md): us, $1.997 input and $11.981 output per million tokens, $0.200 cache read, $0.374 cache write per million tokens, 200K tokens of context

## Request

```sh
curl https://router.inference.ai.exchange/v1/chat/completions \
  -H "Authorization: Bearer $LIQUID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gemini-3.1-pro-preview-customtools",
    "messages": [{"role":"user","content":"Say hello."}]
  }'
```

## Questions

### What is Gemini 3.1 Pro Preview Customtools?

Served by intent-router: each job goes to the cheapest healthy upstream for this model.

### How much does Gemini 3.1 Pro Preview Customtools cost?

Offers now ask $1.997 per million input tokens and $11.981 per million output tokens. A job pays for the tokens it uses. The exchange picks the cheapest eligible offer.

### What is the context length of Gemini 3.1 Pro Preview Customtools?

The largest offer takes 200,000 input tokens. A smaller offer can take less. The exchange skips an offer that cannot take your message.

### What can Gemini 3.1 Pro Preview Customtools do?

Its providers list Audio input, Documents, Vision, Video input, Reasoning effort, JSON object, JSON schema, Frequency penalty, Logit bias, Log probabilities, Min-p sampling, Presence penalty, Repetition penalty, Seed, Stop sequences, Top-k sampling, Top-p sampling, Text, Tools.

### What inputs and outputs does Gemini 3.1 Pro Preview Customtools support?

Text · Audio · Files · Images · Video → Text.

### Which providers serve Gemini 3.1 Pro Preview Customtools?

1 independent provider quote it now, with 1 offer. The table above ranks them by the cost of a typical job.

### How do I call Gemini 3.1 Pro Preview Customtools?

Send "gemini-3.1-pro-preview-customtools" as the model in an OpenAI or Anthropic request. The API section links to setup steps for each client.

### When was Gemini 3.1 Pro Preview Customtools listed?

The exchange first listed it on 10/8/2026. This is not its release date.

## Related pages

- [This page in a browser](https://liquidinference.ai/models/gemini-3.1-pro-preview-customtools)
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- [Set up a client](https://liquidinference.ai/connect/gemini-3.1-pro-preview-customtools)
- [All models](https://liquidinference.ai/models)
- [Providers](https://liquidinference.ai/providers.md)
- [Discover the best model for your budget](https://liquidinference.ai/discover)
- [Quickstart](https://liquidinference.ai/docs/quickstart.md)
- [llms.txt: the index of every page, as Markdown](https://liquidinference.ai/llms.txt)
- [llms-full.txt: every page in one file](https://liquidinference.ai/llms-full.txt)