Gemini 3.1 Pro Preview

Name: Gemini 3.1 Pro Preview API
Brand: Google
SKU: gemini-3.1-pro-preview
Price: 2 USD
Availability: InStock

Gemini 3.1 Pro Preview by Google, through an OpenAI-compatible chat completions API.

gemini-3.1-pro-previewGet API key

Pricing USD per million tokens

Tokens	Per 1M tokens
Input	$2.00
Cached input	$2.00
Cache write (5 min)	$2.00
Cache write (1 hour)	$2.00
Output	$12.00

Reasoning tokens are billed as output. Each answer's usage carries cost_usd, the amount taken from your balance; a request with no answer costs $0.00.

Request

curl

curl https://api.revana.si/v1/chat/completions \
  -H "Authorization: Bearer $REVANA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"gemini-3.1-pro-preview","messages":[{"role":"user","content":"Write a haiku about routing."}]}'

Python

import os
from openai import OpenAI

client = OpenAI(base_url="https://api.revana.si/v1", api_key=os.environ["REVANA_API_KEY"])
reply = client.chat.completions.create(
    model="gemini-3.1-pro-preview",
    messages=[{"role": "user", "content": "Write a haiku about routing."}],
)
print(reply.choices[0].message.content)

Any OpenAI SDK works: set the base URL to https://api.revana.si/v1. Streaming, tools and the rest are in the chat completions docs.

Details

Model id

gemini-3.1-pro-preview

Maker

Google

Endpoint

POST /v1/chat/completions

Streaming

Yes (server-sent events)

Routes

1 route

One route today. A request that gets no answer is not charged.

About the Gemini 3.1 Pro Preview API

How much does the Gemini 3.1 Pro Preview API cost?

Gemini 3.1 Pro Preview costs $2.00 per million input tokens, $2.00 per million cached input tokens and $12.00 per million output tokens on Revana. You pay from prepaid credit for the tokens each request used, with no subscription or minimum.

How do I call Gemini 3.1 Pro Preview from code?

Use any OpenAI SDK with base URL https://api.revana.si/v1 and your Revana API key, and set model to "gemini-3.1-pro-preview". POST /v1/chat/completions takes the OpenAI request body, streamed or not.

What happens if a request fails?

A request that gets no answer costs nothing.

Is Gemini 3.1 Pro Preview on Revana the same model?

Yes. Revana passes your request to Google's model unchanged and returns its answer in the OpenAI format, with the usage it reported and what the request cost.