GooglePaidOperational

[SP]gemini 3.1 Pro Preview

API model name: [SP]gemini-3.1-pro-preview

[SP]gemini 3.1 Pro Preview is Google's chat model, served on the Api.Airforce unified API. Capabilities include Reasoning. It is priced at $3.97 per million input tokens and $0.02 per million output tokens. Access it through the OpenAI-compatible API with one key, alongside 100+ other models on Api.Airforce.

Get an API key View pricing

Pricing

Input / 1M tokens

$3.97

Output / 1M tokens

$0.02

Cache read / 1M tokens

$0.28

Specifications

Provider: Google
Type: chat model

Capabilities

Reasoning

What is [SP]gemini 3.1 Pro Preview used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
Complex reasoning — math, coding and step-by-step problem solving.

[SP]gemini 3.1 Pro Preview vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
[SP]gemini 3.1 Pro Preview	—	—	$3.97	$0.02
[SP]gemini 2.5 Pro	—	—	$3.97	$0.02
[SP]gemini 3.5 Flash	—	—	$13.27	$0.02
[SP]gemini 3.6 Flash	—	—	$3.97	$0.02

Prices are Api.Airforce pay-as-you-go rates per 1M tokens. Context is the maximum input length.

Related models

[SP]gemini 2.5 ProGoogle · $3.97 / 1M [SP]gemini 3.5 FlashGoogle · $13.27 / 1M [SP]gemini 3.6 FlashGoogle · $3.97 / 1M Gemini 2.0 FlashGoogle · $0.13 / 1M Gemini 2.0 Flash 001Google · $0.13 / 1M Gemini 2.0 Flash LiteGoogle · $0.09 / 1M Gemini 2.0 Flash Lite 001Google · $57.41 / 1M Gemini 2.5 Computer Use Preview 10Google · $57.41 / 1M Gemini 2.5 FlashGoogle · $0.53 / 1M Gemini 2.5 Flash Image PreviewGoogle · $0.07 / 1M Gemini 2.5 Flash Image TokenGoogle · $0.33 / 1M Gemini 2.5 Flash LiteGoogle · $0.08 / 1M

[SP]gemini 3.1 Pro Preview — frequently asked questions

How much does [SP]gemini 3.1 Pro Preview cost?: [SP]gemini 3.1 Pro Preview is billed pay-as-you-go at $3.97 per 1M input tokens and $0.02 per 1M output tokens. There is no subscription — you only pay for what you use.
What can [SP]gemini 3.1 Pro Preview do?: [SP]gemini 3.1 Pro Preview supports Reasoning.
Is [SP]gemini 3.1 Pro Preview free to use?: [SP]gemini 3.1 Pro Preview is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
How do I use [SP]gemini 3.1 Pro Preview via the API?: [SP]gemini 3.1 Pro Preview is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID [SP]gemini-3.1-pro-preview with your Api.Airforce API key.
Who makes [SP]gemini 3.1 Pro Preview?: [SP]gemini 3.1 Pro Preview is Google's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use [SP]gemini 3.1 Pro Preview via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass [SP]gemini-3.1-pro-preview as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "[SP]gemini-3.1-pro-preview",
    "messages": [{ "role": "user", "content": "Hello!" }]
  }'

Python

from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
    model="[SP]gemini-3.1-pro-preview",
    messages=[{"role": "user", "content": "Hello!"}],
)
print(r.choices[0].message.content)

JavaScript

import OpenAI from "openai";
const client = new OpenAI({ baseURL: "https://api.airforce/v1", apiKey: process.env.AIRFORCE_API_KEY });
const r = await client.chat.completions.create({
  model: "[SP]gemini-3.1-pro-preview",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);