How much does Grok 4 Heavy cost?

Grok 4 Heavy is available on the free tier at no token cost — create an API key and start building. Paid plans add higher rate limits.

What can Grok 4 Heavy do?

Grok 4 Heavy is xAI's chat model, accessible through the Api.Airforce API.

Is Grok 4 Heavy free to use?

Yes — Grok 4 Heavy is on the free tier. You can use it with an Api.Airforce API key at no cost.

How do I use Grok 4 Heavy via the API?

Grok 4 Heavy is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID grok-4-heavy with your Api.Airforce API key.

Who makes Grok 4 Heavy?

Grok 4 Heavy is xAI's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

xAIFreeOperational

Grok 4 Heavy

API model name: grok-4-heavy

Grok 4 Heavy is xAI's chat model, served on the Api.Airforce unified API. It is available on the free tier at no per-token cost. 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

Free

Output / 1M tokens

Free

Specifications

Provider: xAI
Type: chat model

What is Grok 4 Heavy used for?

Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.

Grok 4 Heavy vs. similar models

Model	Intelligence	Context	Input / 1M	Output / 1M
Grok 4 Heavy	—	—	Free	Free
Grok 2 Vision	—	—	$3.12	$15.57
Grok 3	—	—	$0.45	$2.25
Grok 3 Deepsearch	—	—	$0.42	$2.13

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

Grok 4 Heavy — frequently asked questions

How much does Grok 4 Heavy cost?: Grok 4 Heavy is available on the free tier at no token cost — create an API key and start building. Paid plans add higher rate limits.
What can Grok 4 Heavy do?: Grok 4 Heavy is xAI's chat model, accessible through the Api.Airforce API.
Is Grok 4 Heavy free to use?: Yes — Grok 4 Heavy is on the free tier. You can use it with an Api.Airforce API key at no cost.
How do I use Grok 4 Heavy via the API?: Grok 4 Heavy is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID grok-4-heavy with your Api.Airforce API key.
Who makes Grok 4 Heavy?: Grok 4 Heavy is xAI's chat model, served through the unified Api.Airforce gateway alongside 100+ other models.

All models·Quickstart·Chat API reference

Use Grok 4 Heavy via the API

OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass grok-4-heavy as the model.

cURL

curl https://api.airforce/v1/chat/completions \
  -H "Authorization: Bearer $AIRFORCE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-4-heavy",
    "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="grok-4-heavy",
    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: "grok-4-heavy",
  messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);