xAIPaidOperational
Grok 3 Fast
API model name: grok-3-fast
Grok 3 Fast is xAI's chat model, served on the Api.Airforce unified API. Access it through the OpenAI-compatible API with one key, alongside 65+ other models on Api.Airforce.
Pricing
Specifications
- Provider
- xAI
- Type
- chat model
What is Grok 3 Fast used for?
- Chatbots & assistants — conversational AI, drafting, summarizing and Q&A.
Grok 3 Fast vs. similar models
| Model | Context | Input / 1M | Output / 1M |
|---|---|---|---|
| Grok 3 Fast | — | — | — |
| Grok 2 Vision | — | — | — |
| Grok 3 | — | $0.63 | $3.21 |
| 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.
Related models
Grok 2 VisionxAIGrok 3xAI · $0.63 / 1MGrok 3 DeepsearchxAI · $0.42 / 1MGrok 3 MinixAIGrok 3 Mini FastxAIGrok 3 ReasonerxAI · $0.42 / 1MGrok 4xAI · $0.70 / 1MGrok 4 FastxAI · $0.03 / 1MGrok 4 FreexAI · FreeGrok 4 HeavyxAI · FreeGrok 4 ThinkingxAI · $1.80 / 1MGrok 4.1 ExpertxAI · $1.80 / 1M
Grok 3 Fast — frequently asked questions
- How much does Grok 3 Fast cost?
- Grok 3 Fast is billed per generation rather than per token. See the pricing page for the current rate.
- What can Grok 3 Fast do?
- Grok 3 Fast is xAI's chat model, accessible through the Api.Airforce API.
- Is Grok 3 Fast free to use?
- Grok 3 Fast is a paid, pay-as-you-go model — no subscription, you are only charged for usage.
- How do I use Grok 3 Fast via the API?
- Grok 3 Fast is OpenAI-compatible. Point any OpenAI SDK at https://api.airforce/v1 and pass the model ID grok-3-fast with your Api.Airforce API key.
- Who makes Grok 3 Fast?
- Grok 3 Fast is xAI's chat model, served through the unified Api.Airforce gateway alongside 65+ other models.
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Use Grok 3 Fast via the API
OpenAI-compatible — point any OpenAI SDK at https://api.airforce/v1 and pass grok-3-fast as the model.
cURL
curl https://api.airforce/v1/chat/completions \
-H "Authorization: Bearer $AIRFORCE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "grok-3-fast",
"messages": [{ "role": "user", "content": "Hello!" }]
}'Python
from openai import OpenAI
client = OpenAI(base_url="https://api.airforce/v1", api_key="$AIRFORCE_API_KEY")
r = client.chat.completions.create(
model="grok-3-fast",
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-3-fast",
messages: [{ role: "user", content: "Hello!" }],
});
console.log(r.choices[0].message.content);