x-ai/grok-3-fast
Model Card
Grok 3 Fast is a latency-optimized variant of Grok 3 using the same underlying model but served on faster infrastructure. It delivers quicker response times for latency-sensitive applications while maintaining equivalent reasoning quality and 131K context window.
Context Window
131K
tokens
Max Output
131,072
tokens
Input Cost
$5
per million tokens
Output Cost
$25
per million tokens
API Usage Example
Add Grok 3 Fast to your app with just a few lines of code.
No API keys, no backend, no configuration required.
<html>
<body>
<script src="https://js.puter.com/v2/"></script>
<script>
puter.ai.chat("Explain quantum computing in simple terms", {
model: "x-ai/grok-3-fast"
}).then(response => {
document.body.innerHTML = response.message.content;
});
</script>
</body>
</html>
Get started with Puter.js
Add Grok 3 Fast to your app without worrying about API keys or setup.
Read the Docs View Tutorials