X-aiClosed Weights

x-AI/Grok-4-Fast

x-ai/grok-4-fast

Best Input Price

$0.00 / 1M

Fast Grok model for responsive chat, reasoning, and tool-assisted work

Context Window

2,000,000 tokens

Reasoning

Supported

Tool Calling

Supported

Released

2025-09-20

Inference Providers (1)

Provider	Model ID	Context	Input / 1M	Output / 1M	Action
Qiniu	x-ai/grok-4-fast	2,000,000	$0.00	$0.00	Docs ↗