AI Model Catalog: 2 Models Compared — Pricing, Context & Benchmarks

xAI: X-Ai/Grok-4-Fast-Reasoning T

Reasoning Tools

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

xai/grok-4-fast-reasoning 2025-12-18 2M context $0.2/M input $0.5/M output

2 providers

xAI: X-Ai/Grok-4-Fast-Non-Reasoning T

Tools

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

xai/grok-4-fast-non-reasoning 2025-12-18 2M context $0.2/M input $0.5/M output

3 providers

Filterable model directory
Model	Creator	Inputs	Context	Input	Output	Released	Compare
X-Ai/Grok-4-Fast-Reasoningxai/grok-4-fast-reasoning	xAI	T	2M	$0.2	$0.5	2025-12-18
X-Ai/Grok-4-Fast-Non-Reasoningxai/grok-4-fast-non-reasoning	xAI	T	2M	$0.2	$0.5	2025-12-18