LLM Comparison

Grok 4 Fast vs Grok 4.1 Fast

Side-by-side specs, pricing & capabilities · Updated April 2026

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2/6 models

Same tier:

	Grok 4 Fast	Grok 4.1 Fast
Organization	xAI	xAI
OpenTools Score
Family	Grok	Grok
Status	Current	Current
Release Date	Sep 2025	Nov 2025
Context Window	2.0M tokens	2.0M tokens
Input Price	$0.20/M tokens	$0.20/M tokens
Output Price	$0.50/M tokens	$0.50/M tokens
Pricing Notes	Cache read: $0.0500/M tokens	Cache read: $0.0500/M tokens
Capabilities	textvisioncode	textvisioncode
Max Output	30K tokens	30K tokens
API Identifier	`x-ai/grok-4-fast`	`x-ai/grok-4.1-fast`
	View Grok 4 Fast	View Grok 4.1 Fast

Cost Calculator

Enter your expected monthly token usage to compare costs.

Input tokens / month

Output tokens / month

Model	Input	Output	Total / mo	vs Best
Grok 4 FastCheapest	$0.20	$0.25	$0.45	—
Grok 4.1 FastCheapest	$0.20	$0.25	$0.45	—

xAI

Grok 4 Fast

Grok 4 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.

xAI

Grok 4.1 Fast

Grok 4.1 Fast is a multimodal llm from xAI. Supports up to 2,000,000 token context window. Available from $0.20/M input tokens.

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