Grok 4.1 Fast (Reasoning)

xAI ▪ grok-4.1-fast-reasoning

Chat with Grok 4.1 Fast (Reasoning)

Input Pricing$0.20/M tokens

Output Pricing$0.50/M tokens

Capabilities

Context Window

2,000,000 tokens

Max Output

Not specified tokens

Knowledge Cutoff

Not specified

Modalities

Input: text, image

Output: text

Latency

2.5 s

Median time to first token over the last 30 days (400 samples).

Pricing Details

Grok 4.1 Fast (Reasoning) token pricing (USD per 1M tokens)
Token type	Price (USD / 1M tokens)
Input tokens	$0.20
Output tokens	$0.50

Model Information

Provider: xAI
Model Slug: grok-4.1-fast-reasoning
Reasoning: Yes

Compare to other xAI models

Grok 2
$2.00 / $10.00 per M tokens
Grok 3
$3.00 / $15.00 per M tokens
Grok 3 Mini
$0.25 / $0.50 per M tokens
Grok 3 Mini (Fast)
$0.60 / $4.00 per M tokens
Grok 4
$3.00 / $15.00 per M tokens
Grok 4.1 Fast
$0.20 / $0.50 per M tokens

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