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Models / xAI / Grok 4.1 Fast (Reasoning)

xAI · grok

Grok 4.1 Fast (Reasoning)

xAI's fast agentic tool-calling model with a 2M context window and built-in reasoning

$0.20 in · $0.50 out

per 1M tokens · provider rate closest to the median. No first-party xAI price was listed. The reference price is Vertex's rate, the provider closest to the median.

Context
2,000,000
Max output
30,000
Cache read
$0.05
Cache write
—
Reasoning
Yes
Tool calls
Yes
Structured output
Yes
Vision
Yes
Open weights
No
License
—
Released
Nov 19, 2025
Updated in source
Nov 19, 2025
Knowledge
—
Providers
2

What this model costs per month

Prices are USD per 1M tokens. A month is 30 days. Cache hits use the cache-read rate when the model has one; otherwise the cache field is ignored.

monthly = requests/day × 30 × (input tokens × (1 − cache hit) × input price + input tokens × cache hit × cache-read price + output tokens × output price) ÷ 1,000,000

Providers

Base rates from Models.dev. One row per provider.
ProviderInputOutputCache readCache writeStatus
Vercel AI Gateway$0.20$0.50$0.05——
Vertexreference$0.20$0.50$0.05—deprecated