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Models / xAI / X-Ai/Grok-4-Fast-Reasoning

xAI

X-Ai/Grok-4-Fast-Reasoning

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

— in · — out

per 1M tokens · no published price. Models.dev does not list a per-token price for this model yet.

Context
2,000,000
Max output
2,000,000
Cache read
—
Cache write
—
Reasoning
Yes
Tool calls
Yes
Structured output
No
Vision
Yes
Open weights
No
License
—
Released
Dec 18, 2025
Updated in source
Dec 18, 2025
Knowledge
—
Providers
0

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

Models.dev has a canonical record for this model and no provider listing.