xAIActive
grok-4-fast-reasoning
Fast Grok model for responsive chat, reasoning, and tool-assisted work
Context
2,000,000
Max output
2,000,000
Input / 1M
$0.18
Output / 1M
$0.45
Providers
5
01Profile
Profile
Released
2025-09-23
Last updated
2026-01
Knowledge cutoff
2025-06
Weights
Closed
02Capabilities
Capabilities
Input
text · image
Output
text
Reasoning
Yes
Tool calling
Yes
Structured output
No
Attachments
Yes
Cache read
—
Cache write
—
03Pricing
Pricing across 4 providers
Per 1M tokens, USD. Sorted by input price. First-party row highlighted.
04History
Change history
12+ recent events since 2025-09-23
2026-07-25Removedazureofferingremoved→ new
2026-06-24Removedllmgatewayofferingremoved→ new
2026-06-08Removedvercelofferingremoved→ new
2026-03-23Price cutllmgatewayinput / 1M$0.40→ $0.20
2026-03-23Price cutllmgatewayoutput / 1M$1.00→ $0.50
2026-03-23ContextllmgatewayMax output16,384→ 30,000
2026-02-09Removedfirmwareofferingremoved→ new
2026-01-30Addedjiekouoffering→ new
2026-01-23ContextllmgatewayMax output—→ 16,384
2026-01-23Addedllmgatewayoffering→ new
2026-01-16Addedqiniu-aioffering→ new
2026-01-15Context302aiMax output—→ 30,000