Azure Cognitive Services
Grok 4 Fast (Reasoning)
grok
Model ID grok-4-fast-reasoning
Provider Azure Cognitive Services
Family grok
Status -
Knowledge Cutoff 2025-07
Release Date 2025-09-19
Input Modalities text, image
Output Modalities text
Context Window 2000000
Input Limit -
Output Limit 30000
Tool Calling Yes
Reasoning Yes
Structured Output -
Temperature Control Yes
Open Weights No
Input Cost / 1M tokens $0.20
Output Cost / 1M tokens $0.50
Reasoning Cost / 1M tokens -
Cache Read Cost / 1M tokens $0.05
Cache Write Cost / 1M tokens -