AzureGrok 4 Fast (Reasoning) model ID, context window & pricing
grok
Quick facts
Model ID grok-4-fast-reasoning
Source Azure
Context Window 2000000
Pricing $0.20 input / $0.50 output per 1M tokens
Capabilities tool calling, reasoning, temperature control
Model overview
Grok 4 Fast (Reasoning) is an AI model from Azure with 2000000 token context window and text, image input support.
Published pricing is $0.20 input and $0.50 output per 1M tokens.
- Workloads that use text, image inputs with text outputs.
- Agent and tool workflows that need function calling.
- Reasoning-heavy prompts where stepwise problem solving matters.
Model ID grok-4-fast-reasoning
Provider Azure
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 -