ZenMuxGrok 4 Fast model ID, context window & pricing
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Quick facts
Model ID x-ai/grok-4-fast
Source ZenMux
Context Window 2000000
Pricing $0.20 input / $0.50 output per 1M tokens
Capabilities tool calling, reasoning, temperature control
Model overview
Grok 4 Fast is an AI model from ZenMux 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 x-ai/grok-4-fast
Provider ZenMux
Family -
Status -
Knowledge Cutoff 2025-01-01
Release Date 2025-09-19
Input Modalities text, image
Output Modalities text
Context Window 2000000
Input Limit -
Output Limit 64000
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 -