ZenMuxGrok 4.1 Fast model ID, context window & pricing
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Quick facts
Model ID x-ai/grok-4.1-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 4.1 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-4.1-fast
Provider ZenMux
Family -
Status -
Knowledge Cutoff 2025-01-01
Release Date 2025-11-20
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 -