Grok 4 Fast

xAI model details for pricing, context, and release tracking.

Pricing data updated:  Prices normalized to USD per 1M tokens Sample workload: 1M input + 500K output
Model Specs
ProviderxAI
Model IDx-ai/grok-4-fast
Prompt Price
per 1M tokens		$0.2
Completion Price
per 1M tokens		$0.5
Sample Workload Cost
1M input + 500K output		$0.45
Context Window2M
Release Date2025-09-19
Popularity RankUnranked
Daily DemandN/A

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Prices are normalized to USD per 1M tokens.
Grok 4 Fast Calculating… Estimated monthly API cost
Unit prices $0.2 input / $0.5 output Per 1M tokens

This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.

Model Introduction

Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...

Best Fit

Grok 4 Fast is best suited for long-context workloads.

Cost Example

A 1M input token plus 500K output token workload is estimated at $0.45.

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