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AI models

xai

Grok 4 Fast

AI model Released Sep 19, 2025

Open weights: No^*

Capability & preference

General capability · ECI

A cross-benchmark capability estimate. Index points, not a percentage; intervals show uncertainty.

Grok 4 Fast 144.2^* Grok 4 Fast · 95% interval 141.7–146.5

Run it locally

Inference · memory estimate

Grok 4 Fast

Closed weights. No supported local deployment or GPU requirement is published.

Capabilities

Open weights: No^*

System configuration

Detailed specifications

Specifications · 4 fields

Access model: API access^*
Open weights: No^*
Organization: xAI^*
Organization country: United States of America^*

* Provisional data