Grok 4 Fast
xAIOverview
Grok 4 Fast is a high-speed variant of Grok-4, optimized for faster inference while maintaining strong reasoning capabilities. It offers improved throughput and lower latency compared to the standard Grok-4 model.
Grok 4 Fast was released on August 28, 2025. API access is available through xAI.
Performance
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Benchmarks
Grok 4 Fast Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Sat Dec 06 2025Pricing
Pricing, performance, and capabilities for Grok 4 Fast across different providers:
| Provider | Input ($/M) | Output ($/M) | Max Input | Max Output | Latency (s) | Throughput | Quantization | Input | Output |
|---|---|---|---|---|---|---|---|---|---|
xAI | $0.20 | $0.50 | 2.0M | 30.0K | — | 90 tok/s | — | Text Image Audio Video | Text Image Audio Video |
Example Outputs
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API Access
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FAQ
Common questions about Grok 4 Fast