Grok-4 Fast Reasoning
xAIOverview
Pushing the Frontier of Cost-Efficient Intelligence. Grok-4 Fast Reasoning is a high-speed variant of Grok-4 optimized for faster inference while maintaining strong reasoning capabilities through thinking tokens.
Grok-4 Fast Reasoning was released on August 28, 2025. API access is available through xAI.
Performance
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Pricing
Pricing, performance, and capabilities for Grok-4 Fast Reasoning 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 |
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API Access
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API access for Grok-4 Fast Reasoning will be available soon through our gateway.
FAQ
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