Grok-4 Fast Reasoning
Overview
Overview
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
Timeline
ReleasedUnknown
Knowledge CutoffUnknown
Specifications
Parameters
Unknown
License
Proprietary
Training Data
Unknown
Tags
thinking:true
Benchmarks
Benchmarks
No data available
Notice missing or incorrect data?Start an Issue discussion→
Pricing
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 c/s | — | Text Image Audio Video | Text Image Audio Video |
API Access
API Access Coming Soon
API access for Grok-4 Fast Reasoning will be available soon through our gateway.
Recent Posts
Recent Reviews
FAQ
Common questions about Grok-4 Fast Reasoning
Grok-4 Fast Reasoning was released on August 28, 2025 by xAI.
Grok-4 Fast Reasoning was created by xAI.
Grok-4 Fast Reasoning is released under the Proprietary license.
Yes, Grok-4 Fast Reasoning is a multimodal model that can process both text and images as input.