Grok-4.1 Fast Reasoning: Benchmarks, Pricing & Context Window
Grok-4.1 Fast Reasoning is a language model from xAI, released in November 2025, with multimodal input.
Bringing the next generation of tool-calling agents to the xAI API. Grok-4.1 Fast Reasoning is a high-speed variant optimized for faster inference while maintaining strong reasoning capabilities through thinking tokens.
Grok-4.1 Fast Reasoning pricing
Providers
Grok-4.1 Fast Reasoning starts at $0.200 per million input tokens and $0.500 per million output tokens via xAI.
| Provider | Input $/M | Output $/M | Max Input | Max Output | Latency s | Throughput | Quant | Input | Output |
|---|---|---|---|---|---|---|---|---|---|
 xAI | $0.200 | $0.500 | 2.0M | 30.0K | 3.91 | 82 c/s | — |
Grok-4.1 Fast Reasoning API
API access coming soon
Grok-4.1 Fast Reasoning will be available through our gateway shortly.
Grok-4.1 Fast Reasoning examples
Recent arena outputs from Grok-4.1 Fast Reasoning, picked from the highest-ranked matchups.
Grok-4.1 Fast Reasoning license
Grok-4.1 Fast Reasoning is released under the Proprietary license, which restricts commercial use.
- License
- Proprietary
- Non-commercial
Proprietary license - usage restrictions apply
FAQ
Common questions about Grok-4.1 Fast Reasoning.