Grok 4 Fast (Reasoning)
Release Date: 9/19/2025
Benchmarked by 
Latest advancement in cost-efficient reasoning models with unified architecture. Handles complex requests with deep chain-of-thought reasoning. Features 2M token context window and native tool use.
Avg. Accuracy
57.93%
Latency
197.22s
Cost (In/Out)
0.2 / 0.5
Context Window
2M
Max Output Tokens
2M
Input Modality
Hyperparameter settings
Default Provider :
xAI
Some benchmarks may use different provider and parameters. Please refer to the benchmark page for more information.
Temperature
0.7
Top P
0.95
Top K
Default
Max Output Tokens
2,000,000
Benchmarks
Accuracy
Rankings
Academic Benchmarks
Proprietary Benchmarks (contact us to get access)