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
63.5%
Latency
121.7s
Cost (In/Out)
0.20 / 0.50
Context Window
2M
Max Output Tokens
2M
Input Modality
Benchmarks
Accuracy
Rankings
Academic Benchmarks
Proprietary Benchmarks (contact us to get access)