Key Differences
- •Grok 4.1 Fast Reasoning has a larger context window (2M vs 203k tokens)
- •Grok 4.1 Fast Reasoning has more recent training data (Nov 2024 vs Jan 2024)
- •Grok 4.1 Fast Reasoning is more affordable for input ($0.20 vs $0.45/1M tokens)
- •Grok 4.1 Fast Reasoning is more affordable for output ($0.50 vs $1.90/1M tokens)
- •Grok 4.1 Fast Reasoning is newer (released Nov 2025)
203k tokens
Context
2M tokens
Jan 2024
Knowledge
Nov 2024
Oct 2025
Released
Nov 2025
$0.45/1M
Input
$0.20/1M
$1.90/1M
Output
$0.50/1M
Both GLM 4.6 and Grok 4.1 Fast Reasoning are available on Zo Computer. Try them both to see which one works best for your use case.