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Grok 4.1 Fast Reasoning vs Opus 4.5
Compare these two AI models side by side on Zo Computer
Key Differences
- •Grok 4.1 Fast Reasoning has a larger context window (2M vs 200k tokens)
- •Opus 4.5 has more recent training data (Mar 2025 vs Nov 2024)
- •Grok 4.1 Fast Reasoning is more affordable for input ($0.20 vs $5.00/1M tokens)
- •Grok 4.1 Fast Reasoning is more affordable for output ($0.50 vs $25.00/1M tokens)
- •Opus 4.5 is newer (released Nov 2025)
2M tokens
Context
200k tokens
Nov 2024
Knowledge
Mar 2025
Nov 2025
Released
Nov 2025
$0.20/1M
Input
$5.00/1M
$0.50/1M
Output
$25.00/1M
Both Grok 4.1 Fast Reasoning and Opus 4.5 are available on Zo Computer. Try them both to see which one works best for your use case.