Which is cheaper, Grok 4.1 Fast Reasoning or Grok 4.20 Reasoning?
Grok 4.1 Fast Reasoning costs $0.2/M input; Grok 4.20 Reasoning costs $1.25/M input. Price spread matters at billion-token scale.
Gateway catalog snapshot.
Grok 4.1 Fast Reasoning is cheaper at $0.2/M input vs $1.25/M input for Grok 4.20 Reasoning. Compare context, hosts, and o10 routing bands.
Last updated: 2026-06-27. Full catalog. Reference prices are dated snapshots. Compare total cost and measured task quality before choosing a route.
Grok 4.1 Fast Reasoning vs Grok 4.20 Reasoning. Price, context, routing
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AnswersSelf-contained
How do Grok 4.1 Fast Reasoning and Grok 4.20 Reasoning context windows compare?
Grok 4.1 Fast Reasoning: 1,000,000 tokens. Grok 4.20 Reasoning: 2,000,000 tokens.
01Deep dive
Comparison summary
Grok 4.1 Fast Reasoning is cheaper at $0.2/M input vs $1.25/M input for Grok 4.20 Reasoning. Compare context, hosts, and o10 routing bands.
Grok 4.1 Fast Reasoning is cheaper at $0.2/M input vs $1.25/M input for Grok 4.20 Reasoning. Compare context, hosts, and o10 routing bands.
SourceMethodology
o10 gateway + fulfillment catalog snapshot.
FAQFrequently asked questions
Common questions
Which is cheaper, Grok 4.1 Fast Reasoning or Grok 4.20 Reasoning?
Grok 4.1 Fast Reasoning at $0.2/M input vs $1.25/M for Grok 4.20 Reasoning.
Can you run both on the same hosts?
Grok 4.1 Fast Reasoning: xAI. Grok 4.20 Reasoning: xAI.