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xAI
Grok 4 Fast
Fast
Pricing
Input / 1M tokens$0.200
Output / 1M tokens$0.500
Specs
Context window2M
Max output32K
Speed tier
Knowledge cutoff—
Free tierNo
Hosted byFirst-party
API ID
grok-4-fastCapabilities
Verified2026-04-21
Source xAI pricing
Cheapest fast 2M
Price history
No changes recorded yet. We start tracking from the moment a model lands in the catalog.