available

Grok 4.2 Fast

xai/grok-4-2-fast

Prices

Input: $2.00 per 1M tokens
low
Input (>128k ctx): $4.00 per 1M tokens
low
Input (cached read, >128k ctx): $0.20 per 1M tokens
low
Input (cached read): $0.20 per 1M tokens
low
Output: $6.00 per 1M tokens
low
Output (>128k ctx): $12.00 per 1M tokens
low

Specifications

Provider: xai
Context window: 2,000,000
Max output tokens: 30,000
Open weights: no
Released: 03/09/2026
Retires: no date announced
First seen by this tracker: 09/14/2026

Price history

Input — per 1M tokens

Recorded changes for Input
From	Amount
09/14/2026	3
09/20/2026	2

Output — per 1M tokens

Recorded changes for Output
From	Amount
09/14/2026	9
09/20/2026	6

No changes recorded

Input (cached read): 0.2 per 1M tokens, unchanged since 09/20/2026
Input (>128k ctx): 4 per 1M tokens, unchanged since 09/20/2026
Output (>128k ctx): 12 per 1M tokens, unchanged since 09/20/2026
Input (cached read, >128k ctx): 0.2 per 1M tokens, unchanged since 09/20/2026

Last updated 10/02/2026, 02:10