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Grok 4.2 Fast

xAI · grok-4-2-fast

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Reasoning Grok for document-heavy analysis and long-horizon tool use

Specification

most-agreed values

Context
2M
Max output
30K
Released
2026-03-09
Knowledge cutoff
—
Retires
—
Open weights
no
Input
text, image
Output
text

Price

US dollars per million tokens · most-agreed

Input
$2.00
Output
$6.00
Cache read
$0.20

Available from 1 host

HostIn $/MOut $/MCache rdCache wrContextOutputRetires
zenmux · x-ai$2.00$6.00$0.20—2M30K—

Price history

append-only observations · a listing writes a row only when its price moves

DateHostField$/M
2026-09-02zenmux · x-aiInput$3.00
2026-09-20zenmux · x-aiInput$2.00
2026-09-02zenmux · x-aiOutput$9.00
2026-09-20zenmux · x-aiOutput$6.00

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