Grok 4 Fast · context window2M token

validasserted

Valid from: 2025-09-19
Valid until: still holds
Published: 2025-09-19
Recorded by AsOf: 2026-11-04
Checked: 2026-11-04 · its source page states the value and the date
Confidence: 0.95

Sources

“We're rolling out Grok 4 Fast as two models: grok-4-fast-reasoning and grok-4-fast-non-reasoning , each with a 2M token context window.”— what the page says, read 2026-11-04

Grok 4 Fastprimary · x.ai · 2025-09-19

/claim/clm_B23CF82119F1.md /v1/claims/clm_B23CF82119F1 timeline submit a correction