# xAI — Grok 4 Fast

- Company: xAI (x.ai)
- Announced: 2025-09-19T00:00:00+00:00
- Category: new-model
- Subject: Grok
- Models affected: Grok 4 Fast
- Source: https://x.ai/news/grok-4-fast
- Record: https://forck.live/items/3485-grok-4-fast

xAI announced Grok 4 Fast, a model pushing the frontier of cost-efficient intelligence.

## Evidence

Verbatim from https://x.ai/news/grok-4-fast:

> Grok 4 Fast Pushing the Frontier of Cost-Efficient Intelligence Sep 19, 2025

---

Record: https://forck.live/items/3485-grok-4-fast
Catalogue: https://forck.live/llms.txt
Feed: https://forck.live/feed.md