Grok 4 Fast
ModelEfficiency-focused Grok 4 variant with unified reasoning and non-reasoning modes and a 2M-token context window.
- Sep 19, 2025
- 2M†
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Releases
Sep 19, 2025Grok 4 Fast releasedModel release
xAI released Grok 4 Fast with a 2M-token context window, unified reasoning modes and lower-cost agentic search.
† Illustrative seed value, not verified or live market data.