X-Ai/Grok-4-Fast-Non-Reasoning
X-Ai/Grok-4-Fast-Non-Reasoning is developed by xAI, released 2025-12-18.
Also written as: X Ai/Grok 4 Fast Non Reasoning
Model ID: grok-4-fast-non-reasoning
Input price
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Output price
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Blended price
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Epoch Capabilities Index (ECI)
No public data yet
Epoch Mock AIME accuracy
No public data yet
Epoch FrontierMath (T1–3) accuracy
No public data yet
Arena text rating
1418.5
49th percentile of 164 models with an Arena text rating score
LMArena · as of 2026-11-06
Arena coding rating (human preference votes, not task accuracy)
1456.2
LMArena · as of 2026-11-06
Arena math rating
1424.1
LMArena · as of 2026-11-06
Arena WebDev rating
No public data yet
No API price is published for this model in our data sources (models.dev,
LiteLLM), so we show — rather than guess. It may be unreleased via API, open-weights
only, or simply not tracked yet.
See all of xAI's models on its provider page, or browse the full model directory. Full source licenses and sync dates: /data-sources/.