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Blended $/1M across tracked versions of this line.
Typical 3:1 output-to-input mix, per 1M tokens
Price as of 2026-05-10 · Source: xai_official_pricing
Complex reasoning, analysis, planning and multi-step problem solving where answer quality matters more than raw cost.
Grok 4 Fast is a cost-efficient xAI reasoning model with a very large context window.
grok-4-fast-reasoning is a Reasoning model from xAI (US). HotON.ai tracks it at $0.20 per 1M input tokens and $0.50 per 1M output tokens, with a 2000K-token context window. Its composite efficiency score is 96/100 at an estimated $0.001 per successful task.
grok-4-fast-reasoning is tracked at $0.20 per 1M input tokens and $0.50 per 1M output tokens. A typical 3:1 output-to-input workload blends to roughly $0.42 per 1M tokens. Figures are illustrative demo data.
Complex reasoning, analysis, planning and multi-step problem solving where answer quality matters more than raw cost.
grok-4-fast-reasoning supports up to a 2000K-token context window — large enough for long documents and extended conversations in a single request.
Within the HotON.ai tracked set, grok-4-fast-reasoning is cheaper than 62% of models on input price and ranks #25 of 535 by overall efficiency.
Yes — qwen3-30b-a3b-thinking-2507 is a lower-cost option at $0.40 per 1M output tokens, while still covering similar Reasoning use cases. Compare them side by side on HotON.ai.
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HotON.ai — grok-4-fast-reasoning (xAI): $0.20/1M input, $0.50/1M output, as of 2026-05-10. https://hoton.ai/en/models/x-ai-grok-4-fast-reasoningPricing is real (via the TestKey catalog, updated daily). Quality (Arena Elo) is real where the model is ranked on LMArena. Efficiency is a modeled composite of real price and context.