Capabilities
7-day heat trend
+4.5%Pricing breakdown
Typical 3:1 output-to-input mix, per 1M tokens
Estimated monthly cost by workload
Market position
- Cheaper than 43% of tracked models
- Faster than 76% of tracked models
- Efficiency rank: #16 of 1105
Best suited for
Complex reasoning, analysis, planning and multi-step problem solving where answer quality matters more than raw cost.
About xai/grok-4-fast-reasoning
Vercel AI Gateway route for Grok 4 Fast Reasoning, preserving upstream reasoning metadata for supplier prefill.
xai/grok-4-fast-reasoning is a Reasoning model from Vercel AI Gateway (US). HotON.ai tracks it at $0.00 per 1M input tokens and $0.00 per 1M output tokens, with a 2000K-token context window, ~162 tokens/sec throughput and 99.5% availability. Its composite efficiency score is 96/100 at an estimated $0.000 per successful task.
Compare xai/grok-4-fast-reasoning
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Frequently asked questions
How much does xai/grok-4-fast-reasoning cost per 1M tokens?+
xai/grok-4-fast-reasoning is tracked at $0.00 per 1M input tokens and $0.00 per 1M output tokens. A typical 3:1 output-to-input workload blends to roughly $0.00 per 1M tokens. Figures are illustrative demo data.
What is xai/grok-4-fast-reasoning best for?+
Complex reasoning, analysis, planning and multi-step problem solving where answer quality matters more than raw cost.
How fast is xai/grok-4-fast-reasoning?+
xai/grok-4-fast-reasoning delivers about 162 tokens/sec with 99.5% tracked availability, suitable for latency-sensitive, real-time applications.
Is xai/grok-4-fast-reasoning cheaper than other AI models?+
Within the HotON.ai tracked set, xai/grok-4-fast-reasoning is cheaper than 43% of models on input price and ranks #16 of 1105 by overall efficiency.
Related models
Pricing is real (via the TestKey catalog, updated daily). Quality (Arena Elo) is real where the model is ranked on LMArena. Speed, availability and efficiency are modeled estimates.