Arena Elo 1150Human-preference rating · LMArena (shown where the model is ranked)
Capabilities
7-day heat trend
−6.0%Pricing breakdown
Typical 3:1 output-to-input mix, per 1M tokens
Estimated monthly cost by workload
Market position
- Cheaper than 28% of tracked models
- Faster than 22% of tracked models
- Efficiency rank: #8 of 1105
Best suited for
Mixed text, image, audio and document workloads that benefit from one model across modalities.
About grok-4-fast
Grok 4 Fast is xAI's latest multimodal model with SOTA cost-efficiency and a 2M token context window. It comes in two flavors: non-reasoning and reasoning. Read more about the model...
grok-4-fast is a Multimodal 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, ~132 tokens/sec throughput and 99.3% availability. Its composite efficiency score is 96/100 at an estimated $0.001 per successful task.
Compare grok-4-fast
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Frequently asked questions
How much does grok-4-fast cost per 1M tokens?+
grok-4-fast 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.
What is grok-4-fast best for?+
Mixed text, image, audio and document workloads that benefit from one model across modalities.
How fast is grok-4-fast?+
grok-4-fast delivers about 132 tokens/sec with 99.3% tracked availability, suitable for latency-sensitive, real-time applications.
Is grok-4-fast cheaper than other AI models?+
Within the HotON.ai tracked set, grok-4-fast is cheaper than 28% of models on input price and ranks #8 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.