Grok 4 Fast (Reasoning)
AI model by xAI. Real-time pricing and benchmark data.
Benchmarks
Editorial Analysis
Profile. Grok 4 Fast (Reasoning) is a budget-tier option from xAI at $0.50/M output tokens. Despite the low price, it scores competitively on measurable benchmarks — making it a candidate for high-volume production workloads where unit cost dominates.
Cost model. For a workload of 1M input tokens + 100K output tokens, Grok 4 Fast (Reasoning) costs $0.25 per million input-equivalent requests. Multiply by your monthly request volume to project the bill, and compare against the speed/correctness profile above to decide if the trade-off is worth it for your workload.
Editorial summary generated from public pricing and benchmark data (Artificial Analysis API). All numbers are sourced — see the Artificial Analysis methodology for benchmark definitions. Last refreshed 2026-09-06.
Compare with similar models
| Model | Input | Output | Speed |
|---|---|---|---|
Grok 4 Fast (Reasoning)Current | $0.20 | $0.50 | — |
| GLM-5.3-Flash | $0.15 | $0.50 | 47 tok/s |
| Phi-4 | $0.13 | $0.50 | 37 tok/s |
| Qwen2.5 Instruct 72B | $0.47 | $0.49 | — |
| Qwen3.8-Flash-Next | $0.15 | $0.47 | 85 tok/s |
| Hy3 | $0.14 | $0.55 | 94 tok/s |