Grok 4 Fast vs GPT-5 Mini
Sample workload: short support reply (~512 output tokens). Open the calculator for your own prompt.
| Field | Grok 4 Fast | GPT-5 Mini |
|---|---|---|
| Provider | xAI | OpenAI |
| Accuracy | Approx | Exact |
| Input / 1M | $0.200/1M | $0.250/1M |
| Output / 1M | $0.500/1M | $2.00/1M |
| Sample input tokens | 25 | 16 |
| Sample request cost | $0.000261 | $0.001028 |
| Pages | Model page | Model page |
Try your own prompt
Sample costs above use a fixed support-chat prompt. For your text, open the main calculator with either model preselected.
Grok 4 Fast in calculator · GPT-5 Mini in calculator · Count tokens (Grok 4 Fast) · Count tokens (GPT-5 Mini) · All comparisons
How LLM pricing works · Exact vs Approx · Grok 4 Fast page · GPT-5 Mini page