§.FAQ
How much does a single call cost?
Typical cost ranges for the most common models and an example calculation.
Updated 2026-04-13 · By Jon Lasley
Cost is determined by tokens in × input rate + tokens out × output rate. Here's a rough guide for a medium-length prompt call (say, 2,000 tokens in, 500 tokens out):
| Model | Rough cost per call |
|---|---|
| Claude Opus 4.7 | $0.0225 |
| Claude Opus 4.6 | $0.0225 |
| Claude Sonnet 4.6 | $0.0135 |
| Claude Haiku 4.5 | $0.0045 |
| GPT-4.1 | $0.008 |
| GPT-4.1 Mini | $0.0016 |
| GPT-4.1 Nano | $0.0004 |
| Gemini 2.5 Pro | $0.0075 |
| Gemini 2.5 Flash | $0.00185 |
Prompt Assay doesn't take a cut
Every call bills your provider account directly. We don't mark up tokens and we don't meter your usage for billing. The usage dashboard shows the cost at your provider's published rate.