Quick answer: The PromptEval Prompt Quality Report scored over 1,000 real prompts across 12 use cases. The average was 52 out of 100, and only 8% reached "good" (75+). The strongest single predictor of a good prompt is whether it defines its output format, worth 27 points on average. In 9 of 10 prompts, the weakest dimension was robustness.
This is the PromptEval Prompt Quality Report. Over 1,000 real prompts have been scored on PromptEval, submitted by real users across use cases from customer support to healthcare to code. Each was scored from 0 to 100 on four structural dimensions: clarity, specificity, structure, and robustness. Every figure below comes from that set. No prompt text is stored; the analysis is anonymous and aggregate.
Only 8% of the 1,000+ scored prompts reached "good" (75 or higher). Fewer than 1% reached "excellent."
Source: PromptEval Prompt Quality Report, 2026
How the scores break down
