PromptBench

About

Instead of wondering about prompt effectiveness, use PromptBench. It allows simultaneous prompt execution across models like Claude, GPT-5, o3, and Mistral. Evaluate results using a 1 to 10 scale and monitor how well prompts perform using performance analytics over time. Key features include a multi-model playground, prompt version control, scoring capabilities, an analytics dashboard, and chat and complete modes. Currently, ten models are supported. It's free if you supply your own API keys or $12 per month for the Pro version with managed credits.