PromptDiff

PromptDiff streamlines the evaluation of textual responses from various large language models (LLMs) with a single API call. Key capabilities include: * Simultaneous comparison of multiple model outputs * Performance metrics: latency, token usage, and cost per model * Support for leading providers: Claude, GPT, Gemini, and Grok * Direct API integration with `curl`, Python, and TypeScript * No SDK required for ease of implementation This tool eliminates the need for manual copy-ppasting and simplifies the process of assessing different model behaviors. Users can send a single prompt and receive a structured JSON response detailing each model's output alongside crucial operational metrics. This side-by-side comparison empowers developers and researchers to quickly understand the nuances and efficiency of various textual generation models. PromptDiff is ideal for developers building applications that rely on external language models, researchers conducting comparative studies, and product managers making informed decisions about model selection. It supports a range of models including Claude Sonnet & Haiku, GPT-4o & 4o-mini, Gemini Pro & Flash, and Grok 3 & 3 Mini, with more models continuously added. A free tier offering 100 evaluations per month allows for easy experimentation without a credit card.