PromptDiff
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Compare LLMs across models. One API call.
Artificial Intelligence
Developer Tools
API
Stop copy-pasting prompts across ChatGPT, Claude, and Gemini. PromptDiff compares LLM outputs in one API call. Send a prompt + pick models. Get back: output, latency (ms), tokens, and cost (USD) per model. 8 models, 4 providers: - Claude Sonnet & Haiku - GPT-4o & 4o-mini - Gemini Pro & Flash - Grok 3 & 3 Mini No SDK needed. Works with curl, Python, TypeScript. Free: 100 evals/month, no card. Built by a solo dev from Tokyo.
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