Stop guessing your AI bill. CostPerPrompt tracks live prices for 292 AI models (GPT, Claude, Gemini, Kimi, DeepSeek…) and turns them into real answers: what your chatbot, RAG pipeline, agent, or voice AI costs per month — with prompt caching and batch discounts modeled in. Plus GPU rental comparison across 10 providers, 9 practical cost guides, and a private in-browser token counter. Free, no signup, prices refresh daily.