I Built a Free AI Model Waste Auditor — No Signup Required

TL;DR: I built No 13th Floor — a free tool that audits your AI model usage and tells you exactly how much compute and money you're wasting by running oversized models. No account needed. No credit card. Try it in 30 seconds. The Problem Every engineering team I've talked to has the same story: they reached for GPT-4 (or a 70B open-source model) to handle tasks that a 7B model could do just fine. The logic made sense at the time — "why risk it?" — but the bill didn't. A classification task that needs 3B parameters gets a 70B model. A summarization job that runs perfectly on Mistral 7B gets routed through a GPT-4-class API at 30x the cost. The waste is invisible until it shows up as a cloud bill line item that everyone shrugs at. This isn't hypothetical. These conversations happen on Reddit, in Slack, in post-mortems: "We were using GPT-4 for everything... yeah, I know" — r/OpenAI "AI support costs way higher than expected... wrong model for the task" — r/SaaS "It felt like overkill to u