LLM Margin Blog
AI cost math for founders, not consultants
Practical guides on LLM unit economics, with formulas, charts, and the calculators you need to plug your own numbers in. Built for founders staring at OpenAI invoices.
How to Calculate LLM Cost Per User (Formula, Examples, Benchmarks)
The exact formula for LLM cost per user, worked examples for GPT-4o, Claude Sonnet, and Gemini, and the four numbers most founders get wrong when modeling AI unit economics.
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AI API Budget Planning for Startups: A Practical 12-Month Framework
How early-stage startups should size, allocate, and stress-test their OpenAI, Anthropic, and Gemini budgets — including the three scenarios every founder should model before raising.
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Each guide on the LLM Margin blog ends with the same thing: the calculator you need to put your own numbers into. We don't write generic AI think pieces — we write the spreadsheet you wish your CFO had given you.
Related tools: SaaS Margin Simulator · Cost Per User Calculator · AI Budget Planner