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What it actually costs to train an LLM: GPUs, days and dollars, worked out step by step

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

You've seen the headlines. "Training a big model costs tens of millions of dollars." Okay, but why that number? Where does it come from? I wanted to count it myself, with a formula short enough to fit on a napkin, and then check the answer against something real. Turns out you can get surprisingly…

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  1. 2026-10-20 17:47 · DEV Community — AI
    What it actually costs to train an LLM: GPUs, days and dollars, worked out step by step

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