Methodology

The estimator is energy-first. It does not count requests and multiply by a guess: it computes energy in watt-hours from per-model token-energy coefficients when the host supplies token counters, and falls back to published flat-rate constants when it does not. Every coefficient the model ships is published here with its epistemic tier, its unit and the source that justifies it.

Estimates are illustrative — a climate contribution that characterises AI electricity use and its associated CO2e, never a measured footprint, an offset, or a neutralisation claim.

In this section

• Scientific constants registry — the human-readable registry: every coefficient with its tier, value, unit, source and locator, plus the corrections log.
• Methodology decision records — the MDR ids and the reasoning behind each shipped figure.
• Methodology changelog — dated methodology releases and what behaviour changed in each.

Machine-readable form

The registry's machine-readable form is constants.json — a revision-pinned static file served next to these pages. It is the canonical truth; the pages in this section are its committed human-readable companion, and the two are checked against each other by the repository's constants gate.