google: 0.24 wh / prompt. disclosed, methodology published.
openai: 0.34 wh. disclosed, no methodology.
anthropic: no disclosure. 0.31 wh independent estimate.
reasoning workloads: ~13× energy.
carbon price: $300 per tonne. frontier buyers' 90,000-tonne terradot purchase, $27m, dec 2024. terraset buys from the frontier portfolio.
water: lifecycle estimate, ~112 ml per wh, the ratio in mistral's lca (45 ml per response, jul 2025), the only full lifecycle water disclosure. onsite-only figures are ~100× smaller.
water price: $2 per 1,000 gallons. bef's published wrc rate.
human tax: +50% on the resource cost, one equal third of the total. an equal share for the people whose work fed the machines.
minimum: $5. below that it's a rounding error, not a penance.
boundaries differ between every disclosure. this page inherits those sins and tells you so.