Where the numbers come from

Sources

• API prices: OpenRouter models API, fetched 2026-11-11. The dollar-per-token field is multiplied by one million.
• Pounds: 0.74501 US dollars to the pound on 2026-11-10, European Central Bank reference rate via Frankfurter. Not a bank’s sell rate.
• Electricity default: 26.32p per kWh. Ofgem price cap, average electricity unit rate for a Direct Debit customer in England, Scotland and Wales on a single-rate default tariff. No VAT on electricity in this period, per Ofgem. The daily standing charge is not included. Your region and payment method can differ. Ofgem, 1 October 2026 to 31 December 2026.
• GPU memory and power: the NVIDIA product page linked on each GPU page, read 11 November 2026. UK shop prices are not filled in. The RTX 5090 page states an MSRP of £1,799; that is not used as a purchase price.
• Tokens per second: four runs that llm-speed marked as measured by the site, not community submissions. None of those rows included a watt measurement, so electricity uses official graphics power and is labelled an estimate.
• Job presets (a small team chatbot, 1,000 summaries, a coding month) are worked examples. They are not measurements of your usage.

If a figure could not be sourced, it is left out. That includes most local speeds, and every high-street GPU price.