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Using an industry-standard weighted average, OpenAI’s smallest, fastest model, GPT-5 Nano, costs around 10 cents per million tokens, while the full-fledged, more sophisticated GPT-5 costs around $3.44 per million tokens.

Prices start at $550 for the first passenger, and $100 for each additional flier per trip.

It is offered at 22 U.S. and international airports, including New York, Los Angeles, London and Tokyo, for $350 for the first person, $100 per additional adult and $50 per child.

Prices start at around $1,200-plus per person.

The Sovereign Grant was £31m per year when it was introduced in 2012.