As investor jitters grow, the loss-making ChatGPT firm’s vast spending commitments test the limits of Silicon Valley optimism

It is the $1.4tn (£1.1tn) question. How can a loss-making startup such as OpenAI afford such a staggering spending commitment?

Answer that positively and it will go a long way to easing investor concerns over bubble warnings in the artificial intelligence boom, from lofty tech company valuations to a mooted $3tn global spend on datacentres.