But they also get a whole bunch of AI Services from Cursor. Other comments have noted that xAI has fallen on bad times (idk one way or the other) so perhaps they were going to spend $5B on getting these services elsewhere, anyway.
SpaceX spending $1B a month on various AI services seems ~plausible
(EDIT - Or maybe it's an IP transfer, or maybe it's over a longer time horizon. Idk but SpaceX clearly expects value from 'our work together' even if they don't exercise.)
Cursor has no AI services, they do not develop their own frontier models. I see no reason to understand why $10bn for Cursor's services is an advantage xAI versus say a $10bn deal with Anthropic, OpenAI or Google.
$1B per month on AI services does not seem remotely plausible to me... Engineers don't consume that many tokens...
And on the AI development side they're the ones providing compute in the form of a "million H100 equivalent Colossus training supercomputer"... On top of the cash.