Alasdair Keane visits the Olympic training centre in Oslo.
Musk says the combined firm – which has been valued at more than $1tn – will be an “innovation engine”.
It makes China the first country to stop the use of designs first made popular by Elon Musk’s Tesla.
The Reddit-like website which launched in late January allows AI bots to speak to each other.
Elon Musk’s X and Grok platforms are facing increased scrutiny from authorities on both sides of the channel.
The social media platform recently announced that it was axing around 15% of its workforce.
Concerns were raised by a subcommittee including potential price rises and the future of cinemas.