Elon Musk and Sam Altman, who were longtime friends and helped start OpenAI, are in an extended legal battle that now involves Apple.

The OpenAI chief executive accused his fellow billionaire of making a "remarkable claim."

Relations between the two tech bosses have soured amid a slew of lawsuits and social media digs.

Elon Musk and Sam Altman, who were longtime friends and helped start OpenAI, are in an extended legal battle that now involves Apple.

Billionaire accuses Apple of ‘unequivocal antitrust violation’ over app rankings, prompting testy response