He's been somewhat critical of OpenAI. Specifically the part about it pivoting to a for-profit business.
> I’m still confused as to how a non-profit to which I donated ~$100M somehow became a $30B market cap for-profit. If this is legal, why doesn’t everyone do it?
https://twitter.com/elonmusk/status/1636047019893481474
> I donated the first $100M to OpenAI when it was a non-profit, but have no ownership or control