Elon Musk has earned his fair share of detractors in and out of politics this year, but it is OpenAI chief Sam Altman who seems to have best mastered the Musk-belittling soundbite. Altman and Musk co-founded OpenAI as a nonprofit in 2015,

In an interview with Bloomberg, Altman says OpenAI is “not for sale” and the bid is the latest of “tactics, many, many lawsuits, all sorts of other crazy stuff, now this” for the “competitor” Musk to “slow us down.

Sam Altman is leaving no room for doubt about his views on an Elon Musk-led bid to take control of OpenAI. In a letter to OpenAI staff Monday, the CEO put the words “bid” and “deal” in scare quotes and said the startup’s board has no interest in the offer.