Evidence at trial showed that Musk attempted to pursue AGI at Tesla starting in 2017 before he left the board of OpenAI. He was unsuccessful in that endeavor and later restarted his efforts in xAI after the success of ChatGPT.

Musk leaves the board in 2018 I think. And something happens in DX-754 where they've pivoted to AI in SpaceX around then too. I had a lot of trouble telling what "AI" meant in late 2017 at Tesla.

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Sept 1, 2017 DX-669: Funding paused confirmation. Elon is still on the board for a while. DX-707 specifies the board as of Sept 26, 2017, and even suggests adding Shivon, Jared, Sam Teller.

Jan 31, 2018 DX-748: Elon is still discussing things with Greg. Elon: "The only paths I can think of are a major expansion of OpenAI and a major expansion of Tesla AI. Perhaps both simultaneously"

Feb 3, 2018 DX-754: Sam Teller says Elon "just suggested we use SpaceX email for AI stuff so switching over to that"

Feb 4, 2018 DX-755: Sam Teller and Shivon Zilis discuss disabling Openai

Feb 20, 2018 DX-770: Elon officially leaves board (first document I see specifying)