Sam Altman faced pointed questions about his financial ties to the Everett, Wash., fusion startup during testimony in the Musk v. Altman trial, as Congress separately raised conflict-of-interest concerns.

Satya Nadella also testified about Microsoft’s partnership with OpenAI and the company’s support of Altman.

While the trial exploring Elon Musk’s case against OpenAI’s other cofounders and Microsoft has covered territory ranging from the breakup of the founders in 2018 to Altman’s firing and rehiring in 2023, the jurors will be considering a set of fairly narrow questions.

The trial pits two of tech's most famous personalities against each other and could lead to seismic changes for the maker of ChatGPT.

Lawyers for Elon Musk, OpenAI and Microsoft delivered closing statements Thursday in their courtroom battle, setting the stage for jury deliberations next week. A lawyer for Musk argued that it was OpenAI’s 2023 deal with Microsoft that violated OpenAI’s charitable mission,

Sam Altman, OpenAI’s chief executive, is defending the company against Elon Musk’s allegations that the start-up betrayed its founding mission. He said Mr. Musk pushed for the company to become part of Tesla.