Sam Altman delivered testimony in the civil trial between himself and Elon Musk. JOSH EDELSON / AFP via Getty Images

Sam Altman faced intense, at times awkward, cross-examination from Elon Musk's attorney.

Altman was peppered with questions over whether he lies to advance his business interests.

"I believe I am an honest and trustworthy business person," he testified in the Musk v. Altman trial.

Sam Altman on Tuesday came under fierce grilling from Elon Musk's lead trial attorney in an increasingly awkward courtroom exchange that saw the OpenAI CEO confronted with allegations of lying and deception.

Musk's attorney, Steven Molo, opened his cross-examination of Altman with the blunt question: "Are you completely trustworthy?"

"I believe so," Altman told the federal California jury in the civil trial of Musk's lawsuit against Altman and OpenAI.

"You don't know whether you're completely trustworthy?" Molo followed up, forcing Altman to respond, "I'll just amend my answer to yes."

Molo then peppered…