The witness OpenAI didn't want to call.

CNBC's live blog flagged it Wednesday afternoon Oakland time. An attorney for OpenAI told Judge Yvonne Gonzalez Rogers that Greg Brockman has been given 48 hours' notice to take the stand. Reuters, NBC Bay Area, and ABC7 confirmed the timing. Brockman could be sworn in as soon as Thursday, depending on how long Jared Birchall's testimony runs.

If you're wondering why this matters more than any other witness rotation in this trial, here's the answer in one sentence: Brockman is the only person in the courtroom who admitted in writing, in 2017, that the nonprofit pledge was already a lie.

The diary entry.

Court filings, prior reporting, and Musk's own deposition all point to the same document. A 2017 personal diary entry by Brockman, recovered in discovery, refers to the early commitment to keep OpenAI as a nonprofit research lab as something he and Sam Altman had quietly stopped believing in. The phrase 'this is the only chance we have to get out from Elon' has been previewed by Musk's legal team as a centerpiece exhibit.

Steven Molo, opening for Musk, said the quiet part loud Tuesday morning: 'Scam Altman and Greg Stockman stole a charity.' He used the wrong name on purpose. That is the kind of opening line you only deliver when you have the document to back it up.

OpenAI's defense, led by William Savitt, has been clean and consistent. There was no formal commitment to permanent nonprofit status. The for-profit conversion was disclosed. Microsoft was a counterweight to Google, not a betrayal of the mission. Day three of the trial saw Savitt cross-examining Musk on a $38 million donation Musk has repeatedly described as $100 million in public posts. We covered that one this morning.

The Brockman testimony breaks that defense or hardens it. There is no middle outcome.

What the 48-hour notice tells you.

Court rules require notice for witness scheduling. The 48-hour clock confirms Brockman is locked into the calendar this week. Birchall's testimony runs first. Then Brockman. Then likely Altman. The order matters because each witness's testimony anchors the framing for the next.

Birchall is the Musk family office chief and a hostile-witness scenario. His credibility is the lesser stake. Brockman's credibility is the case. If Savitt can keep him on a clean narrative, OpenAI rebuilds the wall Molo is trying to knock down. If Molo can drag the diary entry into the record and pin Brockman to it under oath, the charitable-trust argument moves from theoretical to documented.

The judge knows that. The lawyers know that. The Polymarket and Kalshi traders know that. Musk's win probability has been ranging 42 to 48 percent all week. A successful Brockman cross either pushes that into 60s territory or kills it down to 30s by Friday.

What's at stake on Thursday.

The remedies Musk is seeking are not symbolic. Removal of Altman and Brockman from OpenAI's leadership. Unwinding of the for-profit conversion. $134 billion in damages. A return to charitable-trust governance for the underlying nonprofit.

Liability through May 18. Remedies hearings if the jury finds for Musk. Three weeks of trial. We are eight days in.

And the Anthropic IPO sits in the background of all of it. October. $350 billion target. Same nonprofit-to-for-profit conversion structure. If the jury rules that Altman and Brockman 'stole a charity,' Anthropic's S-1 has to disclose the precedent. That is a writedown waiting on a verdict.

The Brockman cross is why we're here.

Musk's testimony was emotional theater. Birchall's testimony will be procedural. Altman's testimony will be the closer's argument.

Brockman is the document witness. He's the one who wrote down, in 2017, that the thing the nonprofit promised was already gone. The defense has to convince a jury that what someone wrote in a private diary doesn't reflect what the institution actually did. That is hard to do under direct examination. It is harder under cross.

If you're tracking only one development out of this trial, this is it. Everything between the opening on Tuesday and the verdict in mid-May is preface. Brockman on the stand, with the diary in evidence, is the chapter.

We'll be on the live blogs the second he's sworn in.