Apple has filed a high-profile lawsuit against OpenAI, accusing the AI company of stealing trade secrets to help build consumer hardware, according to reporting aggregated from Law Commentary, TIKR, 9to5Mac and others.

At the center of the case is a former Apple engineer identified as Liu. According to coverage from MSN and The Economic Times, Apple claims Liu took confidential materials when he left to join OpenAI — including a MacBook with sensitive files — and stayed in contact with a colleague to keep tapping internal information.

The most eye-catching piece of alleged evidence is a message. The lawsuit says Liu discovered he could still reach Apple's internal file servers after joining OpenAI and, rather than reporting the security gap, joked about it, writing "LOL, I found out I can access..." That line has become a centerpiece of Apple's filing.

Apple frames the case as bigger than one engineer. According to the Economic Times, the company alleges OpenAI orchestrated a campaign to recruit Apple's engineers and designers, and 9to5Mac reports the suit reveals how many former Apple employees now work there. Coverage from MSN also points to a strained relationship between Tang Tan and John Ternus — Tan's former boss and Apple's incoming chief executive.

The dispute has spilled into public feuding. Gizmodo reports that Apple's lawsuit sparked another online spat between Elon Musk and OpenAI's Sam Altman.

Why it matters: As Apple races to catch up in AI and OpenAI reportedly eyes its own devices, this fight could reshape how talent and technology move between Silicon Valley's biggest players — and where the line falls between hiring rivals' engineers and stealing their secrets.