If you thought the AI wars were mostly about flashy demo reels and hiring sprees, welcome to the legal trenches. Elon Musk’s AI firm xAI has filed suit accusing one of its former engineers, Xuechen Li, of copying confidential files about Grok — xAI’s flagship chatbot — and taking them with him when he left for a job at OpenAI. The complaint, filed in a California federal court, asks a judge to yank devices and cloud access, force the return of any stolen materials, and temporarily bar Li from working for rivals while investigators sort the damage.

According to the complaint, the narrative xAI lays out is stark and procedural: Li allegedly copied files from an xAI-issued laptop to one or more personal devices in late July — right after accepting an offer at OpenAI and after liquidating millions in xAI stock. xAI claims he took “cutting edge AI technologies with features superior to those offered by ChatGPT,” and that those files could give competitors a serious head start or save them “billions in R&D dollars and years of engineering effort.” The suit says Li renamed and compressed files, deleted browser history and otherwise took steps to conceal the transfers.

xAI also alleges Li asked the company to repurchase shares he’d been granted — roughly $7 million worth — just before he left. That part of the story is what many observers flagged as suspicious: large, quick stock moves and a rapid exit can look like the last act in a premeditated plan (at least in the telling of the company suing).

Beyond damages, xAI is pressing for immediate, injunctive relief: a temporary restraining order that would force Li to surrender personal devices and login credentials, and temporarily block him from working at OpenAI or any competitor until xAI can forensically determine what was copied and secure its IP. That kind of emergency request is relatively common when firms fear a live leak could irreparably change their competitive position. The company’s urgency is also tactical: once code or data escapes into a competitor’s systems, it becomes vastly harder to contain.

This lawsuit arrives in the middle of a bruising talent war. Top AI researchers are being chased with compensation packages that read like lottery numbers; defense and non-compete issues are now everyday concerns for startup lawyers. When a small group of engineers can move the needle for multi-billion-dollar models, companies start treating employee devices and transfer logs like state secrets. xAI’s filing is the latest signal that the AI industry is increasingly leaning on the courts to police the movement of people and code.

It’s also part of a string of legal fights Musk and xAI have picked with rivals. In recent weeks, xAI has sued OpenAI and Apple over alleged anticompetitive arrangements — a larger, strategic fight over market access and distribution that contextualizes why xAI is both litigious and protective right now.