Apple Sues OpenAI for Trade Secret Theft in Landmark Silicon Valley Lawsuit

The Silicon Valley alliance that once looked like a tech industry masterstroke has collapsed into one of the most explosive corporate lawsuits in years. Apple filed suit against OpenAI on July 10 in the U.S. District Court for the Northern District of California, alleging a systematic, multi-year campaign to extract its most sensitive hardware trade secrets — and accusing the company’s own Chief Hardware Officer of running the operation.

The complaint is a 35-page indictment of what Apple describes as a culture of sanctioned espionage inside OpenAI’s hardware division, one that it says has fundamentally corrupted the AI lab’s nascent consumer device ambitions. “OpenAI’s hardware business now rests on the shakiest of foundations,” the filing states, “rotten to its core by its illegal reliance on misappropriated trade secrets.”

The Tang Tan Accusations

At the center of the lawsuit is Tang Tan, who spent 24 years at Apple — ultimately rising to Vice President of Product Design for the iPhone and Apple Watch — before departing in late 2024 to become OpenAI’s Chief Hardware Officer. Apple alleges that within months of joining OpenAI, Tan began structuring job interviews as intelligence-gathering operations.

According to the complaint, Tan directed Apple employees who were interviewing at OpenAI to bring “actual parts” from Apple projects to their interviews as part of “show and tell” sessions. He allegedly used Apple’s confidential internal project code names during these recruitment conversations — a signal that he retained detailed institutional knowledge and was actively weaponizing it. The filing also accuses Tan of coaching departing Apple employees on how to evade the company’s standard security exit procedures, including guidance on bypassing document-return protocols.

Apple is not alleging that Tan acted recklessly or opportunistically. The complaint frames his alleged conduct as deliberate and systematic — the work of someone who understood exactly what he was taking and why it was valuable.

The Chang Liu Evidence Trail

Apple’s second named defendant, Chang Liu, presents a more concrete evidentiary case. Liu spent eight years at Apple as a senior systems electrical engineer before joining OpenAI in early 2026. According to the lawsuit, Liu failed to return an Apple-issued laptop upon his departure and subsequently used that device to download a trove of confidential technical documents — including specifications, engineering presentations, and details about unannounced technologies, features, and products.

The complaint also alleges that Liu shared Apple proprietary information with other job applicants during the period he was transitioning between companies, effectively spreading confidential materials beyond OpenAI’s own organization. Among the most specific claims: Apple says a proprietary metal-finishing technique developed internally has since appeared in OpenAI’s hardware prototypes.

The scale of the broader talent migration adds weight to Apple’s narrative. More than 400 former Apple employees now work at OpenAI — a number the filing references as context for what it characterizes as a structural pattern rather than individual misconduct.

The Hardware Stakes

The lawsuit’s timing is not accidental. OpenAI has been laying the groundwork for a major consumer hardware push with growing urgency. In May 2025, the company acquired io, the hardware design startup founded by former Apple design chief Jony Ive, for $6.4 billion — a figure that underscored how seriously OpenAI views physical products as the next platform frontier. A Codex Micro developer keypad is scheduled to launch on July 15, while a broader screenless AI device and, eventually, a full smartphone rival to the iPhone are in various stages of development.

Apple’s lawsuit arrives precisely as OpenAI is attempting to crystallize those ambitions into products. By seeking a court order to bar OpenAI from using or disclosing the allegedly stolen trade secrets — and demanding the return of all confidential materials — Apple is aiming directly at the engineering foundation of its rival’s hardware program. If a judge grants an injunction, OpenAI’s device roadmap could face delays measured not in months but in years.

The Collapse of a Partnership

The lawsuit represents a jarring reversal for two companies that, as recently as 2024, appeared to be entering a mutually beneficial long-term relationship. That year, Apple integrated ChatGPT directly into iOS as part of Apple Intelligence, giving OpenAI access to hundreds of millions of iPhone users while providing Apple with a credible AI assistant capability it had struggled to build internally. The deal was hailed as one of the most significant tech partnerships of the decade.

Now Apple is arguing in federal court that its partner has been systematically stealing its intellectual property. The reputational and legal implications cut both ways. For Apple, the lawsuit signals that it views OpenAI’s hardware ambitions as an existential competitive threat — serious enough to sacrifice a commercial relationship worth significant revenue to both sides. For OpenAI, the allegations arrive at the worst possible moment, just as the company is preparing for what could be a transformative product cycle and navigating a complex restructuring into a for-profit entity.

OpenAI’s Response

OpenAI has offered a terse denial. “We have no interest in other companies’ trade secrets,” a spokesperson said in a statement. The company has not addressed the specific allegations regarding Tang Tan’s alleged conduct during job interviews or the Liu laptop claims. Legal observers expect OpenAI to file a motion to dismiss, arguing that the claims are overstated and that the conduct described — even if accurate — does not meet the threshold for trade secret misappropriation under federal law.

What Comes Next

Apple is asking the court to issue a preliminary injunction halting OpenAI’s use of any materials derived from the alleged theft, force the return of confidential documents, and preserve evidence pending a full trial. The Northern California district is experienced with exactly this category of trade secret litigation — it has adjudicated many of Silicon Valley’s most consequential IP disputes — which means the case could move relatively quickly to a hearing on injunctive relief.

The broader industry implications are significant. If Apple prevails, it will establish a powerful legal precedent discouraging the kind of aggressive talent-poaching that has characterized AI’s explosive growth phase. If OpenAI successfully defends itself, it may embolden other AI labs to continue building hardware teams from the ranks of device-first incumbents like Apple and Samsung. Either way, the case will define the boundaries of acceptable competition in one of the most consequential technological transitions in decades.