Why Is Apple Suing OpenAI? Chang Liu, Tang Tan and the Trade-Secrets Case Explained
Apple is suing OpenAI, io Products and two former Apple employees in federal court, alleging that confidential hardware, manufacturing and supply-chain information was improperly taken and used to accelerate OpenAI's consumer-device program. The lawsuit was filed on July 10, 2026, in the U.S. District Court for the Northern District of California.
The headline phrase Apple sues OpenAI can be misleading without the legal context. This is not a lawsuit over ChatGPT answers, copyright in AI training data or the existing ChatGPT integration in Apple Intelligence. Apple's complaint says that commercial agreement is not at issue. The case instead focuses on alleged trade-secret misappropriation and alleged breaches of employee intellectual-property agreements.
Source: Wikimedia Commons / Nils Huenerfuerst (CC0)
Key takeaways
- Apple's allegations are not yet proven. The complaint is Apple's account of events; the court has not ruled that OpenAI, Chang Liu or Tang Tan misappropriated trade secrets.
- Chang Liu is accused of post-employment access. Apple alleges that the former iPhone electrical engineer retained an Apple computer, discovered he could still reach a network repository and downloaded dozens of confidential files while working for OpenAI.
- Tang Yew Tan is accused of using Apple knowledge in recruiting. Apple alleges that OpenAI's chief hardware officer used internal project codenames and asked candidates to bring Apple parts, prototypes or detailed design material to interviews.
- The complaint also targets OpenAI's recruiting and supplier practices. Apple claims the conduct extended beyond two people and included attempts to obtain information through current employees and trusted manufacturing partners.
- OpenAI denies wanting competitors' secrets. It said it was reviewing the filing and stated that it has no interest in other companies' trade secrets.
What exactly did Apple file?
The case is Apple Inc. v. Liu et al., case number 5:26-cv-07078. The named defendants are Chang Liu, Tang Yew Tan, OpenAI Foundation, OpenAI Group PBC and io Products LLC. Apple's complaint asserts claims under the federal Defend Trade Secrets Act and separate breach-of-contract claims against Liu and Tan.
Source: U.S. District Court filing via 9to5mac.com
The complaint was filed in the Northern District of California and demands a jury trial. A complaint starts the civil case; it is not a judgment and does not establish that the allegations are true.
Apple is seeking preliminary and permanent injunctions, the return of company property, an order preventing use or disclosure of its alleged trade secrets, preservation of evidence, compensatory damages, unjust-enrichment damages or a reasonable royalty, exemplary damages, legal fees and a jury trial. A request for relief is not the same as relief granted: the company must persuade the court that the legal and factual requirements are met.
Timeline of the Apple-OpenAI dispute
| Date | Event | Why it matters |
|---|---|---|
| June 10, 2024 | Apple announces Apple Intelligence and a ChatGPT integration. | The companies begin a public product partnership, which Apple now says is separate from this lawsuit. |
| May-July 2025 | OpenAI and Jony Ive announce their hardware collaboration; the io Products team later officially merges with OpenAI. | OpenAI gains a dedicated consumer-hardware organization with deep former-Apple experience. |
| January 22, 2026 | Chang Liu leaves Apple for OpenAI, according to the complaint. | Apple alleges that he did not complete parts of its exit process and failed to return at least one Apple computer. |
| Around February 9, 2026 | Apple alleges that Liu discovered continued access to an internal network repository. | The alleged access and later downloads form a central part of Apple's trade-secret claim. |
| February 2026 | Apple says it wrote to OpenAI about possible misuse of confidential information. | Apple alleges that OpenAI did not respond, a point OpenAI may contest or contextualize later. |
| July 10, 2026 | Apple files the federal complaint. | The accusations become a formal civil case and enter the discovery and motion process. |
Why Apple sues OpenAI: the core theory of the case
Apple's central theory is not simply that OpenAI hired valuable engineers. California generally permits employees to change jobs, and experience or general skills do not automatically become a former employer's property. The complaint instead alleges specific acts that Apple says crossed the line: unauthorized access, copying files, soliciting confidential details in interviews, retaining internal documents and using supplier relationships to reproduce proprietary processes.
That distinction will be crucial. To win a federal trade-secret claim, Apple must identify protectable information with sufficient precision, show that the information had economic value because it was secret, demonstrate reasonable efforts to protect it and prove acquisition, disclosure or use through legally improper means. OpenAI and the individual defendants will have opportunities to deny the facts, challenge whether particular information qualifies as a trade secret, dispute attribution and contest causation or damages.
Who is Chang Liu, and what does Apple allege?
According to the complaint, Chang Liu spent about eight years at Apple as a senior system electrical engineer for the iPhone product line before joining OpenAI in January 2026. Apple says he worked on sensitive product-development programs and was bound by an Intellectual Property Agreement requiring him to protect confidential information after leaving.
Source: U.S. District Court filing via 9to5mac.com
Apple alleges that Liu retained an Apple-owned computer and later discovered that an authentication vulnerability still allowed him to reach internal network storage. The filing presents these claims as evidence of intentional post-employment access.
The filing alleges that Liu left Apple on January 22, did not respond to requests concerning device return and exit procedures, and failed to return at least one company computer. Apple further alleges that he remained in contact with then-Apple employee Yu-Ting “Alyssa” Peng, who later joined OpenAI.
The most widely quoted allegation concerns an authentication vulnerability. Apple says Liu attempted to access a cloud-based internal repository on or around February 9 and discovered that access still worked. The complaint quotes a message in which he allegedly wrote that he had found he could access the storage and found it amusing. Apple says he subsequently downloaded dozens of confidential presentations, spreadsheets, PDFs and work product, including a collection exceeding 1,000 pages.
One alleged download concerned the manufacture and testing of multi-layer or main logic boards, including workflows, diagnostic equipment and interpretation of test data. Apple characterizes that information as accumulated operational knowledge that would be valuable to a hardware developer. These remain allegations; Liu's response and any supporting or contradictory evidence will be tested through the litigation process.
Who is Tang Tan, and why is he named?
Tang Yew Tan, usually called Tang Tan, spent roughly 24 years at Apple and most recently served as vice president of product design for iPhone and Apple Watch, according to the complaint. He co-founded io Products and is now OpenAI's chief hardware officer. His long access to product design, manufacturing and supplier information makes him central to Apple's theory that OpenAI's hardware effort benefited from confidential Apple knowledge.
Source: U.S. District Court filing via 9to5mac.com
Apple alleges that Tan used internal project codenames during interviews and directed candidates to bring physical components from their Apple work for “show and tell.” The defendants have not yet presented their full response in court.
Apple alleges that Tan used internal Apple project codenames to ask candidates about unreleased projects. It also claims that candidates were asked to prepare detailed technical presentations, discuss tools and supplier processes, provide CAD or design artifacts and bring actual parts such as batteries, systems-in-package, logic boards, shields and housings.
The complaint further alleges that Tan retained or obtained an internal Apple “Need to Know” document describing offboarding and security procedures. Apple says OpenAI personnel referred to it as a checklist Tan had assembled and shared it with recruits before they announced their departure, allegedly giving them advance knowledge of Apple's forensic and security checks. Whether the document was actually obtained, how it was used and who knew about it are issues likely to be contested.
Why OpenAI and io Products are defendants
Apple is trying to establish that the alleged conduct was organizational rather than a series of isolated employee actions. The complaint claims that more than 400 former Apple employees work at OpenAI. That number is Apple's allegation, and the mere hiring of former employees is not itself unlawful. The legal issue is whether OpenAI or io knowingly acquired, used or encouraged disclosure of information that remained protected as Apple's trade secrets.
Source: Wikimedia Commons / HaeB (CC BY-SA 4.0)
OpenAI moved decisively into consumer hardware through its collaboration with Jony Ive and the io Products team. Apple argues that this new hardware operation used confidential Apple knowledge as a shortcut; OpenAI denies having an interest in competitors' trade secrets.
Apple also alleges that OpenAI and io targeted Apple's supplier network. One example in the filing claims that a trusted partner performed an Apple-developed metal-finishing process for OpenAI while believing Apple had authorized the work. The supplier is not identified in the public complaint. This part of the case could become especially important because manufacturing know-how often exists across a network of employees, contractors and vendors rather than in one document.
OpenAI's hardware strategy is real, even though the exact device remains largely undisclosed. In 2025, OpenAI announced that the io team would merge into OpenAI, while Jony Ive and LoveFrom would take broad design and creative responsibilities. The company described an ambition to move beyond traditional products and interfaces. For more context on Apple's own AI product development, see Zerlo's background article on the Apple Veritas chatbot and Siri testing.
What has OpenAI said?
❝ We have no interest in other companies’ trade secrets. We remain focused on building innovative technology that empowers people everywhere. ❞
Statement provided by OpenAI spokesperson Drew Pusateri after the filing
OpenAI said it was reviewing the complaint when the case became public. The statement above is a broad denial of interest in competitors' secrets, but it is not yet a detailed answer to Apple's paragraph-by-paragraph allegations. The formal response may include motions attacking the legal sufficiency of the complaint, factual denials, affirmative defenses or counterclaims.
What Apple must prove under trade-secret law
The Defend Trade Secrets Act does not give a company ownership over everything its employees know. In simplified terms, Apple must prove that the information at issue qualifies as a trade secret and that one or more defendants misappropriated it. The statutory definition focuses on information that derives independent economic value from not being generally known and that the owner has taken reasonable measures to keep secret.
| Legal question | Apple's position in the complaint | What remains unresolved |
|---|---|---|
| Was the information secret and valuable? | Apple describes confidential product designs, testing methods, manufacturing workflows, supplier information and unreleased projects. | The court will need a sufficiently specific identification of the claimed trade secrets and evidence of their economic value. |
| Did Apple take reasonable protective measures? | The complaint describes access controls, confidentiality agreements, device-return procedures, monitoring and supplier restrictions. | Defendants may challenge whether those controls were reasonable for each claimed secret, especially where alleged access remained active. |
| Was information acquired by improper means? | Apple alleges unauthorized repository access, copying, interview solicitation, retained documents and use of supplier knowledge. | The evidence must show who did what, whether access was authorized and what OpenAI or io knew. |
| Was a trade secret used or disclosed? | Apple says the information benefited recruiting, hardware design, manufacturing and partner operations. | Apple must connect specific protected information to actual use or threatened use, not merely show overlapping expertise. |
| Did Apple suffer harm? | Apple alleges lost competitive advantage, unjust enrichment and threatened harm to future products. | Damages, causation and the scope of any injunction would require evidence beyond the complaint. |
The contract claims are narrower. Apple alleges that Liu and Tan signed intellectual-property agreements and breached continuing confidentiality and property-return obligations. Those claims depend on the agreements' language, the conduct proved and any defenses available under California law.
What could the case mean for future AI hardware?
The lawsuit does not automatically stop OpenAI from releasing a device. A complaint alone has no such effect. The immediate risk is procedural: Apple can ask for expedited discovery and preliminary injunctive relief, while OpenAI may have to preserve and disclose recruiting records, internal communications, design histories, device-development documents and supplier interactions.
Four consequences are plausible if Apple supports its allegations with strong evidence:
- Development constraints: a court could restrict possession or use of specifically identified Apple trade secrets and require contaminated work to be isolated or redesigned.
- Launch uncertainty: discovery disputes and injunction motions could complicate schedules, although delay is not inevitable.
- Supplier caution: shared manufacturers and specialist partners may tighten authorization, information barriers and documentation before accepting OpenAI work.
- Stricter hiring controls: technology companies may demand cleaner interview practices that prohibit candidates from presenting confidential files, prototypes, project codenames or former-employer parts.
The case could also end without a trial through dismissal, settlement or negotiated safeguards. OpenAI may show that its products were independently developed, that disputed knowledge was general expertise, that no protected material reached decision-makers or that Apple's alleged secrets were not used. At this early stage, confident predictions about liability or the fate of OpenAI's device would be premature.
Why the Apple-OpenAI partnership is not the lawsuit's subject
Apple and OpenAI became public partners in 2024 when Apple announced ChatGPT access through Siri and systemwide Writing Tools. The complaint expressly states that the written agreement governing that integration is not at issue and that the alleged trade-secret acts do not arise from it. That matters because the companies can be partners in AI services while competing in hardware.
Commercially, however, the dispute may make the relationship more difficult. Apple has an incentive to preserve flexibility among external AI providers, while OpenAI is developing products that could eventually compete for users' attention outside the smartphone. The lawsuit transforms that strategic tension into a discovery-heavy legal conflict, but it does not by itself terminate the ChatGPT integration.
FAQ
Why is Apple suing OpenAI?
Apple alleges that OpenAI, io Products and former Apple employees Chang Liu and Tang Tan improperly acquired or used confidential hardware, manufacturing, recruiting and supplier information to support OpenAI's hardware business. The case asserts federal trade-secret claims and contract claims. The allegations have not been proven.
Did Chang Liu steal Apple files?
Apple alleges that Liu accessed an internal network repository after leaving, downloaded dozens of confidential files and retained at least one company computer. Those are claims in a complaint, not established facts. Liu can dispute them, and Apple must prove its account with admissible evidence.
What is Tang Tan accused of doing?
Apple alleges that Tan used internal project codenames in OpenAI interviews, solicited confidential project details, directed candidates to bring physical Apple components and possessed or used an internal offboarding document. No court has ruled that he committed those acts or that any information legally qualifies as a trade secret.
Is Apple suing OpenAI over ChatGPT or Apple Intelligence?
No. Apple's complaint says the companies' written agreement for integrating ChatGPT into Apple Intelligence is not at issue. The lawsuit concerns alleged misuse of Apple hardware and manufacturing information.
Can Apple block OpenAI's hardware launch?
Apple can request an injunction, but it must satisfy the legal requirements and identify the trade secrets or threatened misuse with adequate specificity. Filing the complaint does not automatically block a product. Any restriction would depend on a court order or a settlement.
Has OpenAI admitted using Apple's trade secrets?
No. OpenAI said it has no interest in other companies' trade secrets and was reviewing the filing. A detailed formal response was not yet available when this article was published on July 12, 2026.
What happens next in the lawsuit?
The defendants are expected to respond through answers or motions. The parties may then litigate injunction requests, document preservation, discovery and the precise definition of the alleged trade secrets. The case could proceed toward trial, settle or be narrowed or dismissed through motions.
Bottom line
The answer to “why Apple sues OpenAI” is specific: Apple believes OpenAI's hardware operation obtained a shortcut through confidential Apple files, project knowledge, interview practices and supplier processes. Chang Liu is central to the alleged post-employment access and downloads; Tang Tan is central to the alleged recruiting and hardware-information strategy.
What is confirmed is that Apple filed the case, identified concrete categories of allegedly protected information and asked for injunctions and damages. What remains unresolved is whether the events occurred as described, whether the information is legally protectable, what OpenAI knew, whether any secret was actually used and whether Apple suffered compensable harm. Until evidence is tested and the defendants formally respond, the complaint should be read as a detailed allegation, not a verdict.