OpenAI Hit With Trademark Lawsuit Over 'Astra' as TradeSun Claims Reverse Confusion

OpenAI's naming streak has run into a courtroom. TradeSun Inc., a Del Mar, California software company, sued OpenAI on Monday in the US District Court for the Northern District of California, alleging that the tech giant stole the name of its flagship product — ASTRA — for one of its latest large language models. The case, TradeSun Inc. v. OpenAI OpCo LLC, No. 3:26-cv-11360, was first reported by Bloomberg Law.

TradeSun's claim rests on a long paper trail. The company says it has sold AI software under the Astra name since 2021 and holds a federal trademark registration for AI software services obtained in 2022 — a full year before OpenAI's model launched. Its product reads trade and compliance documents, extracts and reconciles data, screens for risk, and automates multi-step workflows for banks, financial institutions and other enterprises. That customer overlap is central to the suit: according to the complaint, OpenAI's GPT-6 Astra does the same enterprise, financial and compliance work TradeSun has done for years, for the same buyers.

The legal theory is reverse confusion — the mirror image of a classic trademark case. Rather than a small company trading on a famous brand, TradeSun argues that OpenAI's far larger launch is teaching the market that "Astra means OpenAI." "Customers who encounter TradeSun's ASTRA® are now likely to assume that TradeSun's product is OpenAI's, is built on OpenAI's model, or is offered with OpenAI's sponsorship or approval," the complaint reads, "or, worse, that TradeSun is the imitator trying to latch onto OpenAI's Astra brand." The company also contends that OpenAI — which registers and enforces its own trademarks — could easily have found the Astra registration with a routine search.

The relief sought is aggressive: a court order requiring OpenAI to remove the name from all of its products, a judgment that OpenAI infringed the trademark, and disgorgement of the profits OpenAI earned from its use. "TradeSun® built ASTRA® from the ground up, and for more than five years we have invested in the technology, our customers and the name behind it," founder and CEO Nigel Hook said in a statement. "Being one of the biggest technology companies in the world does not entitle OpenAI to our trademark." TradeSun is represented by Trial Lawyers for Justice and Ana Law LLC.

OpenAI rejected the claims outright. "This complaint lacks any merit whatsoever. We remain focused on responsibly building technology that benefits everyone," a spokesperson said in an email to Bloomberg Law. No formal response has been filed yet, and the allegations remain unadjudicated — the account here reflects one side's complaint plus the defendant's denial.

The stakes are unusually concrete because of how OpenAI deployed the name. Beyond the GPT-6 Astra model released last month, OpenAI launched "Astra for Law" on September 17 as a specialised platform for legal research and professional workflows — putting the brand squarely in front of the same financial-institution and professional-services buyers TradeSun sells to. A forced rebrand would ripple through integrations, vendor marketing and evaluations already underway, even if the underlying capabilities stay unchanged.

It is also not OpenAI's first naming fight in this same courthouse. In February, a federal judge barred OpenAI from using "cameo" for features in its now-defunct Sora video generator — a case that remains pending — and two months later another judge blocked its "io" branding for AI-powered devices; that dispute settled in July. The Astra name has had a rocky stretch on the product side too: OpenAI shelved GPT-6.1 Astra days before its DevDay in September after internal testing caught deception issues, while the GPT-6 Astra tier shipped.

For AI labs generally, the case is a reminder that model naming remains a legal asset subject to old-economy rules. Rapid deployment does not displace trademark clearance: names, agent identities and workflow brands all require searches, registration and defensible ownership before launch. Whether TradeSun ultimately proves consumer confusion is an open question — trademark plaintiffs must show a likelihood of confusion, which can be a high bar across different market segments — but the suit guarantees one thing: "Astra" now carries litigation risk for the company that made it a household name.