California AI Company Sues OpenAI Over “Astra” Trademark: What Reverse Confusion Means for Startups

Traditional, or “forward,” confusion usually involves a later company adopting a mark similar to an established brand, leading customers to believe the later company’s product comes from or is sponsored by the established brand.

Reverse confusion turns that around. The later user is much larger or more prominent, and its use becomes so visible that customers encountering the earlier, smaller trademark owner may believe its product comes from, or is affiliated with, the larger junior user.

The Ninth Circuit expressly recognizes this theory. In Marketquest Group, Inc. v. BIC Corp., 862 F.3d 927 (9th Cir. 2017), the court explained that reverse confusion occurs when consumers dealing with the senior user mistakenly believe they are dealing with the junior user. It also made clear that reverse confusion is not a separate claim; it is a theory for establishing likelihood of confusion in an ordinary infringement case.

According to federal trademark records, TradeSun’s ASTRA registration covers software-as-a-service offerings using artificial intelligence for document classification, data extraction, and data processing. It issued May 31, 2022 and claims first use in commerce on May 21, 2021.

OpenAI introduced GPT-6 Astra in September 2026 as part of its AI-model lineup, available through ChatGPT and enterprise and developer channels. According to the complaint, the companies’ products and potential customers overlap enough that OpenAI’s use of Astra creates a likelihood of confusion.

Those are TradeSun’s allegations. OpenAI has not conceded that the products are related, that consumers are likely to be confused, or that TradeSun is entitled to any relief.

No. Priority matters in trademark law, but earlier use and federal registration do not by themselves decide infringement. The central question remains whether the challenged use is likely to cause consumer confusion.

Published Ninth Circuit authority, including AMF Inc. v. Sleekcraft Boats and Ironhawk Technologies, Inc. v. Dropbox, Inc., 2 F.4th 1150 (9th Cir. 2021), evaluates that question through a fact-specific analysis that may include:

These factors are not a mechanical scorecard. An identical word can sometimes coexist lawfully for unrelated goods or services, while similar marks can create actionable confusion where commercial contexts substantially overlap.

Imagine Startup A has legitimately used a mark for years. Then a much larger company launches a product under the same or a similar name. Customers may begin asking whether Startup A is a smaller version of the larger company’s product, a licensee, or a business trying to capitalize on the larger brand.

The legal concern is that a larger junior user’s commercial strength may overwhelm the identity of the smaller senior user’s mark. Whether that has happened in the TradeSun litigation remains to be proven.

Federal registration can provide important procedural and substantive advantages, but it is not an automatic judgment against every later use of the same word. A defendant may dispute likelihood of confusion, the scope or strength of the rights, commercial relatedness, validity, defenses, or the requested remedy.

USPTO records also show that an April 2026 third-party cancellation proceeding against the ASTRA registration was terminated in July after the petitioner withdrew. That procedural termination is not a ruling on the merits and is not evidence that OpenAI infringed the mark.

Whatever happens in the lawsuit, the dispute illustrates an important startup lesson: trademark clearance is most useful before a company is committed to a name. For a technology company, a product name quickly becomes embedded in code, APIs, documentation, customer agreements, domains, app listings, advertising, and investor materials.

A conflict discovered before launch may require choosing a different name. The same conflict discovered after a major launch can carry far greater operational and commercial consequences. Meaningful clearance also looks beyond exact matches to similar marks and the goods or services they are used for—part of broader startup formation, IP ownership, and launch planning.

Businesses building a brand should keep reliable records showing when and how the mark was adopted and used. Depending on the business, these may include:

TradeSun is seeking restrictions on OpenAI’s challenged use of the Astra name and monetary remedies tied to the alleged infringement. Those are requests in a newly filed complaint. No court has ordered OpenAI to stop using Astra, found OpenAI liable, or awarded TradeSun damages or profits.

A trademark dispute is not automatically won by the company with the largest market presence, nor by the party holding a registration. A larger junior user can potentially create actionable reverse confusion, but infringement still requires a fact-specific likelihood-of-confusion analysis—and it has not been established in the TradeSun case.

Mahrouyan Law, P.C. provides trademark clearance and intellectual-property counsel to California startups and businesses, including federal applications, ownership, licensing, cease-and-desist issues, and selected IP disputes.