Artificial intelligence giant Anthropic sued a major paying customer for trademark infringement over a similar logo.

Artificial intelligence giant Anthropic sued a major paying customer for trademark infringement over a similar logo.

Anthropic demanded in a July 1 lawsuit that Abnormal remove the parallel slash from its logo, so consumers do not confuse it for Anthropic’s logo, Axios reported. All Abnormal employees use Anthropic’s Claude, and Evan Reiser, the AI security platform’s CEO, projected it will spend $10 million on Anthropic this year, according to an Abnormal blog post.

“This additional element in the Infringing Logo is not merely an insignificant alteration; it is the defining feature that creates confusing similarity with Anthropic’s Anthropic Marks, and its introduction fundamentally changes the commercial impression of the mark,” the lawsuit said.

Anthropic, Denise Howell, Anthropic’s outside legal counsel Morrison & Foerster, Reiser and Abnormal AI each did not immediately respond to the Daily Caller News Foundation’s requests for comment.

“Abnormal was built by inventing, not copying … he accusation that we copied another company to deceive customers is so personally offensive. It is the opposite of who we are,” Reiser said in the blog post.

“I have been a major Anthropic user and advocate. My personal Anthropic account will spend ~$1M this year (Abnormal will be >$10M),” Reiser added.

The AI security firm was a paying customer since at least January 2025, so “Abnormal adopted the Infringing Marks with actual knowledge of Anthropic’s prior rights,” according to the lawsuit.

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“On August 18, 2025, Anthropic … contacted Abnormal, noting that the parties’ logos were ‘quite similar’ and requesting that Abnormal change the stylization of its mark,” the lawsuit stated. “Abnormal’s Legal Director responded that Abnormal believed the logos were distinct and that the companies operated in ‘different markets.'”

The suit aims to safeguard Anthropic’s trademarks, not harm Abnormal’s business, the company told Axios.

“Trademark law is all about preventing confusion, and the chances of confusion seem pretty high here,” 💻Technology lawyer Denise Howell told the outlet. “Anthropic’s case looks pretty strong based on the similarity of the logo and the fact they’re in the same field.”

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