Days after Anthropic AI filed a lawsuit against Abnormal AI, a cybersecurity firm, over trademark infringement of its “A/” slash logo design, the latter’s CEO Evan Reiser termed the allegations baseless and said that Anthropic cannot claim “monopoly over every AI-adjacent A/ design.”
On July 1, Anthropic AI filed a lawsuit at US District Court in Northern District of California against Abnormal AI over alleged “trademark infringement, unfair competition and false designation of origins”, claiming that the latter’s logo of A/ is similar to Anthropic’s.
Taking to X, Evan Reiser, CEO of Abnormal AI, a company founded in 2018, claimed that Anthropic in its lawsuit has demanded “all revenues, earnings and profits” of his company over concerns that they copied Anthropic’s brand to mislead security customers.
.@AnthropicAI has filed a lawsuit against @Abnormal
claiming we copied their brand to mislead security customers, and they are asking for “all revenues, earnings and profits”This is obviously not true. They don’t own every A/slash design in AI cybersecurity, and they don’t get… pic.twitter.com/TAy9gRCmqM
— Evan Reiser (@evanreiser) July 7, 2026
“They do NOT own the trademark: They argue our “/\\” logo is confusingly similar to their “A\” yet they don’t have a registered trademark that gives them a monopoly over every AI -adjacent A/ design in cybersecurity… and they don’t get to turn a logo dispute into a claim on Abnormal’s entire business,” said Reiser.
Reiser maintained that despite Abnormal AI being a “large customer” of Anthropic, the company did not inform him of the lawsuit and that he came to know about it through a reporter, and not his “partner.” He revealed that Abnormal AI has a contract of over $10M with Anthropic and it has installed Claude for its 100% employees.
In a detailed response published on their website, Abnormal AI CEO claimed that his company was founded in 2018, three years prior to Anthropic AI’s foundation. Reiser also expressed shock at the lawsuit claiming “it didn’t feel Anthropic.”
“Their demands are shocking: The lawsuit asks for “disgorgement of all revenues, earnings, profits, compensation, and benefits. This doesn’t feel Anthropic: We’re both supposed to be mission-oriented companies to act for the global good,” said Reiser.
What is the Anthropic-Abnormal AI Trademark Controversy?
Anthropic PBC is an AI startup co-founded by Dario Amodei, Daniela Amodei and five other former employees at OpenAI in 2021 while Abnormal AI is a AI-led cybersecurity company founded in 2018.
Amid the controversy, Abnormal AI acknowledged that Claude and other similar technologies may be used for its internal purposes, but insists none of them include the use of any systems involved in threat detection and management.
“They say we deceived customers: No customer has ever purchased thinking we were Anthropic. Our business is about trust: we help our customers stop deception crimes (phishing, fraud, social engineering),” claimed Reiser.
Multiple social media posts by Abnormal AI has shown a pattern of the company’s logo evolving over the years. For example, in 2020, Abnormal AI rebranded itself as ‘/\bnormal AI’ changing the letter ‘A’ to ‘/\’. Reiser claims that his company hired a designer to work on the current short logo of /\\.
“We hired ALINE in April 2021 to design our slash-based Abnormal brand identity, just months after Anthropic was founded and before Claude existed. The logo on our website today is the same wordmark, pixel-for-pixel, that we have used for ~5 years,” said Reiser.
Also Read: With Anthropic, AI Companies are Finally Realizing How It Feels to be Scraped
