The leaders of the two most powerful AI companies in the world are locked in a bitter personal and professional rivalry that is influencing how artificial intelligence develops globally. Keach Hagey reports for The Wall Street Journal that the conflict between OpenAI CEO Sam Altman and Anthropic CEO Dario Amodei stretches back nearly a decade and has recently spilled into public view.
The feud became visible in early 2026 when Anthropic sued the Trump administration after being barred from doing business with the Pentagon. Altman responded by announcing that OpenAI had secured a classified contract with the Defense Department. Amodei then wrote a Slack post calling OpenAI “mendacious” and accusing Altman of a pattern of dishonest behavior.
The roots of the conflict go back to 2016, when Dario Amodei and OpenAI co-founder Greg Brockman lived in the same San Francisco social circle. Dario, then a researcher at Google, joined OpenAI in mid-2016. His sister Daniela also joined the company, recruited by Brockman. From the beginning, philosophical and personal differences created friction. Brockman believed AI breakthroughs should be communicated broadly to the public. Dario argued sensitive developments should be reported to governments first.
Internal tensions escalated over the years. Dario clashed repeatedly with both Brockman and Altman over credit, power, and research direction. He led the teams behind GPT-2 and GPT-3 but felt his contributions were consistently underplayed. A 2018 incident in which Brockman and Altman met former President Barack Obama without informing Dario deepened his resentment. In 2020, a confrontation in a conference room ended with Dario and Daniela shouting at Altman after he allegedly accused them of lobbying against him and then denied having said so.
Peer reviews written that same year added further damage. Brockman submitted harsh feedback about Daniela accusing her of abusing her position. Altman called it “tough but fair.” Daniela rebutted it at length.
By late 2020, Dario, Daniela, and roughly a dozen colleagues left OpenAI to found Anthropic. Before leaving, Dario wrote an internal memo arguing that the ideal AI company should operate 75 percent in the public interest and only 25 percent as a commercial enterprise. He positioned Anthropic as that alternative.
Today, Anthropic uses this framing as a brand strategy. An ad that aired during the 2026 Super Bowl implicitly criticized OpenAI for introducing advertising into its chatbot. Internally, the approach is described as casting Anthropic as the “healthy alternative.” Amodei has privately compared OpenAI and other rivals to tobacco companies knowingly selling a harmful product.
The rivalry between their leaders is no longer just corporate. At a tech summit in New Delhi in February 2026, Altman and Amodei refused to join hands during a group photo with Indian Prime Minister Narendra Modi, opting instead to touch elbows.
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