Anthropic’s Amodei siblings may hold the key to generative AI

SAN FRANCISCO — Daniela Amodei has an energy that’s hard to place — warm, unhurried, immediately present. She swept into a sunlit room on the ground floor of Anthropic‘s headquarters in December, sat down, and immediately apologized for her mug.

“Is my, like, gigantic novelty mug going to be distracting if I have it?” she said. “I’ll defer to the wise camera people in terms of what’s in the shot.”

It was a disarming kind of normal for someone operating at this level.

Five years ago, she and her brother, Anthropic CEO Dario Amodei, led an exodus from OpenAI.

They took a core group of senior researchers and started Anthropic with a contrarian bet: That safety and business success weren’t in tension, that the real money wasn’t in viral consumer products, and that the artificial intelligence race would be won by the company that knew when to slow down.

“We really just felt more like we were running towards something than running away from something,” Daniela said of the decision to leave.

The co-founders had known each other for years before OpenAI. Her brother and co-founders Tom Brown and Chris Olah worked together at Google Brain. Others overlapped at various labs.

Anthropic’s headquarters is on “AI Alley” in San Francisco, a 230,000-square-foot glass high-rise in the shadow of Salesforce Tower. The neighborhood is a corridor of startups and tech giants reshaping the American economy from a handful of downtown blocks.

Anthropic is now valued at $183 billion and on track to nearly double that, according to a newly signed term sheet, with Microsoft and Nvidia joining its cap table.

Revenue has grown ten times annually for three consecutive years, thanks in large part to the fact that the company’s AI assistant, Claude, has become the model of choice for enterprises that care about reliability as much as capability.

Daniela Amodei mentioned, almost in passing, that Claude once helped diagnose her with a bacterial infection after multiple doctors missed it.

With her human-scale, here-and-now energy, she is by most counts the opposite of the AI founder archetype personified by OpenAI’s Sam Altman and Tesla/xAI CEO Elon Musk.

Even her brother is a version of the technical visionary who speaks in timelines to superintelligence and treats interviews like TED talks.

But Daniela Amodei is different.

If her brother is the one looking for a path to the horizon, she is pouring the foundation that lets him get there.

Google scrambled. Microsoft went all in. The entire tech industry lurched into motion.

But Anthropic didn’t sprint.

From the start, Anthropic was defined by a contrarian posture toward OpenAI: move slower, ship later, and optimize for trust.

While ChatGPT became a flashy consumer toy, the Amodeis made a different bet. They believed that the real money wasn’t in…