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A Timeline of Anthropic and OpenAI's Budding Rivalry - Business Insider
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Journalistic timeline piece useful for understanding the organizational history and interpersonal dynamics between Anthropic and OpenAI, relevant to governance and AI lab competition discussions, but paywalled and light on technical or policy depth.
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Importance: 28/100news articlenews
Summary
Business Insider traces the history of the rivalry between OpenAI and Anthropic, beginning with the founding dinner in 2015 through key milestones including Dario Amodei's departure from OpenAI and the two companies taking opposing stances on a Pentagon dispute. The piece contextualizes the personal and institutional tensions between Sam Altman and Dario Amodei as emblematic of broader AI industry divisions.
Key Points
- •OpenAI's origins trace to a 2015 dinner at Menlo Park's Rosewood Hotel involving Musk, Altman, Amodei, and others concerned about Google's AI dominance.
- •Dario Amodei initially declined to join OpenAI, later joined as 'Team Lead for AI Safety,' and eventually left to co-found Anthropic.
- •A viral moment of Altman and Amodei refusing to join hands symbolized the depth of their personal and professional rivalry.
- •Anthropic and OpenAI took opposing sides in a dispute with the Pentagon, reflecting divergent views on AI governance and deployment.
- •The rivalry is framed as representing an 'AI Cold War' between two dominant safety-focused and capabilities-focused paradigms.
Cited by 1 page
| Page | Type | Quality |
|---|---|---|
| Deep Learning Revolution Era | Historical | 44.0 |
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# From a tense split to a standoff with the Pentagon: A timeline of Anthropic and OpenAI's rivalry
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[Brent D. Griffiths](https://www.businessinsider.com/author/brent-d-griffiths)
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The feud between OpenAI Sam Altman and Anthropic CEO Dario Amodei started long before the viral photo of them refusing to join hands in unity.Ludovic MARIN / AFP via Getty Images
Mar 3, 2026, 5:11 AM ET
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- [Sam Altman](https://www.businessinsider.com/sam-altman) and Dario Amodei went viral for refusing to join together in a sign of unity.
- Once colleagues, the two AI CEOs have helped nurse their companies' rivalry.
- Here's how OpenAI and Anthropic finally reached this point.
If you want to know one of the biggest rivalries in AI, just ask for a show of hands.
Recently, OpenAI CEO Sam Altman and Anthropic CEO Dario Amodei provided an iconic image of their rivalry when they refused to join hands as the rest of the gathered for a moment of unity.
Weeks later, their differences were put into even sharper relief when Anthropic and OpenAI came down on opposite sides of a dispute with the Pentagon.
**Here's a timeline of how Altman and Amodei went from colleagues to becoming the face of AI's Cold War.**
## July 2015: Decisions happened over dinner
Elon Musk and Sam Altman are seen on stage together in 2015. While the pair later had their own falling-out, both were instrumental in the creation of OpenAI.Michael Kovac/Getty Images
In July 2015, Tesla CE
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