From a tense split to dueling IPOs: A timeline of Anthropic and OpenAI's rivalry

Business Insider•Mon, Jun 22, 2026, 09:56 AM•2 min read

Ever since Anthropic CEO Dario Amodei left OpenAI in December 2020, the two startups have found themselves at loggerheads.

Source: [Business Insider](https://www.businessinsider.com/sam-altman-dario-amodei-anthropic-openai-rivalry-timeline-2026-2)

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