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Jarred Sumner founded Bun, the open-source JavaScript runtime and toolkit acquired by Anthropic.

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Jarred Sumner founded Bun, the open-source JavaScript runtime and toolkit acquired by Anthropic.

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Founder at Bun from 2021 to PresentFounded Bun, the open-source JavaScript runtime and toolkit. Bun was acquired by Anthropic in December 2025; its team continues developing Bun.

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