Anthropic has acquired Coefficient Bio, a stealth biotech startup, in an all-stock deal valued at over $400 million, according to The Information and TechCrunch [1]. The acquisition closed in early April 2026 and represents one of the highest per-employee valuations in technology history: Coefficient Bio has fewer than 10 people [2].

Coefficient Bio was founded last fall and backed by Dimension, a venture capital firm [3]. The startup focused on developing AI models for biological research -- protein folding, drug discovery, and computational biology -- areas where Anthropic's Claude models have shown capability but lack domain-specific training data [4].

The deal signals Anthropic's intent to compete directly in the AI-for-biology space, where DeepMind's AlphaFold has dominated for years. By acquiring a team already working on biological AI models, Anthropic gains specialized expertise without building from scratch [5]. The all-stock structure means Coefficient Bio's founders and employees will hold equity in Anthropic rather than receiving cash [6]. Anthropic has not commented on the deal. The startup's website remains dark.

-- DAVID CHEN, Beijing