Business & Economics

Anthropic’s $65 B Series H Rockets Valuation to $965 B, Leapfrogging OpenAI

A lightning-quick Series H round closed on 28-29 May 2026 injected $65 billion into Anthropic and instantly crowned it the most valuable private AI firm at $965 billion, edging past OpenAI ahead of both companies’ anticipated IPOs.

By Underlines Team

Focusing Facts

  1. Round size: $65 billion (Series H) led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia; each anchor invested >$2 billion.
  2. Post-money valuation: $965 billion versus OpenAI’s $852 billion valuation from March 2026.
  3. Anthropic reported a $47 billion annualized revenue run rate in May 2026 and signaled its first operating profit for the June quarter.

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