Anthropic's $65B Series H at $965B valuation overtakes OpenAI as most valuable AI startup

Anthropic's valuation more than doubled in three months — from $380B at its February Series G to $965B — in a $65B raise that reframes the AI funding race as a battle for compute. Altimeter Capital led what was described as its largest-ever investment, alongside Dragoneer, Greenoaks, and Sequoia, with Coatue and ICONIQ as co-leads. The round folds in $15B of previously committed hyperscaler capital, including $5B from Amazon as part of a broader up-to-$25B and $100B cloud-commitment narrative.

The most telling detail is who else wrote checks: memory and storage makers Micron Technology, Samsung, and SK Hynix joined the round. These aren't typical AI investors — they manufacture the hardware AI data centers run on, signaling that securing physical supply (HBM, DRAM, fabs) is now inseparable from frontier-model strategy. Anthropic's run-rate revenue reportedly crossed $47B, up sharply on the strength of enterprise Claude and Claude Code adoption.

The valuation eclipses OpenAI, last marked at $852B post-money in March 2026, making Anthropic the most valuable AI startup in the world by private mark. That ordering would have seemed implausible a year ago and underscores how quickly capital is concentrating around the two leading labs.

Community reaction split sharply. On Latent Space and HN, bulls cited Altimeter's conviction and Claude's role as enterprise infrastructure; bears called it "near-trillion for a company whose main product is a chatbot." Many explicitly tied the raise to agent-workload capacity — Anthropic's thousand-agent "Dynamic Workflows" feature is expected to spike inference costs, making the capital a hedge on compute. The pairing with a confidential IPO filing days later only sharpened the scrutiny.