---
id: "2026-05-28-anthropic-series-h-965b"
url: "https://postcutoff.com/e/2026-05-28-anthropic-series-h-965b/"
as_of: "2026-11-13T13:49:00+01:00"
date: "2026-05-28"
date_precision: day
category: business
importance: 4
confidence: high
status: [Confirmed]
sources: 3
editor: human editor
human_review: null
version: "2026-10-04"
---

As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/e/2026-05-28-anthropic-series-h-965b/

# Anthropic raises $65B Series H at $965B valuation, passing OpenAI

On May 28, 2026 Anthropic closed a $65 billion Series H at a $965 billion post-money valuation, above OpenAI's reported $852B. It said run-rate revenue had passed $47 billion. It confidentially filed for an IPO four days later.

## Key facts
- $65B Series H at $965B post-money (May 28, 2026)
- Co-led by Altimeter, Dragoneer, Greenoaks, Sequoia, Capital Group, Coatue, D1 and others
- Run-rate revenue crossed $47B in May 2026 (per coverage of the announcement)
- Valuation rose from $380B (Feb) to $965B in about three months

## What happened

Anthropic announced the Series H on the same day as Claude Opus 4.8. Coverage described it as likely the company's last private raise before an IPO.

## Why it matters

By private valuation, Anthropic became the most valuable AI lab.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 28 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): in its training data
- Gemini 4 Hydrogen (training cutoff March 2026): 58 days after its cutoff
- Grok 4.7 (training cutoff May 2026): in its training data

## Sources

1. [Anthropic raises $65B in Series H at $965B post-money](https://www.anthropic.com/news/series-h) (anthropic.com, official)
2. [TechCrunch: Anthropic raises $65B, nears $1T valuation ahead of IPO](https://techcrunch.com/2026/05/28/anthropic-raises-65-billion-nears-1t-valuation-ahead-of-ipo/) (techcrunch.com, press)
3. [Forbes: Anthropic's $900B round set to surpass OpenAI](https://www.forbes.com/sites/jonmarkman/2026/05/04/anthropics-900b-funding-round-set-to-surpass-openai/) (forbes.com, press)

## Changes

- 2026-09-29 (filed): Created

## Related

- 2026-06-01: [Anthropic confidentially submits draft S-1 for an IPO](https://postcutoff.com/e/2026-06-01-anthropic-confidential-s1-ipo/index.md)
- 2026-02-12: [Anthropic raises $30B Series G at $380B valuation](https://postcutoff.com/e/2026-02-12-anthropic-series-g-380b/index.md)