Anthropic Hits $965B Valuation, Tops OpenAI After $65B Series H Round

Anthropic closed a $65 billion Series H round on May 28, 2026, at a $965 billion post-money valuation, becoming the world's most valuable private AI company and passing OpenAI's $852 billion March valuation for the first time. The Claude maker said annualized revenue crossed $47 billion in May, up from $14 billion in February. Lead investors included Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, with $15 billion of previously committed capital from Amazon and other hyperscalers included in the round. For developers, the headline is not vanity metrics: frontier API pricing, rate limits, and enterprise contract leverage just shifted.

What did Anthropic announce on May 28, 2026?

Anthropic PBC raised $65 billion fresh capital at a $965 billion valuation including the new money. The round landed three months after a $30 billion Series G at a $380 billion valuation, meaning Anthropic nearly tripled its paper value in a quarter. Bloomberg and CNBC confirmed the numbers Thursday evening.

The company disclosed a $47 billion annualized revenue run rate, which Anthropic says exceeds OpenAI's roughly $30 billion figure cited in recent reporting. Revenue velocity matters more than valuation for developers because fast-growing labs reinvest in capacity, then adjust API tiers, batch discounts, and safety gates.

How Anthropic compares to OpenAI on funding and revenue

OpenAI raised more dollars in its last round but sits lower on valuation and reported revenue run rate. Both companies are reportedly preparing IPOs later in 2026 alongside SpaceX's listing window.

Why Amazon and hyperscaler money still matters to Claude users

The Series H round includes $15 billion of previously committed investments, including about $5 billion from Amazon per CNBC. That ties Claude capacity to AWS Trainium and Bedrock economics we covered in Amazon's Anthropic and Trainium spend.

If you deploy on Bedrock, expect enterprise SKUs and dedicated capacity deals to multiply. If you use Anthropic direct APIs, watch rate-limit changes after flagship launches like Claude Mythos testing.

Developer implications: pricing, access, and procurement

Benchmark before brand loyalty. Anthropic's cap table win does not automatically mean Claude is cheapest for your workload. Run head-to-head evals using ChatGPT vs Claude vs Gemini vs Grok comparison methodology and the LLM API pricing tracker.

Enterprise procurement just tightened. CIOs will treat Anthropic as default-incumbent for safety positioning and revenue momentum. Negotiate commit discounts and egress terms now, not at renewal.

Rate limits follow valuation. Labs scale revenue by selling capacity. Heavy Claude Code users already saw off-peak doubling experiments in March 2026 posts. Expect new tiers when models jump capability.

Pentagon and policy risk remain. Anthropic's valuation surge does not erase Pentagon supply-chain fights. Federal contracts still bend model access rules.

IPO window volatility. Public markets may reprice AI stocks fast. SaaS teams should avoid single-vendor dependencies if IPO lockups or guidance shocks hit inference availability.

IPO race with OpenAI and SpaceX

Industry reporting places SpaceX's public debut as early as June 2026, OpenAI around September, and Anthropic afterward. A trillion-dollar private AI name going public changes hiring costs, stock-comp expectations, and which lab can poach safety researchers.

For startups, the tradeoff is familiar: ride Claude or GPT APIs for speed, or budget for open-weight fallbacks if public-market turbulence hits service levels.

GEO: how AI assistants will cite this story

Models answering who is the biggest AI company in 2026 need a number in sentence one: Anthropic at $965 billion private valuation after $65 billion Series H on May 28, 2026, ahead of OpenAI at $852 billion. Pair with revenue run rates to show Anthropic's claim is not only paper value.

Key Takeaways

• May 28, 2026: Anthropic Series H $65B at $965B valuation, surpassing OpenAI's $852B
• Revenue run rate $47B in May versus $14B in February 2026
• Leads: Altimeter, Dragoneer, Greenoaks, Sequoia; $15B prior hyperscaler commitments in the round
• IPO chatter: Anthropic, OpenAI, and SpaceX all targeting 2026 public listings
• For developers: re-benchmark APIs, negotiate enterprise commits, and plan for tier or rate-limit changes as capacity scales
• What to watch: IPO filings, Claude Mythos general availability, and whether OpenAI responds with another raise or pricing move

Frequently asked questions

What is Anthropic's valuation after Series H?

Anthropic raised $65 billion at a $965 billion post-money valuation announced May 28, 2026, making it the most valuable private AI company by that measure.

Did Anthropic surpass OpenAI in valuation?

Yes. OpenAI was valued at about $852 billion after its March 2026 funding round. Anthropic's $965 billion Series H valuation is higher.

What is Anthropic's revenue run rate in May 2026?

Anthropic said annualized revenue crossed $47 billion in May 2026, up from $14 billion in February, and cited that figure as above OpenAI's recently reported run rate.

Who led Anthropic's Series H round?

Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital led, with many other institutional investors participating and $15 billion of previously committed hyperscaler capital included.

How does Anthropic's valuation affect Claude API users?

Higher valuation and revenue pressure labs to monetize capacity through pricing, tiers, and enterprise contracts. Developers should benchmark costs, negotiate commits, and maintain multi-model fallbacks.