What is Anthropic's new valuation in May 2026?

Anthropic closed a $65 billion Series H round on May 28, 2026, at a $965 billion post-money valuation. The round was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, with co-leads Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, and XN. This makes Anthropic the most valuable private AI company in the world, narrowly under the $1 trillion mark and ahead of OpenAI's $852 billion valuation from its March 2026 round.

How does Anthropic $965B compare to OpenAI $852B?

Anthropic's $965B post-money valuation in May 2026 surpasses OpenAI's $852B valuation from March 2026 by about $113B — roughly 13%. That gap reverses a long-standing dynamic where OpenAI was always the more highly valued of the two. The flip happened because Anthropic's enterprise revenue grew faster than OpenAI's in late 2025 and early 2026 (Claude Code adoption, Anthropic Services JV, enterprise contracts), and because Anthropic's research roadmap (Opus 4.8, Mythos preview) landed during the diligence window.

Who invested in Anthropic's Series H round?

The $65B Series H round was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. Co-leads included Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, and XN. The full investor list includes AMP PBC, Baillie Gifford, Blackstone, Brookfield, D.E. Shaw Ventures, DST Global, Fidelity, General Catalyst, Insight Partners, Jane Street, Lightspeed Venture Partners, MGX, NTTVC, NX1 Capital, Situational Awareness LP, and T. Rowe Price. Many investors are crossover funds positioning for an IPO.

Will Anthropic IPO in 2026?

Anthropic has not publicly confirmed an IPO timeline. Reporting from TechCrunch and the New York Times describes the Series H as 'likely the last private round before IPO,' with the IPO process potentially starting late 2026 or in 2027. OpenAI is reportedly preparing to file its confidential IPO prospectus in the coming weeks, targeting Q4 2026 (per CNBC, May 28, 2026). If both companies file in 2026, this will be the largest dual AI-IPO event in tech history.

Quick Answer

Anthropic $965B vs OpenAI $852B: Which AI Giant Wins the Valuation Race? (June 2026)

Published: June 1, 2026

Anthropic $965B vs OpenAI $852B: Which AI Giant Wins the Valuation Race? (June 2026)

On May 28, 2026, Anthropic closed a $65 billion Series H round at a $965 billion post-money valuation — leapfrogging OpenAI’s $852 billion valuation from its March 2026 round. Bloomberg’s headline: “Anthropic Eclipses OpenAI With Valuation of $965 Billion.” The New York Times: “Anthropic Tops OpenAI to Become the World’s Most Valuable A.I. Start-Up.”

For the first time, the smaller AI lab is worth more than the giant that started the boom. Here’s what actually happened and what comes next.

Last verified: June 1, 2026.

TL;DR

	Anthropic (May 2026)	OpenAI (March 2026)
Valuation	$965B post-money	$852B post-money
Latest round	Series H, $65B raised	March 2026 secondary, $122B raised
Lead investors (latest)	Altimeter, Dragoneer, Greenoaks, Sequoia	(Multi-investor secondary)
Flagship model (June 2026)	Claude Opus 4.8 (May 28)	GPT-5.5 (April 23)
Coding agent	Claude Code (dynamic workflows)	Codex Cloud + CLI
IPO status	”Likely last private round” per reports	Confidentially filing imminently (per CNBC)
Enterprise pitch	Audit-friendly, agentic-coding-first	Multi-product ecosystem, ChatGPT distribution

The Series H, in numbers

From Anthropic’s announcement and TechCrunch/Bloomberg reporting on May 28–29, 2026:

$65 billion new capital raised
$965 billion post-money valuation (implies ~$900B pre-money)
Led by Altimeter Capital, Dragoneer, Greenoaks, Sequoia Capital
Co-led by Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, XN
Plus AMP PBC, Baillie Gifford, Blackstone, Brookfield, D.E. Shaw Ventures, DST Global, Fidelity, General Catalyst, Insight Partners, Jane Street, Lightspeed Venture Partners, MGX, NTTVC, NX1 Capital, Situational Awareness LP, T. Rowe Price

That investor list is unusually long because it includes many crossover funds (Fidelity, T. Rowe Price, Capital Group, Baillie Gifford) — the same firms that buy at IPO. Crossover participation is the strongest possible signal that an IPO is on the runway.

For comparison, OpenAI’s last round (March 2026) brought in $122 billion in a secondary at $730 billion, which has since been re-marked higher to $852 billion based on subsequent paper transactions.

Why Anthropic overtook OpenAI

It wasn’t one thing. It was a stack of compounding wins through late 2025 and into early 2026:

1. Claude Code became the default for serious AI coding. By May 2026, Claude Code’s subagent system, Agent View, and dynamic workflows (capped at 1,000 subagents per session) made it the agent of choice for codebase-scale work. Cursor 3 Agents and Zed Terminal Threads both routed to Claude under the hood for hard tasks.

2. Anthropic Services JV with Bain (April 2026) gave Anthropic a direct enterprise consulting channel — competing with OpenAI’s deployment partners on professional services instead of API revenue alone.

3. Mythos preview (Anthropic’s cybersecurity model, restricted access via Project Glasswing) demonstrated a different research roadmap than OpenAI’s product-led approach. It found 23,000+ vulnerabilities across 1,000+ OSS projects in preview. That story is catnip for governments and defense buyers.

4. Honesty and alignment positioning. Opus 4.8’s headline upgrade (May 28, 2026) was not just better SWE-bench (88.6% Verified) — it was substantially lower misaligned behavior versus Opus 4.7 on internal evals. For risk-aware enterprise buyers, that’s a buying signal.

5. Ad-free strategy. Anthropic publicly committed (May 27, 2026) to never inject ads into Claude, in direct contrast to OpenAI’s experiments with ChatGPT ads. Enterprise CIOs treat that as a data-control promise.

What OpenAI still has

The valuation gap is real but small (~13%). OpenAI still has structural advantages Anthropic hasn’t matched:

ChatGPT consumer distribution. ChatGPT remains the #1 consumer AI product by a large margin. That’s a moat for funding, talent, and brand.
Multi-product ecosystem. Sora (image/video, despite the brand reshuffle around Sora’s app), Codex Cloud, ChatGPT Atlas browser, Workspace Agents, search products. OpenAI is a portfolio company. Anthropic is closer to a research-and-coding-agent company.
Imminent IPO filing. CNBC reported May 28, 2026 that OpenAI is preparing to file its confidential IPO prospectus “in the coming days or weeks.” That filing could re-mark the valuation upward on day one of trading.
Microsoft distribution. Azure OpenAI Service is still the default for Microsoft enterprise customers. Microsoft 365 Copilot, Foundry, and Windows Agent Runtime all default to OpenAI models for many workloads.

What’s coming next (June–Q4 2026)

For Anthropic:

Mythos wide release — Anthropic has said “in weeks.” Likely June or July 2026.
Continued Claude Code feature shipping — dynamic workflows currently in research preview, broader rollout expected.
First quiet preparation for IPO — picking bankers, building investor relations, hiring CFO-track talent. The Series H is widely seen as the staging round.

For OpenAI:

GPT-5.6 — Polymarket prices 80–89% probability of release by June 30, 2026.
Confidential IPO prospectus filing — imminent per CNBC.
GPT-6 rumored late 2026 — persistent memory and agentic capabilities as headline features.

For both:

The IPO question is no longer “if” — it’s “which one prices first, and at what multiple of the last private round.” Public markets will set the real number.

Should this change your AI stack?

For most builders: no, not immediately. Valuations don’t change which model is best for your workload. SWE-bench scores, latency, pricing, and your team’s existing integrations matter far more than founder-friendly term sheets.

But it does change a few decisions on the margins:

Enterprise procurement: Anthropic’s IPO-ready posture and ad-free commitment make it easier to sell internally at risk-averse companies.
Long-horizon contracts: Both companies are now too big to fail short-term. A 3-year contract with either is safer than it was in 2023.
Talent and ecosystem: Anthropic’s valuation jump will accelerate talent acquisition and partner deals. Expect more integrations, more deployed products, more services partners.

Sources

Bottom line

For the first time, Anthropic is worth more than OpenAI on paper. Public markets will get the final word — both companies are racing toward IPO, and the first one to price will reset the comp set for the entire AI industry. But the read-through for builders is unchanged: pick the model that wins your benchmark, not the cap table.