Anthropic Eyes $900B Valuation, Overtaking OpenAI the Same Week It Filed for IPO

📖 5 min read

Anthropic is closing a funding round of more than $30 billion at a valuation above $900 billion – and the timing is pointed. The deal is expected to wrap as early as this week, the same week rival OpenAI quietly filed its IPO prospectus with the SEC. If it closes at the reported figure, Anthropic will become the world’s most valuable private AI company, leapfrogging OpenAI in a single transaction.

That is a remarkable sentence to write. Less than 3 months ago, Anthropic closed its Series G at a $380 billion post-money valuation. A $900 billion pre-money valuation would represent a 2.4x jump in under 90 days. For context, that is faster valuation growth than any tech company in recent memory – faster than Nvidia’s run-up, faster than Meta’s AI-driven recovery, faster than anything normal market math would suggest.

The Numbers Behind the Hype

Before calling this pure froth, look at the revenue trajectory. Sacra estimates Anthropic hit $43 billion in annualized revenue in April 2026 – up from $9 billion at the end of 2025. That is nearly a 5x increase in four months. For reference, OpenAI hit roughly $3.7 billion in annualized revenue in 2024. Even accounting for different accounting methods (Anthropic counts gross reseller spend, which inflates top-line relative to net-reporting peers), the growth rate is legitimately extraordinary.

Metric	Anthropic (May 2026)	OpenAI (est. 2026)
Reported valuation	$900B+ (pre-money)	~$300B (last private round)
Annualized revenue	$43B (April 2026)	~$10-12B (est.)
Revenue growth (YoY)	~5x in 4 months	~3x in 2025
$1M+ annual customers	1,000+	Not disclosed
Fortune 10 customers	8 of 10	Not disclosed
Claude Code revenue (ARR)	$2.5B (Feb 2026)	N/A

The enterprise penetration numbers are striking. Eight of the Fortune 10 are now Claude customers. More than 1,000 companies are spending over $1 million annually on Anthropic’s API – a figure that doubled from 500 to 1,000 in under two months as of April 2026. Those are not demo accounts or trial credits; those are real procurement budgets.

Who Is Writing the Checks

Sequoia Capital, Dragoneer Investment Group, Altimeter Capital, and Greenoaks Capital Partners are each expected to contribute roughly $2 billion as co-leads in the new round, according to Bloomberg. Existing investor Founders Fund – Peter Thiel’s firm – is also participating. This is not a dilution panic round; major institutional names are adding exposure at a price 2.4x higher than where they last invested.

That signals these investors believe Anthropic’s revenue trajectory justifies the valuation math. At $900B and $43B in ARR, the implied revenue multiple is roughly 21x. That sounds high in traditional software terms – but for a company growing 5x in 4 months with enterprise lock-in across the Fortune 10, growth investors will argue it is defensible.

The OpenAI Timing Is Not Coincidental

On Friday, May 22, OpenAI filed its IPO prospectus confidentially with the SEC. Goldman Sachs and Morgan Stanley are leading the offering, with a public listing targeting as early as September 2026. The confidential filing means we do not yet know OpenAI’s claimed revenue or the IPO price target – but the move signals OpenAI is moving toward liquidity for early investors and employees.

Anthropic’s timing flips the narrative. Rather than OpenAI’s IPO dominating the AI investment conversation this week, the story becomes: the company that was supposed to be OpenAI’s smaller safety-focused rival is now worth more, growing faster, and still taking private capital at a premium. Dario Amodei, Anthropic’s CEO, does not need to IPO to create liquidity – he can simply raise another round that marks up every prior investor.

What Is Driving Anthropic’s Revenue Explosion

Three products explain most of the growth:

Claude API enterprise adoption. The 300,000+ business customers using Claude – 100,000+ of which run on Amazon Bedrock – generate pay-per-token revenue that scales linearly with usage. As more Fortune 500 companies embed Claude into internal tools, that baseline compounds automatically.

Claude Code. Launched as a standalone product in February 2025, Claude Code hit $1 billion in annualized revenue by November 2025 and $2.5 billion by February 2026. Enterprise customers including Netflix, Spotify, KPMG, L’Oreal, and Salesforce account for over half of Claude Code revenue. Developer tooling that embeds itself into professional workflows is notoriously sticky – churn rates are minimal because switching costs are high.

PwC deployment. Earlier in May, Anthropic announced PwC is deploying Claude to build technology, execute deals, and reinvent enterprise functions for clients globally. A Big Four consulting firm standardizing on one AI provider creates a multiplier effect: every client engagement PwC runs through Claude adds to Anthropic’s revenue and brand credibility.

Honest Caveats

The $900 billion figure deserves scrutiny. Anthropic reports revenue on a gross basis – counting total end-customer spend through cloud resellers like AWS, Google, and Microsoft as revenue, then booking partner payouts as expenses. This inflates top-line numbers relative to companies reporting net revenue. The real margin picture is murkier than the headline ARR implies.

The valuation also reflects intense competition risk. OpenAI, Google DeepMind, Meta, Mistral, and a wave of open-source models are all competing for the same enterprise budgets. Anthropic’s safety-focused positioning has been a differentiator, but it is not a permanent moat. If Claude 4 or Claude 5 fails to hold its benchmark lead, enterprise switching costs are lower than they appear.

Finally, a $900B valuation for a private company still means illiquid equity for most investors. Until Anthropic IPOs or gets acquired, that number is a negotiated fiction – a real but unexitable price. The actual test comes when public markets set the clearing price.

What to Watch Next

The round is expected to close in the week of May 26, 2026. Watch for the official press release – it will likely include revenue milestones and investor quotes designed to set the stage for a future IPO. Also watch OpenAI’s public IPO filing, expected to include disclosed financials for the first time. When both sets of numbers are public simultaneously, the AI valuation debate will get much more interesting.

BetOnAI Verdict

The $900 billion number is eye-catching but it is not baseless. Revenue growing 5x in 4 months with Fortune 10 penetration and sticky developer tooling revenue justifies a premium multiple – the question is how premium. At 21x ARR, investors are pricing in continued hypergrowth with minimal competitive disruption. That is a high bar.

For enterprises currently evaluating AI vendors: this funding round does not change which model performs best on your specific use case. Run your own benchmarks. But it does confirm Anthropic is not going anywhere – the balance sheet now has enough runway to sustain aggressive R&D spending for years. That reduces vendor risk.

For OpenAI: filing for IPO the same week a competitor leapfrogs your private valuation is awkward. The public markets will now compare both companies directly – and Anthropic’s revenue growth rate will be part of that conversation.

The AI industry in mid-2026 is not slowing down. It is accelerating, and the money is following the velocity.

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Sources:

• Bloomberg – Anthropic to Close Over $30 Billion Round (May 22, 2026)
• TechTimes – Anthropic Funding Round to Top $30B (May 23, 2026)
• IBTimes – Anthropic Set To Raise $30 Billion (May 22, 2026)
• Sacra – Anthropic Revenue, Valuation & Funding
• Yahoo Finance – Wall Street and the OpenAI/Anthropic IPO Race (May 2026)