• Anthropic raised $3.5B in March 2025 at a $61.5B valuation.
  • By May 2026 it was valued at $965B with $47B in revenue.

The $3.5 Billion Round That Looked Big Until Everything That Came After

When Anthropic closed its $3.5 billion Series E in March 2025, the numbers were already difficult to contextualise. A $61.5 billion valuation for a company that was just four years old, with $1 billion in annual recurring revenue and a stated plan to burn $3 billion in the year ahead. Observers noted the ambition. Some questioned the burn rate. Nobody predicted what the next fourteen months would look like.

Anthropic hit $47 billion in annualised revenue by May 2026, up from $9 billion at the end of 2025. Its valuation reached $965 billion after a $65 billion Series H in May 2026 — the largest venture capital round in history — surpassing OpenAI to become the most valuable AI company in Silicon Valley. The company filed a confidential IPO prospectus on June 1, 2026.

From $1 billion ARR to $47 billion ARR in seventeen months. The Series E now looks like a footnote.

What the March 2025 Round Was Actually Funding

The $3.5 billion Lightspeed-led round arrived at a specific moment in Anthropic's development. Claude 3.7 Sonnet had just launched — a hybrid reasoning model designed to reduce the friction of navigating multiple model tiers. Revenue was at $1 billion ARR and climbing. Amazon had committed $4 billion. The stated goal was straightforward: expand compute capacity, deepen interpretability and alignment research, and accelerate international expansion.

What the press release did not capture was the product that would detonate the revenue curve. Claude Code had launched in February 2025 as a command-line coding assistant. By the time the Series E closed in March, it was already showing the kind of developer adoption that indicated something unusual was happening. It became generally available in May 2025.

Claude Code: The Product That Changed Everything

Claude Code launched in February 2025 and became the most-used AI coding tool within just eight months, overtaking both GitHub Copilot and Cursor. The adoption numbers are striking even by AI industry standards. Gradually AI

By September 2025, Claude Code was generating over $500 million in run-rate revenue, with usage growing more than 10x in just three months. By February 2026, run-rate revenue had grown to over $2.5 billion, having more than doubled since the start of the year. Business subscriptions quadrupled since early 2026. Enterprise use grew to represent over half of all Claude Code revenue, with customers including Netflix, Spotify, KPMG, L'Oréal, and Salesforce.

A recent analysis estimated that 4% of all GitHub public commits worldwide were being authored by Claude Code — double the percentage from just one month prior. For context: GitHub hosts over 420 million public repositories. Claude Code is now writing a meaningful fraction of the world's open-source software.

The Valuation March

The funding trajectory after the Series E reflects a company whose revenue was growing faster than any model could have projected.

By August 2025, just five months after the Series E, Anthropic's run-rate revenue had reached over $5 billion — making it one of the fastest-growing technology companies in history. In September 2025, Anthropic closed a $13 billion Series F at a $183 billion valuation, led by ICONIQ, co-led by Fidelity Management and Research Company and Lightspeed Venture Partners.

February 2026 brought a $30 billion Series G led by GIC and Coatue at a $380 billion post-money valuation. Three months later, the $65 billion Series H closed at $965 billion — almost exactly sixteen times the March 2025 Series E valuation, in fourteen months.

The Enterprise Dominance Story

The revenue numbers are remarkable. The enterprise story underneath them is more strategically significant.

Anthropic now serves over 300,000 business customers, with 100,000 of those running Claude on Amazon Bedrock. The number of customers spending over $100,000 annually has grown 7x in the past year. Over 1,000 customers now spend over $1 million annually — up from a dozen two years ago.

Approximately 70% of Fortune 100 companies use Claude. The largest enterprise deployment is Deloitte, with Claude deployed across 470,000+ employees.

In April 2026, Anthropic's enterprise AI market share reached 34.4%, surpassing OpenAI's 32.3% for the first time. The company that launched in 2021 as a safety-focused research lab alternative to OpenAI has become, by enterprise market share, the leading AI platform in the world.

The multi-cloud strategy is a material part of this. Claude remains the only frontier AI model available to customers on all three of the world's largest cloud platforms: Amazon Web Services (Bedrock), Google Cloud (Vertex AI), and Microsoft Azure (Foundry). Enterprise buyers who have already committed to one cloud provider do not need to change their infrastructure to adopt Claude — which removes a significant procurement barrier that competitors face.

What This Means for Indian and Emerging Market Developers

The original March 2025 article noted Anthropic's international expansion plans without specifying markets. The execution detail since then matters for Indian developers building on Claude.

The API pricing structure — Claude Sonnet at $3 per million input tokens, Opus at $5 per million — combined with the Amazon Bedrock availability means Indian startups using AWS infrastructure can access Claude without routing traffic internationally through a separate provider. The 300,000+ business customer base and the enterprise Partner Network launched in March 2026 suggest an expanding ecosystem of Claude-native tools and integrations that Indian developers can build on or build with.

The Department of Defense controversy — Anthropic was placed on the US DoD supply chain risk list in February 2026 after refusing to allow Claude to be used for mass surveillance and fully autonomous weaponry — is, paradoxically, a positive signal for international enterprise buyers who want an AI partner with clearly stated limits on military applications.

Bottom Line

Anthropic's valuation grew from approximately $61.5 billion in March 2025 to $965 billion by May 2026 — surpassing its main competitor OpenAI. The $3.5 billion Series E was not the story. It was the last moment before Claude Code, the Series F, the Series G, the Series H, and the confidential IPO filing turned Anthropic into the most valuable AI company in the world.

The bet on safety-first AI, founder-led culture, and technical depth in interpretability research has produced the fastest revenue growth arc in startup history. The IPO, expected as early as October 2026, will be the next chapter.

Edited by Nabarun