Anthropic’s slowing growth raises questions for the AI investment trade

Anthropic, the company behind the Claude models, is growing at a pace most companies only see in pitch decks. Even so, its growth is reportedly slowing, and investors are treating that as a potential warning sign for the wider AI market.

Anthropic is reportedly preparing for an IPO, with attention focused on a listing expected in November 2026. The valuation target is said to be close to $2 trillion.

The numbers behind the worry

According to leaked financial documents, Anthropic brought in nearly $4.6 billion in revenue for full-year 2025. That was a twelvefold jump from the prior year.

The momentum carried into 2026. Quarterly revenue was reported at around $4.7 billion in Q1, then roughly $11.5 billion to $11.6 billion in Q2. Q3 came in at $16.8 billion.

Revenue more than doubled from Q1 to Q2. The Q3 gain, by contrast, was approximately 45% sequentially. Analysts flagged concerns about slowing month-over-month growth even as the absolute numbers kept climbing.

Annualized revenue reportedly reached approximately $65 billion by July 2026, up from roughly $9 billion earlier that year.

The cost side of the ledger

The same leaked documents point to operating losses of more than $8 billion in 2025, with Anthropic’s total net loss for 2025 at approximately $42 billion. Compute and infrastructure spending for the year was put at $7.33 billion.

Anthropic’s non-cancellable compute commitments are reported at around $518 billion over the next decade. Amazon accounts for a reported $110 billion to $111 billion. Google accounts for $111 billion, and Microsoft is also among the major partners.

Customer concentration is another pressure point. Two clients reportedly made up about 25% of Anthropic’s 2025 revenue.

A CEO who wants to slow down

In September 2026, CEO Dario Amodei called for a coordinated approach across the industry to slow the pace of AI capability advancements. His argument centered on safety and alignment. The call came amid broader concerns about whether such rapid growth can be sustained and what that means for the infrastructure already being built to support it.

Wall Street is still leaning bullish

In October 2026, Anthropic’s pre-IPO investor briefings reportedly showcased strong quarterly results and adjusted profitability. Wall Street analysts have reportedly kept a positive outlook on the company’s spending dynamics.

What this means for the AI trade

Anthropic’s IPO is shaping up to be a referendum on the economics of frontier AI. The compute commitments deserve particular attention. Amazon, Google and Microsoft are not just partners, they are counterparties to a combined obligation that runs into the hundreds of billions.

Several markers are worth tracking from here. The first is whether Q4 growth holds near the Q3 pace or continues to decelerate. The second is whether Anthropic reduces its reliance on its two largest customers. The third is how the industry responds to Amodei’s call to slow capability development.