Anthropic Posts Nearly $42B Loss for 2025 — but $34B of It Was an Accounting Write-Down

Anthropic, the developer of Claude, reported a net loss of nearly $42 billion for 2025. Most of that sum, however, is not tied to actual spending on AI development or company operations: about $34 billion came from an accounting revaluation of financial instruments that could later be converted into shares.

The figures come from Anthropic’s confidential IPO prospectus, which Reuters has reviewed.

As Anthropic’s valuation climbed, so did the estimated value of obligations tied to earlier funding rounds. That produced a huge non-cash accounting expense and sharply inflated the final net loss.

A more accurate picture of the company’s finances is therefore its operating loss of $8.06 billion. A year earlier, that figure stood at $2.98 billion.

Revenue Grew Nearly 12-Fold

At the same time, Anthropic keeps expanding its business rapidly. Revenue for 2025 reached nearly $4.6 billion — roughly 12 times more than a year earlier.

Costs are rising almost as aggressively. Total operating expenses hit $12.65 billion, with $7.33 billion spent on computing power and infrastructure alone — about three times the 2024 figure.

The cost of training and running large AI models remains one of the company’s biggest financial challenges.

At the end of 2025, Anthropic held $20.28 billion in cash, cash equivalents and short-term investments, so the company is not yet anywhere near running out of liquidity.

Its business, however, depends heavily on a few large customers. Just two clients accounted for nearly a quarter of all revenue for the year, and Anthropic warns that many of its biggest customers are not bound by long-term contracts and could cut spending.

Another $518 Billion Reserved for Infrastructure

Anthropic’s future obligations look especially large. According to the documents, the company has committed to spending roughly $518 billion on cloud capacity, computing infrastructure and related contracts in the years ahead.

That figure does not mean Anthropic plans to spend half a trillion dollars at once. These are multi-year contractual commitments needed to train and run future Claude models.

The scale of the investment shows just how capital-intensive the race among leading AI companies has become: building models requires not only researchers but also vast amounts of computing power, data centers and specialized accelerators.

Anthropic Prepares for One of the Largest IPOs

The company is preparing to go public and is weighing a valuation above $2 trillion. If that level holds until the offering, Anthropic will become one of the most valuable technology companies in the world.

Investors, though, will have to weigh two opposing trends: Anthropic’s revenue is growing extremely fast, but so are its operating losses and long-term infrastructure costs.

That makes the $42 billion headline figure look far more dramatic than the reality. Most of it stems from an accounting revaluation of funding, while Anthropic’s actual operations produced an operating loss of about $8 billion — still a huge sum, but roughly five times smaller than the final net result.