Anthropic, the company behind the Claude AI assistant, recorded a staggering $80.7 billion net loss in the first six months of 2026. But the headline figure tells only part of the story. Nearly $72 billion of that loss came from an accounting adjustment linked to convertible bonds, rather than money spent running the business.

The figures, disclosed in a draft prospectus for Anthropic‘s planned initial public offering (IPO), come at a crucial time for the San Francisco-based AI startup. The company is expected to make its stock market debut in November, with some investors now considering a valuation of around $1.5 trillion.

Anthropic’s first-half loss was more than six times the $13 billion reported in the corresponding period last year. The sharp increase has drawn attention to its financial position ahead of what could be one of the most closely watched listings in the artificial intelligence industry.

Why Anthropic’s $80.7 Billion Loss Is Not What It Seems

The biggest factor behind Anthropic’s ballooning loss was a $72 billion charge arising from an increase in the estimated fair value of bonds that can eventually be converted into company shares.

These instruments will become increasingly expensive in terms of accounting as the valuation of the private company increases. In the case of Anthropic, the modification has made the reported net loss much larger without any real cash outflow.

While the accounting charge explains much of the extraordinary loss, Anthropic is still spending heavily on the infrastructure required to develop and operate its AI models.

The company spent nearly $9 billion on computing capacity and infrastructure during the first half of 2026, compared with $2.3 billion during the same period last year.

Anthropic has also committed to spending at least $518 billion over the next decade on cloud services, computing resources and infrastructure.

These commitments highlight the scale of investment involved in competing at the forefront of artificial intelligence, where access to computing power remains central to developing increasingly capable systems.

Revenue Reaches $16.8 Billion, but Growth Slows

Despite its mounting expenses, Anthropic continues to report strong revenue growth.

At an October 14 meeting with prospective IPO investors, the company disclosed that third-quarter revenue had risen 45% from the previous quarter to $16.8 billion.

The increase followed an even faster period of expansion earlier in the year, when revenue more than doubled between the first and second quarters, reaching $11.6 billion.

Although the latest figures helped ease some concerns about Anthropic’s considerable spending requirements, the slower quarter-on-quarter growth disappointed some investors.

Anthropic’s Claude Code, an AI-powered coding assistant used by developers to write software and build applications, has been among the products contributing to its commercial momentum.

Anthropic’s Earlier Losses Reveal a Similar Pattern

The latest accounting charge is not an isolated development.

Anthropic recorded a $42 billion net loss in 2025, with much of that figure also attributed to changes in the estimated value of its convertible bonds.

As the company’s valuation increased, the estimated fair value of those notes tripled over the year.

Excluding the accounting charge, Anthropic reported an operating loss of approximately $8.1 billion on revenue of $4.6 billion in 2025.

The figures offer an important distinction between losses driven by financing-related accounting adjustments and those arising from the company’s underlying operations.

They also illustrate why investors evaluating Anthropic’s IPO will need to look beyond the headline net loss to assess its spending, revenue trajectory and prospects for profitability.

A $1.5 Trillion Valuation Faces Investor Scrutiny

Some investors are considering a valuation of approximately $1.5 trillion, according to Reuters.

The timing is particularly significant because the company’s anticipated November listing is being closely watched beyond Anthropic itself.

A weaker-than-expected reception could affect sentiment across the wider AI market, where investors are already questioning whether massive spending on chips, data centres and computing infrastructure will eventually deliver adequate returns.

Anthropic’s debut could also help shape expectations for rival OpenAI, which is considering a possible stock market listing next year.

With two major AI developers approaching public markets, investors will have an opportunity to examine the financial demands of developing advanced AI systems more closely.

What Investors Will Be Watching Before the IPO

Anthropic’s financial picture presents two competing realities.

On one side, its revenue continues to expand, supported by demand for AI products including Claude Code. On the other, the company faces substantial operating costs, enormous infrastructure commitments and a reported loss heavily influenced by financing-related accounting charges.

The central question is not simply how Anthropic accumulated an $80.7 billion net loss. It is whether the company’s growing commercial business can eventually generate sufficient returns to justify its spending and expected valuation.

As its November IPO approaches, the answer could influence investor confidence well beyond Anthropic.

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