Anthropic suffered an eye-watering net loss of $80.7bn in the first six months of 2026 as soaring valuations turned convertible debt into an accounting nightmare ahead of its planned November stock market debut. A draft prospectus reviewed by Reuters shows that paper charges drove most of the damage, specifically a $72bn adjustment tied to the rising value of convertible notes rather than direct day-to-day cash outflows. Phantom liabilities mock Silicon Valley balance sheets. The San Francisco firm saw its net shortfall swell from $13bn a year ago, exposing the financial quirks that haunt artificial intelligence firms that borrow heavily through equity-linked debt. Even with rocketing user numbers, high tech debt brings painful consequences.
The staggering figures illustrate how expensive the race for artificial intelligence supremacy has become for private developers building large language models. Anthropic burned nearly $9bn on raw computing power and server centres during the first half alone, nearly quadrupling its infrastructure outlays from $2.3bn during the same period in 2025. Data centres devour private capital fast. The startup has tied itself to long-term commitments worth at least $518bn over the coming decade to secure computing time from major cloud operators. The company needs massive cash reserves to keep its flagship coding assistant, Claude Code, ahead of well-funded rivals.
Prospective investors attending an October 14 pitch meeting learned that third-quarter revenue grew 45% to $16.8bn, showing solid commercial demand while revealing a clear deceleration from previous quarters. That slower sequential rise from the $11.6bn recorded in the second quarter left several institutional fund managers wary of paying top dollar for new shares. Cooling revenue growth rattles institutional buyers. Prospective backers who previously considered a $1.5trn valuation are now recalculating what they are willing to pay for an enterprise that lost $8.1bn on operations last year on just $4.6bn in sales. Wall Street wants to see real cash profits rather than endless promises of eventual monopoly power.
A tepid public listing next month could puncture tech market valuations and dampen sentiment ahead of OpenAI’s anticipated stock flotation next year. Global markets treat Anthropic as a key test case for whether commercial tech products can ever generate enough cash to justify trillion-dollar infrastructure bets. The entire industry watches this sale closely. If public markets balk at these colossal accounting losses and trim Anthropic’s target listing price, private financiers will tighten credit terms for dozens of junior AI labs that burn millions every day. Venture capital bets can unravel quickly.