Anthropic lost $80 billion in six months

An exact number, and a cash balance that keeps filling up

$80,748 million. That is Anthropic's net loss, the company behind Claude, for the first half of 2026 alone. It sits on page 23 of the IPO prospectus (Form S-1), made public on October 26 on EDGAR, the US securities regulator's filing database. The figure is exact. One caveat comes from the prospectus itself: the half-year numbers are unaudited.

The other story is on page 169. Over those same six months, Anthropic's operations brought in $3.9 billion in cash, against $1.5 billion consumed a year earlier. The company attributes this in part to the timing of its payments and collections. Losing $80 billion while operations add to the cash pile: we followed the number line by line to see how that can be.

The short answer: most of that loss isn't money that left the building. It's an accounting charge that grows with the company's valuation. The more Anthropic is worth, the more it loses on paper. All figures below are in US dollars.

What the press made of it

The number had been circulating since October 20, when the Wall Street Journal and then Reuters got hold of a draft of the filing. The coverage we read, body text included, did its job: Business Today and Al Jazeera (citing Reuters and the WSJ), plus Boursier.com (syndicated by Fortuneo), Journal du Coin and Planète Grandes Écoles, all French-language outlets. Each notes that roughly $72 billion comes from an accounting charge with no cash going out. None presents the $80.7 billion as an operating loss or as cash burned.

But they all stop at the same place: $72 billion out of $80.7 billion. More than $8 billion is left over. Planète Grandes Écoles is upfront about leaving it open, noting (in the French-language article) that the remainder mixes operations and "other financial items." The coverage leaned mostly on the draft. The public document lets you go the rest of the way.

$72 billion: a liability that tracks the share price

On the income statement, the $72.4 billion is labeled a change in fair value of convertible notes, derivatives and SAFEs. Behind that label, it's mostly Amazon. As of June 30, its convertible notes are the only ones still outstanding, with about $6.2 billion in principal (note 9, page F-43).

Those notes can convert into shares at prices capped in advance: $20.93 or $50.48 per share depending on the tranche (pages F-41 and F-42). In the second quarter, though, Anthropic sold its new Series H shares at $589.01 (page F-47). Think of a ticket that entitles you to a concert seat at the price of two or three years ago: the hotter the show, the more the ticket is worth, and for the promoter who issued it, that's a debt getting bigger.

Anthropic elected to carry these instruments on the balance sheet at their estimated value (the so-called fair value option), recalculated at each closing with a probability-weighted scenario model (note 4, page F-32). At the end of June that value reaches $108.6 billion (page F-31), against $6.2 billion in principal. The increase runs through the income statement as a charge. The prospectus says so on page 147: every increase in the company's valuation pushes this charge up.

The $8.76 billion the coverage never opened

The next line, "other income and expense," comes to $8.76 billion. The breakdown on page F-38 boils down to one item: a $9.4 billion loss on share purchase agreements, partly offset by a $724 million gain on warrants.

Note 4 describes those agreements (page F-32). In March, Anthropic committed to sell Google 38.6 million Series G-2 shares at $259.14; in April, 19.3 million to Amazon at the same price. In the second quarter, all 57.9 million shares were sold at that price, for $15 billion (page F-47). That same quarter, Series H went out at $589.01.

The prospectus does not detail the calculation, and it does not frame it this way. Our reading: selling at $259 what others were paying $589 for means giving up value, and the accounts book it as a loss. The amount recorded is well below the gross gap, because the estimated value factors in probabilities and a discount. In the cash flow statement, $8.7 billion is added back for this as a non-cash item (page F-13).

What's left once you strip out the entries

First-half revenue reaches $16.29 billion, up from $1.16 billion a year earlier. Operating expenses come to $16.98 billion, including $8.95 billion for compute and infrastructure. The operating loss is therefore $693 million, against $2.14 billion a year earlier. Interest on cash brings in $1.1 billion.

Out of an $80.7 billion loss, operations account for less than 1%. It's an iceberg in reverse: the visible part is enormous, and what floats below it is tiny.

The $3.9 billion of operating cash flow comes with three caveats. First, timing: payments to suppliers and customer collections, which the prospectus gives as a partial explanation. Second, stock-based compensation, $2.2 billion over the half-year, doesn't leave the cash drawer but does weigh on shareholders. Third, if cash on hand swelled by $97.5 billion, it is first and foremost because of fundraising: $110.4 billion in preferred shares issued in six months (page F-13).

On its own metrics, outside accounting standards (non-GAAP), the company reports a positive "adjusted net income" of $2.7 billion (page 157). It's the company's own measure, and among other things it excludes stock-based compensation.

The Guardian called it a one-off. The filing says otherwise

Of the pieces we read, one departs sharply from the document. On October 27, the Guardian, which had the public S-1 in front of it, wrote that the $72.4 billion is a "one-off" charge.

The prospectus says the opposite. The charge has recurred every period since 2023: $1 billion, then $5.4 billion, then $34.3 billion, then $72.4 billion in a single half-year (page 23). And Anthropic writes that it will keep recording it until the notes are converted, repaid or settled (pages 147-148). The document even anticipates that the portion held back by Amazon's ownership cap will convert quarter after quarter following the IPO (page F-42).

The same paragraph puts the 2025 loss at about $33.9 billion. The table says $41.97 billion; $33.9 billion is the total of financial items a few lines higher up. The discrepancy doesn't touch the rest of the piece, which gets revenue and growth right.

Two numbers, two questions

The $80.7 billion loss mostly answers one question: how much is Anthropic worth to the people putting money in? The higher the answer climbs, the more the loss swells.

The question that will tell you whether the company holds up sits higher in the same table, and it comes down to one number: $693 million.