AI news Oct 28, 2026

This week · filing, October 26

Anthropic's unaudited S-1 shows positive operating cash

Anthropic's S-1 cash flow statement shows US$3.929 billion of first-half operating cash inflow, the first positive figure in five periods

Why it matters: Positive operating cash doesn't settle whether Anthropic can pay three cloud contracts that are owed even if the capacity goes unused. That depends on how fast usage grows.

Anthropic filed its IPO registration statement, the S-1, on October 26. SecondSource's October 27 issue covered the filing's three cloud compute contracts that must be paid whether the capacity is used or not. Today's item reads the consolidated cash flow statement on page F-12 of the same filing. Net cash from operating activities was an inflow of US$3.929 billion in the first half of 2026, and the four earlier periods in the table were all outflows. The first-half figures are prepared by the company and unaudited (Anthropic S-1, 2026-10-26).

The same page shows US$482 million of equipment purchases and US$2.185 billion of stock-based compensation in the first half. Stock-based compensation is pay in shares: it counts as an expense but uses no cash. The filing also shows a first-half net loss of US$80.748 billion. Of that, US$72.388 billion is the increase in the book value of a note that can be converted into shares. The higher Anthropic's valuation, the more the shares from that conversion are worth, so the liability on the books grows without any cash leaving. That is how a large net loss and a positive operating cash flow can hold at the same time.

Gavin Baker, chief investment officer of the investment fund Atreides Management, posted four times on X on October 26 after reading the filing. In one post, Baker wrote that Anthropic is "FCF positive after SBC," which is "at odds with the prevailing narrative that has been circulated here from various macro focused accounts." Baker didn't name those accounts (Gavin Baker on X, 2026-10-26). A second post said Anthropic's "$35ish billion in future annual commitments are easily digestible given their revenue" (second post). Baker also estimated that Anthropic's annualized revenue "has likely gone vertical in October after they cut token prices." That estimate rests on usage data from OpenRouter, a third-party platform that routes developers' calls to many AI models. It does not rest on anything Anthropic disclosed (first post; second post).

Subtracting the two lines from operating cash flow, US$3.929 billion minus US$482 million minus US$2.185 billion, leaves US$1.262 billion, still positive (our calculation). The S-1 itself neither defines nor reports free cash flow. Baker's US$35 billion a year doesn't match the filing. The S-1 gives only total commitments: about US$265.6 billion as of June 30, plus US$245 billion in contracts signed afterward, with terms of 1 to 20 years. The first version of the filing leaves the year-by-year payment amounts blank.

Not proven yet: Baker's US$35 billion a year has no matching figure in the S-1 How we checked →

Judgment update: SecondSource's October 27 call stands. That call was that if revenue falls short, Anthropic's own cash and its shareholders absorb the gap first. Our reading: contract commitments don't appear on the cash flow statement, so "cash flow turned positive" doesn't answer who carries a gap. Anthropic's cash in the first half came mainly from US$110.774 billion of net financing inflow, not from the US$3.929 billion of operations. The filing also says net outflows will continue. The call turns on future usage. If usage keeps growing at its current slope, the compute Anthropic actually uses will exceed the contract minimums. Then no shortfall payment is due, and Baker's "easily digestible" holds. If usage falls behind, the shortfall is still owed. Anthropic's cash covers it first, and shareholders ultimately bear the cost. What would prove this wrong comes in two tests. First, an amended S-1's year-by-year payments may show every year's minimum for the next three years below the latest reported revenue at an annual rate. Then "shareholders carry it first" becomes a secondary scenario. Second, the first two years' payments may exceed cash on hand plus revenue. Then Baker's "easily digestible" doesn't hold. SecondSource set the three-year and two-year windows as check periods. Investor note: The reading under test is Baker's "easily digestible." First-half operating cash inflow describes cash in and out; the contract burden has no year-by-year figures to check yet. Until the yearly payment amounts appear, "easily digestible" remains one investor's framing.