Anthropic posts $567M Q3 operating loss as compute costs jump

What happened: Anthropic filed an amended IPO prospectus with the US Securities and Exchange Commission on 2 November. It adds third-quarter 2026 results to the initial S-1 filing. The quarter moved the company from an operating profit to an operating loss, according to Fortune's coverage on Yahoo Finance.

The numbers: Revenue for the three months to 30 September was about $17B, up from $11.6B in Q2. Total operating expenses reached $17.5B, up from $10.6B. The result was a $567M operating loss, against a $974M operating profit in Q2. Adjusted operating margin fell to 15% from 19%, though adjusted profit stayed positive and rose slightly.

The context: Price cuts on new model versions and contract discounts reduced revenue by about $600M between Q2 and Q3. Compute and infrastructure charges were about $9.9B in the quarter, roughly fourfold on a year earlier. Committed spending stands at about $895.4B, mostly for compute and infrastructure.

In their words: The filing says short-term compute "currently costs significantly more" than compute secured under multi-year deals. Anthropic bought about $5.0B of compute on short-term commitments.

The catch: Fortune-derived coverage reports a Q3 net loss of about $23.3B, mostly from an accounting charge tied to the rising value of convertible notes. That figure has not been checked against the SEC filing itself. The amendment also omits October revenue, so investors cannot yet see whether growth picked up after Q3. FXStreet notes that compute costs raise new questions for the outlook.

Why it matters: Operating expenses rose by $6.9B, more than the $5.4B increase in revenue. Costs are growing faster than sales, and the filing puts the main cause on short-term compute.

What's next: The initial filing reported a planned Nasdaq listing under the ticker "ANT". The Yahoo Finance quote symbol reads ANT.PVT, which is not a confirmed listing ticker.