Anthropic’s growth just flattened (really)

Anthropic reported Q3 revenue of $16.8 billion to investors, per NYT DealBook reporters Andrew Ross Sorkin, Lauren Hirsch, and Sri Muppidi, capping a year of unprecedented growth ($4.8 billion in Q1, $11.6 billion in Q2) but revealing a sharp deceleration: sequential growth slowed to +45% (+$5.2 billion) from Q2's +141% (+$6.8 billion), meaning the company added less revenue in dollar terms than the prior quarter. Back-of-the-envelope monthly estimates using a reported $65 billion annualized run-rate in July (~$5.4 billion/month) suggest growth nearly flattened from July to September, with average monthly gains slowing from ~$760 million in Q2 to ~$580 million in Q3. The slowdown is pressuring "neocloud" providers like CoreWeave, which have borrowed tens of billions of dollars betting on sustained hypergrowth in AI compute demand, just as soaring interest rates raise their debt carrying costs. Anthropic notably did not share a September-based annualized revenue figure at the investor meeting, which analysts read as a signal the number was unflattering. What to watch: Anthropic's Q4 results and any updated run-rate disclosures, which will shape its IPO valuation and the broader trajectory of AI-sector valuations.