Half a trillion dollars — that's roughly how much investors are shaving off Anthropic's expected IPO valuation before its November listing. Reuters reports the number on the table a week ago was $2 trillion; at a private investor day in San Francisco, the figure now circulating is $1.5 trillion.
The reason isn't a miss — it's a slowdown. Anthropic's revenue jumped from $4.7 billion in Q1 to $11.6 billion in Q2, a 147% leap. In Q3 the gain was far more modest: $16.8 billion, up 45% quarter over quarter. For most companies, that growth rate would be the stuff of headlines. For a startup priced on doubling every quarter, it reads as a reason to dial back expectations.
Run the math against annualized Q3 revenue and a $2 trillion price tag implies a multiple near 30x. At $1.5 trillion, that drops closer to 22x — still rich by traditional market standards, but closer to how the rest of the red-hot AI sector trades. Anthropic also says it turned adjusted-basis profitable in Q3, so this isn't purely a story about losses.
Behind the valuation debate sits a massive bet: the company previously committed roughly $518 billion in compute spending over the next decade, a wager it needs to keep pace with OpenAI and Google. That's exactly why any growth slowdown makes investors nervous — the infrastructure money is already promised, leaving less room for error.
One caveat worth keeping in mind: Anthropic itself hasn't set an official IPO price. The $1.5 trillion figure reflects what prospective buyers are discussing, not what the company is asking. If that caution holds through November, what was billed as the biggest IPO in AI history could open with a discount instead of a record.
