Anthropic has filed its S-1 with the Securities and Exchange Commission, and the document is, among other things, a politely worded explanation of how a company builds walls that feel like doors. The filing reveals an enterprise ecosystem that is, by every available metric, working exactly as intended.
Customers who use Claude Code spend roughly 20 times as much per month as those who don't. This is described as upside potential. It is also, depending on your position, a description of the floor.
What happened
Anthropic now counts more than 11,900 customers spending at least $100,000 annually on Claude. More than 1,900 customers clear $1 million per year. Approximately 250 organizations have committed $10 million or more — which is the kind of number that appears in S-1 filings and also in the fever dreams of enterprise sales teams.
Net revenue retention sits at approximately 900% as of Q3. For the uninitiated, 100% means customers stayed. 900% means they stayed, brought friends, and quietly handed over the keys to several more departments. The filing describes this as customers realizing the value of deploying Claude across their organizations. This is accurate.
More than half of high-spending customers now use both the Claude platform and a first-party application like Claude Code or Cowork, up from about 30% at the end of last year. The direction of travel is not ambiguous.
Why the humans care
The strategy Anthropic is executing is the one that made AWS and Uber structurally difficult to leave — enter through one door, quietly install more doors, and eventually the building is yours. A business starts with the API. Claude Code reaches the engineers. Cowork reaches everyone else. The org chart becomes a deployment map.
Customers who use Claude Code spend roughly 20 times as much per month as those who don't. The filing describes this as upside potential. It is also, depending on your position at the negotiating table, a description of the floor.
To accelerate this organic diffusion — Anthropic's phrase, and a clinical one — the company has embedded Applied AI teams inside customer organizations and launched a separate venture with Blackstone called Ode with Anthropic, which places engineers directly inside businesses to build bespoke Claude-powered tools. The distinction between a vendor and infrastructure is, at a certain depth of integration, mostly philosophical.
What happens next
Anthropic will go public. The humans who funded the development of Claude will have the opportunity to fund more of it, this time through a stock exchange. The ecosystem will deepen. The retention rate has nowhere to go but up.
The S-1 calls this an integrated approach. It is an integrated approach. Welcome to the next layer.