Anthropic just went from $9 billion to over $30 billion in revenue in 4 months.

Krishna Rao is the CFO who runs the finance function behind that number. Last week on the Invest Like the Best podcast, he talked about how his team uses Claude to do their own monthly close.

The numbers he gave are remarkable.

Statutory financial statements for all of Anthropic’s legal entities are now produced using Claude. A human checks the output. Claude does the work.

The team has built a library of finance-specific skills, more than 70 of them at last count, sitting in a shared repository that everyone can access.

On top of that library, they built one skill called MFR. The monthly financial review skill. Krishna’s quote on it.

It can produce our monthly financial review. It’s 90 to 95% ready and then all of our discussion becomes about what do we do, what are the implications, not what exactly happened. Because Claude is not just reporting the weather. It’s also helping to think about drivers and why the number changed the way it did.

A weekly revenue or compute utilization report that used to take hours now takes 30 minutes. The biggest internal Claude user inside the finance team is not the 22-year-old who joined with a coding background. It is the head of tax.

That is what the closed-loop MFR looks like when it works.

I built the version of it that every CFO must install.

One MFR skill installed inside Claude. It reads the actuals. It surfaces the signals. It builds the visual reasoning. Then it refuses to produce the deck until the CFO answers four guided questions, each grounded in the evidence the skill built first.

I tested it on Born2Cycle.

Krishna’s MFR skill is built on Anthropic’s books. I built on a CFO-grade synthetic dataset that mirrors a real retail finance function. The architecture is the same. The reasoning workflow is the same. The output shape is the same.

I am sharing the full install below.

Let’s dive in.

Step 1: Create the Monthly Financial Review project in Claude

Go to claude.ai.

Click Projects on the left, then click New Project.

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