I built an 11-tab financial model in 10 minutes + the prompting guide that makes it repeatable

Source: Nate’s Newsletter Date: 2026-01-27 URL: https://natesnewsletter.substack.com/p/anthropic-just-put-claude-inside

Summary

Nate demonstrates Claude embedded in Excel building an 11-tab financial model with sensitivity analysis in 10 minutes, then argues the real story is Anthropic’s data partnerships with LSEG, Moody’s, and S&P Capital IQ — proprietary financial data access competitors can’t easily replicate. The strategic frame: AI competition is shifting from model quality to workflow embedding backed by exclusive data moats. Microsoft simultaneously hosts Claude, competes against it, and pays Anthropic $30B — coopetition as the new competitive structure.

Implications

• AI economics thread. Data partnerships as the next competitive moat is a clear signal: raw model quality is commoditizing, but proprietary data access embedded in workflow tools is durable. LSEG/Moody’s/S&P partnerships make Claude’s financial modeling capability something OpenAI can’t simply copy with a better model.
• Agent-product positioning thread. “Where intelligence operates, not how good it is” as the competitive frame redefines product differentiation. Claude in Excel at $20/month democratizes financial modeling that previously required weeks and specialist skills — that’s a genuine workflow transformation, not a marginal improvement.
• Watch: Whether Anthropic’s data partnership model extends to other verticals (legal, medical, technical), and whether Microsoft’s coopetition relationship with Anthropic becomes a genuine competitive tension as their own Copilot investments mature.