Opus 5 shipped on July 24: near Fable 5 intelligence at half the price, with a real jump on numerical reasoning, tables, and financial modeling, the exact work a founder without a finance team keeps getting wrong.
At Startup School, Boris Cherny, the creator of Claude Code, said they deleted more than eighty percent of Claude Code’s system prompt for Opus 5 → His advice even to non-builders: every six months, delete your skills and config and see what happens. It might surprise you.
So this instead of being a pile of prompts, is six reusable Skills you build once and Opus 5 loads on its own.
📚 In this guide you’ll get copy-and-paste Skills to:
Compare actuals to budget and prior month, explain every variance and list what to investigate
Break down unit economics by channel and cohort, decompose gross margin and show which channel or cohort actually loses money
Model a price change under different churn responses, give you the break-even churn and flag the segments that are underpriced
Build a 12-month rolling forecast as an Excel file, run base, bear and bull scenarios, and tell you which single assumption moves your runway most
Size the raise off your forecast, model the dilution across the cap table including the option pool, and check your target valuation against comparable rounds
Build a live KPI and runway dashboard that pulls from your connected tools and generate the answer-first monthly investor update from the same numbers
Inside you will find:
How to Set Up Your Finance Skills So Opus 5 Runs on Your Real Numbers
How to Close the Month and See Where You Actually Stand
How to Find Where Your Unit Economics Leak Money
How Much Room You Actually Have to Raise Prices
How to Build a Forecast and Stress It Before You Bet on It
How to Size the Raise and Model the Dilution Before the First Meeting
How to Track the Numbers Live and Tell the Story Investors Trust
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