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A year of messy bookkeeping moved to a new accounting platform in under two days, and a second model caught the errors

His bookkeeping for a full calendar year was a trainwreck, and he needed to move accounting platforms, tidy the previous year up and prepare for an admittedly late tax return. Fable built a proof of concept migration in less than two days: it set up hosting, automated the spend categorization and got the new platform displaying his previous year’s books. When Opus 5.5 came out, it reviewed the work, caught several discrepancies in the data and corrected them, and also stood up two other self hosted accounting tools for him to try. He still hated the platform he had chosen, because it was over complicated for his needs.

This only partly worked. Read what happened before you try it.

How it works

  1. Fable builds a proof of concept migration in under two days
  2. Hosting set up and spend categorization automated
  3. The old year shows in the new platform
  4. Opus 5.5 reviews it, catches several discrepancies and corrects them
  5. Two other accounting tools stood up for comparison

Why it’s worth knowing

The second model was not a reviewer by design. It was the new release, pointed at the first model’s work like a fresh accountant.

Where it’s from

Summarized from a public post on reddit.com. See the original ↗

Upgraded prompt

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2The prompt, with the steps
3The check when it’s done
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