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How I solve problems in real products: what didn't work, what did, and the numbers.

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AI LLM Case study

~97%categorisation accuracy

1 Oct 2026 · 6 minThe model never computes a numberMy AI finance advisor invented numbers on real bank data, and instructions didn't stop it. A check in code did, and the same idea cut AI cost by ~80%.

~97%categorisation accuracy~80%lower AI cost35 / 36new merchants right, for $0.03

AILLMCase study

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