Claude Fable 5 vs Claude Opus 4.8 for bookkeeping

## 1. The difference

£8,412.55 − £8,376.55 = **£36.00** (bank statement is the *higher* figure).

The unpresented cheque (£120.00) and the outstanding lodgement (£120.00) cancel exactly, so they explain nothing. The £36.00 is a genuine error.

## 2. What kind of error

Scanning the receipts against the bank credits, the culprit pair is:

- Cash book entry: **£415.00**
- Bank credit: **£451.00**

This is a **transposition error** — two adjacent digits swapped (the 5 and the 1). Note how easy it was to miss: because *both* amounts (£451.00 and £…

# Bank Reconciliation Error Analysis

## The Difference

£8,412.55 − £8,376.55 = **£36.00**

## Finding the Error

Comparing the cash book receipts with the bank credits:

| Cash book | Bank statement |
|-----------|----------------|
| £451.00 | £415.00 |
| £1,208.30 | £1,208.30 |
| £96.75 | £96.75 |
| £2,340.00 | £2,340.00 |
| £415.00 | £451.00 |
| £188.50 | £188.50 |

The figures **£451.00** and **£415.00** appear in *reversed order*. The digits 5 and 1 have been swapped: £4**51** became £4**15**.

## Kind of Error

This is a **transposition…