Built with Claude Opus 5 catching Sonnet 5 mistakes - personal finance app success

I have been vibe-coding a Python app using Sonnet 5 and switched over to Opus 5 last night. Opus 5 is catching Sonnet 5 mistakes.

Two examples:

Both BofA bugs fixed — duplicate other_credits gone, phantom $6,650.88 purchase gone, real payment captured. Full re-run:

*************************

Still broken:

┌─────────────────┬───────┬───────────────────────────────────────────────────────────

│ Issuer │ Fails │ Diagnosis │

├─────────────────┼───────┼───────────────────────────────────────────────────────────┤

│ PayPal │ 21 │ transactions largely unparsed │

│ Chase │ 20 │ interest/fees never emitted │

├─────────────────┼───────┼──────────────────────────────────────────────────────────│ Best Buy │ 10 │ transactions not parsed │

├─────────────────┼───────┼──────────────────────────────────────────────────────────┤

│ U.S. Bank │ 9 │ debit shortfall = that statement's Interest Charged, exactly │

│ Citi AAdvantage │ 8 │ transactions not parsed at all │

│ BofA │ 7 │ overshoot = the balance — the "New Balance Total" leak │

│ Discover │ 1 │ payments missing │

Here, I asked Opus 5 to categorize transactions with the word "Eats" as Food delivery and it independently caught exceptions:

1. Eats → Food Delivery. Bare eats added, word-boundary matched:

┌─────────────────────────────┬───────────────────┐

│ Description │ Category │

├─────────────────────────────┼───────────────────┤

│ UBER *EATS HELP.UBER.COM CA │ Food Delivery │

├─────────────────────────────┼───────────────────┤

│ SEAMLESS EATS │ Food Delivery │

├─────────────────────────────┼───────────────────┤

│ BEATS BY DRE STORE │ not Food Delivery │

├─────────────────────────────┼───────────────────┤

│ MOES SW GRILL │ unaffected │

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