Sonnet 5.5 matches Opus 5.5 on three tasks with the 1020 trick
YaroTech tested Sonnet 5.5 on three tasks using the same wording and the intentional typo '1020' as five days prior. The model showed similar performance to Opus 5.5 from that time, including correcting the defect rate using operating hours and connecting findings to meeting notes. Two supplementary numbers in the output did not match manual checks, though the requested calculations were…
Key points
- Sonnet 5.5 corrected the '1020' typo using operating hours, like Opus 5.5 did five days ago
- Sonnet 5.5 linked its analysis to meeting notes and order increases, matching Opus 5.5's earlier behavior
- Two supplementary defect rate values in Sonnet 5.5's output did not match manual verification
Model pages: Sonnet 5.5 → · Opus 5.5 → · GPT-6 Luna →
What only Opus 5.5 could do 5 days ago, Sonnet 5.5 has now done — Checking answers with the same 3 tasks and the same 1020 trick
note.com · 29 September 2026
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