{"version":1,"type":"story","url":"https://digestai.news/story/sonnet-5-5-matches-opus-5-5-on-three-tasks-with-the-1020-trick","json":"https://digestai.news/story/sonnet-5-5-matches-opus-5-5-on-three-tasks-with-the-1020-trick.json","markdown":"https://digestai.news/story/sonnet-5-5-matches-opus-5-5-on-three-tasks-with-the-1020-trick.md","slug":"sonnet-5-5-matches-opus-5-5-on-three-tasks-with-the-1020-trick","headline":"Sonnet 5.5 matches Opus 5.5 on three tasks with the 1020 trick","summary":"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 correct. The test was based on a single manual measurement per task with a stopwatch, and prior model values were from September 25 and not re-measured.","keyPoints":["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"],"whyItMatters":"Shows how small behavioral shifts in models can be spotted with consistent, simple tasks, helping users evaluate upgrades without relying on benchmarks or vendor claims.","category":{"slug":"agents","name":"Agents & Tools","url":"https://digestai.news/category/agents"},"entities":{"companies":["YaroTech"],"models":["Sonnet 5.5","Sonnet 5","Opus 5.5","GPT-6 Luna"],"people":["Kuro-suke"]},"firstPublishedAt":"2026-09-29T18:34:00Z","updatedAt":"2026-09-29T18:34:00Z","sourceCount":1,"hasPrimarySource":false,"sources":[{"outlet":"note.com","title":"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","url":"https://note.com/yaoyoroztech/n/nb3ee4de0b36b?hl=en","publishedAt":"2026-09-29T18:34:00Z","type":"press","primary":false,"lead":true}],"sourceNotes":null,"discussions":[],"thread":null,"cite":{"text":"Digest AI, \"Sonnet 5.5 matches Opus 5.5 on three tasks with the 1020 trick\", 29 September 2026, https://digestai.news/story/sonnet-5-5-matches-opus-5-5-on-three-tasks-with-the-1020-trick","publisher":"Digest AI","title":"Sonnet 5.5 matches Opus 5.5 on three tasks with the 1020 trick","datePublished":"2026-09-29T18:34:00Z","url":"https://digestai.news/story/sonnet-5-5-matches-opus-5-5-on-three-tasks-with-the-1020-trick"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}