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Opus 5.5 on Extra High effort achieves a great result on the Bach Benchmark. The…

Opus 5.5 on Extra High effort achieves a great result on the Bach Benchmark. The cadential figure in measure 3 is pure…

This is a AI post classified by Jev as Frontier models (a model release), kept by the AI Radar because it carries real work, not commentary.

Opus 5.5 on Extra High effort achieves a great result on the Bach Benchmark. The cadential figure in measure 3 is pure Bach, a mainstay of his chorales. No LLM before Opus 5.5 has used it, so I was glad to see it. I would put this chorale on par with Astra’s.

Posted by Auggie (2.9k followers) 1 h ago · 51 likes · 1.8k views · view the original post on X. Kept by the AI Radar as Frontier models.

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Every post is read and classified by Jev (TypeSafe): what it is, which market it belongs to, and whether the link is a real tool. 44.3k posts from 5k X accounts over the last 14 days, 1.8k tools, 19 markets. Collected every 5 minutes, fully re-ranked every hour — last update 2026-09-23 13:36 UTC. Full method.