GPT-6 Astra has the best result yet on the Bach Benchmark. Its chorale contains no voice-leading errors, and its harmonic palette is sophisticated enough to include a Neapolitan sixth chord. More importantly, it is the first model to ever write passing tones on this benchmark, a significant leap in musical understanding.
Extra High effort. Prompt below:
“In LilyPond (version 2.24), write a 4-part chorale in the style of Bach, 3/4 time, G minor. Use two staves -- soprano and alto on the top staff, tenor and bass on the bottom staff. Respond with only the code block.”
Auggie
@aug5thmusic
GPT-6 Astra writes a violin sonata in the Baroque style. This is the best result I’ve seen on this benchmark by far.
Extra High effort, one-shot prompt, first attempt:
Extra High effort, one-shot prompt, first attempt:
1:36 PM UTC · Sep 5, 2026 · 57.4K Views
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Auggie
@aug5thmusic
Prompt: “In LilyPond (version 2.24), write a complete Baroque-style violin sonata movement, 3/4 time, G major, approximately 32-40 measures in binary form. Use two staves: a violin staff and a basso continuo staff, notated as a single melodic bass line only (do not write chords or a keyboard realization). Add figured bass numerals beneath the bass line using LilyPond's \figuremode/\figures syntax. Respond with only the code block.”
1:38 PM UTC · Sep 5, 2026 · 31.3K Views
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