I asked Claude Opus 5.5 to design a robot spider with no CAD software.
500 parts. 30 joints. 6 legs, 2 arms with grippers.
Every part is a Python program. One YAML file holds the numbers. It exports a STEP file, a URDF and a MuJoCo model.
Then I dropped it into a physics sim. It walked on the first try.
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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.”