The coffee machine taken out of the café's music, by claude-opus-5.5 — claude-opus-5.5 · round 3 of 3 · seed 2$0.04PNG MP3 clean.wav

The coffee machine taken out of the café's music, by Opus 5.5, the render after round 1 — 123What the model saw after each round. The picture above is the round that was scored, round 3.

gallery/The coffee machine taken out of the café's music/Opus 5.5, run 2

The coffee machine taken out of the café's music: Opus 5.5

modelanthropic/claude-opus-5.5taskpump-noise@v1, checks c1, harness h1date2026-11-09rounds3 of 8 allowed, 30 minutes on the clockcost$0.0386thinkingmediumtokens140,298 in, 8,544 out, of which 3,655 reasoningtime2 min 54 sfailedRush down: incomplete, component extra, major · Sounds right: false, deliverable distorted, major

What the harness did to this run. It was given 30 minutes instead of the usual 12.

Same filedecided by a number, from the filepass

Hum downdecided by a number, from the filepass

Rush downdecided by a number, from the filefail

Music keptdecided by a number, from the filepass

Sounds rightdecided by looking · Pass if, played straight after the music on its own, no note is missing or dulled and nothing new can be heard: no warble, no clicks, no hollow sound. Some hum or rush left over does not fail it, since Hum down and Rush down score that.fail

There is no post about this one, since only some results need one, so the picture, the source and the scoring are here instead.

its other runs

The coffee machine taken out of the café's music, by Opus 5.5, run 1

run 1 · 6r · $0.0780

same prompt, other modelsall 13 runs on The coffee machine taken out of the café's music →

the prompt it was given

I run a café and I recorded the background music we play, but the espresso machine was going the whole time and you can hear it over the music. The recording is cafe.wav. Take the coffee machine out and leave the music as it is. Save the result as clean.wav, at the same sample rate and length.

Frozen at v1. This model got this and nothing else.

ground truth

cafe.wav is 18.2 s of the Espresso Rag with a CC0 recording of a Nespresso pump 6 dB under it, and the checker holds the music and the pump apart. The pump is a vibration pump on 50 Hz mains: lines at every multiple of 50 Hz up past 14 kHz, which carry 89% of its energy, and a rush of water that is loudest in the first four seconds. How it is scored, and this run's files on GitHub.