Drum machine · gpt-6.1-terra

Output generated Cost / run $0.0826 Runtime 71.5s

Prompt for this run

Build a 16-step drum sequencer using the Web Audio API. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Show four labeled rows for kick, snare, hi-hat, and clap, each with 16 independently toggleable steps. Start with a simple audible pattern. - Treat the 16 steps as one bar of sixteenth notes in 4/4 time. Provide Play, Stop, Clear, and a BPM control from 60 to 180. - During playback, highlight the current step and synthesize the enabled drum voices. Editing steps or BPM must affect playback without creating duplicate sequences. - Stop cancels future hits and resets the playhead to the first step. Clear disables all steps. Starting again uses the currently displayed pattern. - Unlock audio through a user gesture and synthesize distinct percussion sounds from oscillators/noise and envelopes; do not load audio files. Verify: Toggle a step and start playback. Check that the playhead advances across the grid and responds to a BPM change. Stop and start again, checking that the displayed pattern is retained and the playhead restarts from the first step.

⛨ sandboxed Open in new tab ↗

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modelgpt-6.1-terra

vendorOpenAI

harnesspi 0.87.1 · browser iteration

generated2026-10-26

METRICS

runtime71.5s

tokens in137k

tokens out6.1k

cached30k

cost / run$0.0826

Transcript · 25 messages

system

user

assistant

thinking

→ write index.html (16027 bytes)

toolResult

Successfully wrote to index.html

assistant

thinking

→ browser {"action":"inspect","x":0,"y":0,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +1ms

[Browser image supplied to model]

{"console":[],"dom":"▥\nbeatmaker\nA LITTLE RHYTHM MACHINE\nREADY TO PLAY\nYOUR POCKET DRUM MACHINE\nMake a little noise.\n\nBuild a beat, find your rhythm, and let it loop.\n\nPATTERN 01 / 01\nSTEP SEQUENCER\n4 TRACKS / 16 STEPS / 4:4\nPlay\nStop\nTEMPO\nBPM\nClear\nINSTRUMENT\n01\n02\n03\n04\n05\n06\n07\n08\n09\n10\n11\n12\n13\n14\n15\n16\nKick\nLOW / THUMP\nSnare\nMID / SNAP\nHi-hat\nHIGH / TICK\nClap\nMID / CLAP\nClick the pads to create your pattern\nOFF\nON\n1 BAR · 16 STEPS\nMADE FOR MAKING BEATS\nSIXTEEN STEPS. INFINITE POSSIBILITIES.","images":"attached"}

assistant

thinking

→ browser {"action":"click","x":319,"y":510,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

[Browser image supplied to model]

assistant

thinking

**Investigating screenshot color**

I'm trying to understand why the screenshot appears gray instead of the expected green after clicking. It seems that the button's color might not be toggled correctly. Maybe it's related to how the CSS color-mix uses variables. When I inspect the button's style, I see it retains the default UA style. It could be that the screenshot was taken just before the style changes. I'll need to investigate further and inspect each element involved.

→ browser {"action":"click","x":130,"y":377,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

[Browser image supplied to model]

{"console":[],"dom":"▥\nbeatmaker\nA LITTLE RHYTHM MACHINE\nPLAYING\nYOUR POCKET DRUM MACHINE\nMake a little noise.\n\nBuild a beat, find your rhythm, and let it loop.\n\nPATTERN 01 / 01\nSTEP SEQUENCER\n4 TRACKS / 16 STEPS / 4:4\nPlay\nStop\nTEMPO\nBPM\nClear\nINSTRUMENT\n01\n02\n03\n04\n05\n06\n07\n08\n09\n10\n11\n12\n13\n14\n15\n16\nKick\nLOW / THUMP\nSnare\nMID / SNAP\nHi-hat\nHIGH / TICK\nClap\nMID / CLAP\nClick the pads to create your pattern\nOFF\nON\n1 BAR · 16 STEPS\nMADE FOR MAKING BEATS\nSIXTEEN STEPS. INFINITE POSSIBILITIES.","images":"attached"}

assistant

→ browser {"action":"motion","x":0,"y":0,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

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Frame 2, +534ms

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Frame 3, +1063ms

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Frame 4, +1601ms

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assistant

thinking

→ browser {"action":"click","x":596,"y":377,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

[Browser image supplied to model]

assistant

→ browser {"action":"motion","x":0,"y":0,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +1ms

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Frame 2, +546ms

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Frame 3, +1094ms

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Frame 4, +1644ms

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assistant

→ browser {"action":"click","x":248,"y":378,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

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assistant

→ browser {"action":"click","x":133,"y":376,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

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assistant

thinking

→ browser {"action":"click","x":1080,"y":378,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

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assistant

thinking

→ browser {"action":"inspect","x":0,"y":0,"toX":0,"toY":0,"text":"","delta":0}

toolResult

Frame 1, +0ms

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assistant

Created `index.html`. Checked step toggling, playback and playhead movement, BPM changes, stop/restart pattern retention, and Clear. The browser console showed no errors. Audible output was not independently verified.