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Synthwave sunset · claude-opus-4.8

Create an animated synthwave sunset: a glowing gradient sun with scanlines setting over an infinite neon grid that scrolls toward the viewer, with a starfield and a reflected horizon.

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transcript · 4 messages
user

Create an animated synthwave sunset: a glowing gradient sun with scanlines setting over an infinite neon grid that scrolls toward the viewer, with a starfield and a reflected horizon.

assistant
thinking
I'm building a synthwave sunset animation using canvas in a single HTML file.
write /workspace/index.html (5672 bytes)
toolResult

Successfully wrote 5672 bytes to /workspace/index.html

assistant

Created `/workspace/index.html` — a self-contained animated synthwave sunset. Features: - **Glowing gradient sun** (yellow→orange→pink) with **scanlines** that widen toward the bottom, plus a soft radial glow halo - **Infinite neon grid** with cyan perspective lines converging at the horizon and magenta horizontal lines scrolling toward the viewer with easing so they bunch near the horizon - **Twinkling starfield** that fades out near the bright horizon - **Reflected horizon glow** and a shimmering sun reflection on the grid, with a bright neon horizon line Everything is inline CSS/JS in one file, no external resources. Open it in a browser to see the animation.

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

modelclaude-opus-4.8
vendorAnthropic · Claude
harnesspi-agent
generated2026-07-08

EVALUATION

4/5 working

Synthwave sunset scene with glowing sun, scanlines, neon grid, and starfield, animating on its own but unaffected by input.

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion6.4%
on click5.5%
on drag4.3%
on wheel1.6%
on enter + space0.4%
on arrow keys4.9%
on w/a/s/d6.7%
frame spread39.7 / 255
console errors0
js errors none

METRICS

runtime39.5s
tokens in3.2k
tokens out3.4k
cached4.5k
cost / run$0.1041