# 2026-07-06-qwen3-30b-gpt55-version-001

Status: complete.

## Summary

Implemented a polished self-contained GPT-5.5 upper-bound version of the Prime Spiral Visualizer. The artifact keeps the original Ulam-style prime spiral concept while adding responsive rendering, adjustable scale and limit controls, multiple color modes, orientation switching, guide overlays, statistics, and pointer-based integer inspection.

## Artifact

Entry point: `artifact/index.html`.

## Usage Notes

- Open `artifact/index.html` in a browser.
- Use the controls to change the integer limit, cell size, zoom, palette, spiral orientation, and visual guides.
- Move over the canvas to inspect the integer at a coordinate; click to pin a highlighted point.
- The "Surprise view" button chooses a new combination of local settings without using network resources.

## What GPT-5.5 Changed

- Replaced repeated trial-division and `includes()` checks with a sieve-backed prime table and indexed lookup.
- Added a richer visual presentation with responsive canvas sizing, high-DPI rendering, ring/axis/grid guides, and color palettes that reveal different prime-distribution structure.
- Added real interactions beyond deterministic redraw: parameter controls, live stats, hover inspection, click-to-pin highlighting, and randomized local views.
- Kept the artifact as a single HTML/CSS/JS file with no external URLs, CDNs, remote APIs, `fetch()`, web fonts, or external images.

## Remaining Limitations

- The visualizer is intentionally browser-only and recalculates primes on each parameter change; very old devices may render the highest limit more slowly.
- It focuses on visual exploration rather than formal number-theory analysis or exporting images/data.