# Claude Opus 5.5 · medium / high / xhigh animation comparison

The author ran the same HTML-animation brief in fresh sessions at Opus 5.5 medium, high and xhigh and recorded the comparison: roughly 4, 3 and 7 minutes respectively. A later three-prompt refinement in the medium session produced a more detailed white pelican, road bike and depth-filled scene. The author notes that this is a single sample from a personal agent harness, not a controlled evaluation.

- Recorded date: 2026-09-27
- Creator / publisher: Kylmawurr (Reddit)
- Format: Video
- Prompt category: animated-html
- Original prompt: Write HTML code that displays a 2D animation of a pelican riding a bicycle using SVG graphics. No additional testing is required.
- Last updated: 2026-09-30
- Original source: https://www.reddit.com/r/claude/comments/1wrdd57/classic_pelican_on_a_bicycle_test_with_opus_55_at/
- Archive record: https://pelicanmap.aveniqa.com/en/specimens/reddit-kylmawurr-claude-opus-5-5-2026-09-27/
- Rights: Works belong to their original creators. Archiving does not change their licenses.
- Media: https://pelicanmap.aveniqa.com/media/recovered/reddit-kylmawurr-opus-5-5-comparison.mp4
  Source: https://v.redd.it/w5z3k621h0sh1