# anthropic/claude-opus-4-0 · fresh source comparison run

The author explicitly calls this a fresh new pelican: a new same-day Opus 4 run, not a replacement for earlier Opus 4 works. Model attribution is source-reported, not independently authenticated. The date uses the response timestamp in the original log; the article publication date is recorded separately. Generation time is not independently authenticated. Original bytes archived without redrawing or improving.

- Recorded date: 2025-08-05
- Date precision: Day
- Date basis: source-reported-response-timestamp
- Model (source label): anthropic/claude-opus-4-0
- Model attribution: Source-reported, not independently authenticated
- Creator / publisher: Simon Willison
- Format: Static SVG
- Prompt category: Source-documented test
- Original prompt: Generate an SVG of a pelican riding a bicycle
- Last updated: 2026-10-01
- caseRole: case
- caseNumber: 118
- timelineVisible: True
- datePrecision: day
- dateBasis: source-reported-response-timestamp
- Original source: https://simonwillison.net/2025/Aug/5/claude-opus-41/
- Archive record: https://pelicanmap.aveniqa.com/en/specimens/simon-claude-opus4-2025-08-05/
- Rights: Works belong to their original creators. Archiving does not change their licenses.
- Media: https://pelicanmap.aveniqa.com/media/collected/2026-10-01-nile-history/simon-claude-opus4-2025-08-05.svg
  Source: https://gist.githubusercontent.com/simonw/96a958e39aaed10e1e47c1aab2d05e20/raw/21189de9bbbda140147a61ceed062174792f2ef8/4-pelican.md
- Media: https://pelicanmap.aveniqa.com/media/collected/2026-10-01-nile-history/simon-claude-opus4-2025-08-05.png
  Source: https://static.simonwillison.net/static/2025/opus-4-pelican.png