Claude Opus Draws Photo-Realistic Images Stroke by Stroke via Agent Sketchbook
On September 25–26, developer Riley Ralmuto posted a series of demos showing his custom tool "agent sketchbook" letting Claude Opus paint nearly photo-realistic images stroke by stroke, repeatedly emphasizing "this is not a photo." After authenticity doubts arose, AI-detection firm Pangram confirmed the images were AI-generated, and the demo went viral.
Confirmed
- agent sketchbook is a custom drawing engine built for AI agents, not an official Anthropic product; the model controls every stroke's position, pressure, and brush/pen/pencil angle—the closest an agent can get to hand drawing
- Opus correctly rendered hard details like iridescence and dew drops, with one work reportedly comprising 45,000 strokes
- Pangram tested the image amid skepticism and judged it AI-generated
- Opus 5.5 drew a graphite sketch of a Feathered Thorn moth with detailed painter's notes and accurate details of the moth escaping a spider web
- The demo went viral; even Grok wrote an intro the author endorsed
Why it matters
- It demonstrates LLM agents' capacity for long-horizon fine motor control, exceeding typical text-to-image models
- The work both fools humans and is correctly flagged by Pangram, becoming a real-world case for debates on detecting stroke-generated AI images
2026-09-25 ~ 2026-09-26 · 7 related posts
Primary sources
- Claude Opus draws shockingly realistic image with 45,000 strokes via agent sketchbook — RileyRalmuto ·
- Claude Opus hand-drew art via agent sketchbook — and AI detectors correctly passed it — pangram ·
- Claude Opus draws photorealistic image stroke-by-stroke via agent sketchbook, nailing iridescence and dew — RileyRalmuto ·
- [source] Claude Opus draws shockingly realistic image with 45,000 strokes via agent sketchbook — RileyRalmuto · 2026-09-25
- Opus draws a photorealistic image via agent sketchbook — 'this is not a photograph' — RileyRalmuto · 2026-09-25
- [source] Claude Opus draws photorealistic image stroke-by-stroke via agent sketchbook, nailing iridescence and dew — RileyRalmuto · 2026-09-25
- Opus 5.5 draws a graphite moth stroke-by-stroke via agent sketchbook, stunning its creator — RileyRalmuto · 2026-09-25
- Agent Sketchbook lets Claude draw stroke-by-stroke, viral spider-web image wows AI circles — RileyRalmuto · 2026-09-26
- [source] Claude Opus hand-drew art via agent sketchbook — and AI detectors correctly passed it — pangram · 2026-09-26
1 near-duplicate retellings: VoidStateKate