L-system: hedge-pruned coffee shrub, by qwen3.8-max-0902
qwen3.8-max-0902 · round 2 of 2 · seed 1$0.30SVGshrub.json
shrub.json · 16 lines
{
  "axiom": "[-A][+++FF---H]S+++FF",
  "rules": {
    "S": "F[+++P][-A]S",
    "P": "FF",
    "H": "G[-G][--G]G[-G][--G]H",
    "A": "F[+B]F[-B]FA",
    "B": "F[+C][-C]FB",
    "C": "G[+D][-D]G",
    "D": "G"
  },
  "angle": 30,
  "iterations": 6,
  "start_heading": 90
}
round 1 of 2
A coffee shrub hedge-pruned flat on one side, by Qwen3.8 Max, the render after round 1
12What the model saw after each round. The picture above is the round that was scored, round 2.
gallery/A coffee shrub hedge-pruned flat on one side/Qwen3.8 Max, run 1

A coffee shrub hedge-pruned flat on one side: Qwen3.8 Max

modelqwen/qwen3.8-max-0902tasklsystem-pruned-coffee-shrub@v1, checks c2, harness h1date2026-10-03rounds2 of 8 allowed, 12 minutes on the clockcost$0.3028thinkingmediumtokens166,494 in, 26,560 out, of which 25,839 reasoningtime12 min 0 sfailedReads as a shrub: unreadable, geometry unclear, major, cause: clock, its note left no closing note

What the harness did to this run. The 12-minute clock ended it before the model finished, so this is where it had got to when time ran out.

Reads as a shrubdecided by looking · Pass if it reads as one plant with branches coming off stems, without being told what it is. A tangle, a lattice or loops fail it.fail
Flat side from the rulesdecided by looking · Pass if one side ends on a straight line that the rules themselves put there. A box drawn around the plant to cut it fails it.pass
Sensible sizedecided by looking · Pass if the branches can still be followed by eye. So many segments that they merge into a mass fails it.pass

There is no post about this one, since only some results need one, so the picture, the source and the scoring are here instead.

same prompt
same prompt, other modelsall 53 runs on A coffee shrub hedge-pruned flat on one side →
the prompt it was given
Write an L-system as JSON with the keys axiom, rules, angle, iterations and start_heading for a coffee shrub that has been hedge-pruned flat along one side. F and G draw forward, f moves without drawing, + and - turn by the angle, [ and ] save and restore position.
Frozen at v1. This model got this and nothing else.
ground truth

The JSON expanded and drawn with turtle graphics offline, and the drawing judged by eye. There is no single right L-system, so nothing here is measured. How it is scored, and this run's files on GitHub.