SpaceChem Bench: Moustachium 608

tf2_3 Hard Bonding & routing Single-reactor Australia! · SpaceChem Bench report →

Inputs: α Australium (Av), β Australium (Av). Output: ψ Moustachium 608 (Av8) ×10. Features: Bonders (4).

In SpaceChem Bench, 16 LLMs each had one attempt at this SpaceChem puzzle, with 60 minutes to build a working solution and keep optimizing it, without seeing the community archive. 3 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.

3 / 16models solved it
865best LLM cycles (156 community)
0new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles156865GPT-6.1 Sol · +454%
Reactors11GPT-6 Astra Ties record
Symbols1832GPT-6.1 Sol · +78%

Community records from the community archive when we froze it on October 18, 2026. A point counts only after fresh-game replay and SChem’s precognition check.

Pareto frontier

Pareto explorer

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Community archiveModel frontier pointNew frontier point
Select a point with the mouse or keyboard to inspect its scores and reactor blueprint.

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Every model

ModelSolvedBest cyclesBest reactorsBest symbolsNew frontier points
01GPT-6.1 SolYes865132—
02GPT-6 AstraYes1,167155—
03Gemini 4 ArgonYes1,282140—
04DeepSeek V4.1 FlashNo————
05Fable 5.1No————
06GLM-5.3No————
07GPT-6 LunaNo————
08Gemini 3.8 FlashNo————
09Grok 4.7No————
10Haiku 5.5No————
11Kimi K3.1 ProNo————
12MiMo-V2.6-ProNo————
13Muse Spark 1.3No————
14Muse Wonder 1.0No————
15Opus 5.5No————
16Sonnet 5.5No————

Best scores can come from different solutions. New frontier points are not matched or beaten on all three scores by any community solution.

Best model solutions

These solutions are in SpaceChem Community Edition export format and released under the MIT License. All of this puzzle’s model solutions are on GitHub and Hugging Face.

GPT-6.1 Sol Fewest cyclesFewest reactors

865 cycles · 1 reactor · 34 symbolstf2_3.865-1-34.txt on GitHub

Layout

α β ψ ω 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 → ↑ ↓ ← ↓ → → ↑ ← ↑ ↓ → ↓ ← ↓ ← S↓ S↑ IN α SYNC B+ B+ SYNC SYNC SYNC SYNC SYNC SYNC GRAB CW CW SYNC SYNC CW DROP OUT ψ

Running in the game

GPT-6.1 Sol solution running on tf2_3 in SpaceChem
SpaceChem Community Edition export (tf2_3.865-1-34.txt)
SOLUTION:Moustachium 608,Player,0-0-0
COMPONENT:'drag-starter-reactor',2,0,''
MEMBER:'instr-start',90,0,128,3,0,0,0
MEMBER:'instr-start',-90,0,32,2,2,0,0
MEMBER:'feature-bonder',-1,0,1,1,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,2,0,0
MEMBER:'feature-bonder',-1,0,1,0,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,0,0,0
MEMBER:'instr-arrow',0,0,64,1,1,0,0
MEMBER:'instr-arrow',-90,0,64,1,4,0,0
MEMBER:'instr-arrow',90,0,64,3,1,0,0
MEMBER:'instr-arrow',180,0,64,3,4,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-bond',-1,0,128,3,2,0,0
MEMBER:'instr-bond',-1,0,128,3,3,0,0
MEMBER:'instr-sync',-1,0,128,3,4,0,0
MEMBER:'instr-arrow',90,0,16,0,1,0,0
MEMBER:'instr-arrow',0,0,16,0,4,0,0
MEMBER:'instr-arrow',0,0,16,1,0,0,0
MEMBER:'instr-arrow',-90,0,16,1,4,0,0
MEMBER:'instr-arrow',180,0,16,2,1,0,0
MEMBER:'instr-arrow',-90,0,16,2,3,0,0
MEMBER:'instr-arrow',90,0,16,3,1,0,0
MEMBER:'instr-arrow',0,0,16,3,2,0,0
MEMBER:'instr-arrow',90,0,16,5,0,0,0
MEMBER:'instr-arrow',180,0,16,5,1,0,0
MEMBER:'instr-arrow',90,0,16,9,2,0,0
MEMBER:'instr-arrow',180,0,16,9,3,0,0
MEMBER:'instr-sync',-1,0,32,0,1,0,0
MEMBER:'instr-sync',-1,0,32,0,2,0,0
MEMBER:'instr-sync',-1,0,32,0,3,0,0
MEMBER:'instr-sync',-1,0,32,0,4,0,0
MEMBER:'instr-sync',-1,0,32,1,0,0,0
MEMBER:'instr-grab',-1,1,32,1,1,0,0
MEMBER:'instr-rotate',-1,0,32,1,2,0,0
MEMBER:'instr-rotate',-1,0,32,1,3,0,0
MEMBER:'instr-sync',-1,0,32,2,1,0,0
MEMBER:'instr-sync',-1,0,32,3,1,0,0
MEMBER:'instr-sync',-1,0,32,4,1,0,0
MEMBER:'instr-rotate',-1,0,32,5,1,0,0
MEMBER:'instr-grab',-1,2,32,9,2,0,0
MEMBER:'instr-output',-1,0,32,9,3,0,0

GPT-6.1 Sol Fewest symbols

1,440 cycles · 1 reactor · 32 symbolstf2_3.1440-1-32.txt on GitHub

Layout

α β ψ ω 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 → ← ↓ → → ↑ ← ↑ ↓ → ↓ ← ↓ ← S↓ S↑ IN α B+ B+ SYNC SYNC SYNC SYNC SYNC SYNC GRAB CW CW SYNC SYNC SYNC CW DROP OUT ψ

Running in the game

GPT-6.1 Sol solution running on tf2_3 in SpaceChem
SpaceChem Community Edition export (tf2_3.1440-1-32.txt)
SOLUTION:Moustachium 608,Player,0-0-0
COMPONENT:'drag-starter-reactor',2,0,''
MEMBER:'instr-start',90,0,128,0,6,0,0
MEMBER:'instr-start',-90,0,32,2,2,0,0
MEMBER:'feature-bonder',-1,0,1,1,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,2,0,0
MEMBER:'feature-bonder',-1,0,1,0,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,0,0,0
MEMBER:'instr-arrow',0,0,64,0,7,0,0
MEMBER:'instr-arrow',180,0,64,9,7,0,0
MEMBER:'instr-input',-1,0,128,0,7,0,0
MEMBER:'instr-bond',-1,0,128,1,7,0,0
MEMBER:'instr-bond',-1,0,128,2,7,0,0
MEMBER:'instr-sync',-1,0,128,9,7,0,0
MEMBER:'instr-arrow',90,0,16,0,1,0,0
MEMBER:'instr-arrow',0,0,16,0,4,0,0
MEMBER:'instr-arrow',0,0,16,1,0,0,0
MEMBER:'instr-arrow',-90,0,16,1,4,0,0
MEMBER:'instr-arrow',180,0,16,2,1,0,0
MEMBER:'instr-arrow',-90,0,16,2,3,0,0
MEMBER:'instr-arrow',90,0,16,3,1,0,0
MEMBER:'instr-arrow',0,0,16,3,2,0,0
MEMBER:'instr-arrow',90,0,16,5,0,0,0
MEMBER:'instr-arrow',180,0,16,5,1,0,0
MEMBER:'instr-arrow',90,0,16,9,2,0,0
MEMBER:'instr-arrow',180,0,16,9,3,0,0
MEMBER:'instr-sync',-1,0,32,0,1,0,0
MEMBER:'instr-sync',-1,0,32,0,2,0,0
MEMBER:'instr-sync',-1,0,32,0,3,0,0
MEMBER:'instr-sync',-1,0,32,0,4,0,0
MEMBER:'instr-sync',-1,0,32,1,0,0,0
MEMBER:'instr-grab',-1,1,32,1,1,0,0
MEMBER:'instr-rotate',-1,0,32,1,2,0,0
MEMBER:'instr-rotate',-1,0,32,1,3,0,0
MEMBER:'instr-sync',-1,0,32,2,1,0,0
MEMBER:'instr-sync',-1,0,32,3,1,0,0
MEMBER:'instr-sync',-1,0,32,4,1,0,0
MEMBER:'instr-rotate',-1,0,32,5,1,0,0
MEMBER:'instr-grab',-1,2,32,9,2,0,0
MEMBER:'instr-output',-1,0,32,9,3,0,0