SpaceChem Bench: Double Bonds

research_tutorial_4 Easy Bonding & routing Single-reactor Sernimir IV · SpaceChem Bench report →

Inputs: α Oxygen (O). Output: ψ Oxygen (O2) ×10. Features: Bonders (4).

In SpaceChem Bench, 16 LLMs each had one attempt at this SpaceChem puzzle, with 10 minutes to build a working solution and keep optimizing it, without seeing the community archive. 13 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.

13 / 16models solved it
74best LLM cycles (56 community)
0new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles5674GPT-6 Astra · +32%
Reactors11DeepSeek V4.1 Flash Ties record
Symbols79GPT-6 Astra · +29%

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

Lower is better ↙
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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.

Search over time

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Every model

ModelSolvedBest cyclesBest reactorsBest symbolsNew frontier points
01GPT-6 AstraYes7419—
02Gemini 3.8 FlashYes99112—
03GPT-6.1 SolYes100110—
04Opus 5.5Yes103111—
05Fable 5.1Yes104114—
06Sonnet 5.5Yes105115—
07Gemini 4 ArgonYes118111—
08Muse Spark 1.3Yes138117—
09Kimi K3.1 ProYes212123—
10DeepSeek V4.1 FlashYes239147—
11Haiku 5.5Yes265128—
12Grok 4.7Yes398128—
13Muse Wonder 1.0Yes438135—
14GLM-5.3No————
15GPT-6 LunaNo————
16MiMo-V2.6-ProNo————

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 Astra Fewest cyclesFewest reactors

74 cycles · 1 reactor · 15 symbolsresearch_tutorial_4.74-1-15.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← B+ S→ GRAB GRAB IN α B+ IN α B+ OUT ψ OUT ψ DROP DROP

Running in the game

GPT-6 Astra solution running on research_tutorial_4 in SpaceChem
SpaceChem Community Edition export (research_tutorial_4.74-1-15.txt)
SOLUTION:Double Bonds,Player,0-0-0
COMPONENT:'drag-starter-reactor',2,0,''
MEMBER:'instr-start',180,0,128,3,1,0,0
MEMBER:'instr-start',0,0,32,4,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,1,0,0
MEMBER:'feature-bonder',-1,0,1,2,1,0,0
MEMBER:'feature-bonder',-1,0,1,3,1,0,0
MEMBER:'feature-bonder',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',0,0,64,0,1,0,0
MEMBER:'instr-arrow',180,0,64,7,1,0,0
MEMBER:'instr-grab',-1,1,128,1,1,0,0
MEMBER:'instr-input',-1,0,128,2,1,0,0
MEMBER:'instr-input',-1,0,128,5,1,0,0
MEMBER:'instr-output',-1,0,128,6,1,0,0
MEMBER:'instr-grab',-1,2,128,7,1,0,0
MEMBER:'instr-arrow',0,0,16,0,1,0,0
MEMBER:'instr-arrow',180,0,16,7,1,0,0
MEMBER:'instr-grab',-1,1,32,1,1,0,0
MEMBER:'instr-bond',-1,0,32,2,1,0,0
MEMBER:'instr-bond',-1,0,32,3,1,0,0
MEMBER:'instr-bond',-1,0,32,5,1,0,0
MEMBER:'instr-output',-1,0,32,6,1,0,0
MEMBER:'instr-grab',-1,2,32,7,1,0,0

GPT-6 Astra Fewest symbols

138 cycles · 1 reactor · 9 symbolsresearch_tutorial_4.138-1-9.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→ GRAB IN α OUT ψ DROP B+

Running in the game

GPT-6 Astra solution running on research_tutorial_4 in SpaceChem
SpaceChem Community Edition export (research_tutorial_4.138-1-9.txt)
SOLUTION:Double Bonds,Player,0-0-0
COMPONENT:'drag-starter-reactor',2,0,''
MEMBER:'instr-start',180,0,128,3,1,0,0
MEMBER:'instr-start',0,0,32,0,5,0,0
MEMBER:'feature-bonder',-1,0,1,1,1,0,0
MEMBER:'feature-bonder',-1,0,1,2,1,0,0
MEMBER:'feature-bonder',-1,0,1,3,1,0,0
MEMBER:'feature-bonder',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',0,0,64,0,1,0,0
MEMBER:'instr-arrow',180,0,64,7,1,0,0
MEMBER:'instr-grab',-1,1,128,1,1,0,0
MEMBER:'instr-input',-1,0,128,2,1,0,0
MEMBER:'instr-output',-1,0,128,5,1,0,0
MEMBER:'instr-grab',-1,2,128,7,1,0,0
MEMBER:'instr-arrow',0,0,16,0,5,0,0
MEMBER:'instr-arrow',180,0,16,1,5,0,0
MEMBER:'instr-bond',-1,0,32,1,5,0,0