SpaceChem Bench: Challenge: Going Green

sensing_6 Medium Multi-reactor production Multi-reactor Alkonost Random inputs · SpaceChem Bench report →

Random inputs: α Carbon Dioxide (CO2) / Hydrogen Sulfide (H2S). Output: ψ Sulfuric Acid (H2SO4) ×10, ω Carbon (C) ×10. Features: Max reactors: 5, Random inputs.

In SpaceChem Bench, 16 LLMs each had one attempt at this SpaceChem puzzle, with 40 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
1,609best LLM cycles (1,219 community)
0new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles1,2191,609Gemini 4 Argon · +32%
Reactors12GPT-6.1 Sol · +100%
Symbols3549Gemini 4 Argon · +40%

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
01Gemini 4 ArgonYes1,609249—
02GPT-6.1 SolYes3,338263—
03GPT-6 AstraYes4,541396—
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.

Gemini 4 Argon Fewest cycles

1,609 cycles · 3 reactors · 65 symbolssensing_6.1609-3-65.txt on GitHub

Layout (Reactor 1 of 3)

α β ψ ω 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 → ↑ ↓ ← → ↑ ↓ ← ← ↑ S← S← G/D IN α SYNC G/D G/D SYNC OUT ω ?O↓ G/D G/D OUT ψ

Running in the game

Gemini 4 Argon solution running on sensing_6 in SpaceChem
SpaceChem Community Edition export (sensing_6.1609-3-65.txt)
SOLUTION:Challenge: Going Green,Player,0-0-0
COMPONENT:'drag-advanced-reactor',9,5,''
MEMBER:'instr-start',180,0,128,2,2,0,0
MEMBER:'instr-start',180,0,32,5,2,0,0
MEMBER:'feature-sensor',-1,0,1,6,1,0,0
MEMBER:'feature-bonder',-1,0,1,0,7,0,0
MEMBER:'feature-bonder',-1,0,1,9,7,0,0
MEMBER:'feature-bonder',-1,0,1,4,7,0,0
MEMBER:'feature-bonder',-1,0,1,6,7,0,0
MEMBER:'instr-arrow',0,0,64,1,1,0,0
MEMBER:'instr-arrow',-90,0,64,1,2,0,0
MEMBER:'instr-arrow',90,0,64,4,1,0,0
MEMBER:'instr-arrow',180,0,64,4,2,0,0
MEMBER:'instr-grab',-1,0,128,1,1,0,0
MEMBER:'instr-input',-1,0,128,1,2,0,0
MEMBER:'instr-sync',-1,0,128,3,2,0,0
MEMBER:'instr-grab',-1,0,128,4,1,0,0
MEMBER:'instr-arrow',0,0,16,4,1,0,0
MEMBER:'instr-arrow',-90,0,16,4,2,0,0
MEMBER:'instr-arrow',90,0,16,8,1,0,0
MEMBER:'instr-arrow',180,0,16,8,2,0,0
MEMBER:'instr-grab',-1,0,32,4,1,0,0
MEMBER:'instr-sync',-1,0,32,4,2,0,0
MEMBER:'instr-output',-1,1,32,5,4,0,0
MEMBER:'instr-sensor',90,0,32,6,1,0,8
MEMBER:'instr-grab',-1,0,32,6,4,0,0
MEMBER:'instr-grab',-1,0,32,8,1,0,0
MEMBER:'instr-output',-1,0,32,8,2,0,0
MEMBER:'instr-arrow',180,0,16,6,4,0,0
MEMBER:'instr-arrow',-90,0,16,4,4,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,6,1
PIPE:0,6,0
PIPE:0,6,-1
PIPE:0,6,-2
PIPE:0,7,-2
PIPE:1,4,2
PIPE:1,5,2
PIPE:1,6,2
PIPE:1,6,3
PIPE:1,6,4
COMPONENT:'drag-advanced-reactor',16,8,''
MEMBER:'instr-start',180,0,128,2,1,0,0
MEMBER:'instr-start',-90,0,32,6,2,0,0
MEMBER:'feature-bonder',-1,0,1,5,0,0,0
MEMBER:'feature-bonder',-1,0,1,6,0,0,0
MEMBER:'feature-bonder',-1,0,1,7,0,0,0
MEMBER:'feature-bonder',-1,0,1,8,0,0,0
MEMBER:'feature-sensor',-1,0,1,0,7,0,0
MEMBER:'instr-arrow',0,0,64,1,0,0,0
MEMBER:'instr-arrow',-90,0,64,1,1,0,0
MEMBER:'instr-arrow',90,0,64,7,0,0,0
MEMBER:'instr-arrow',180,0,64,7,1,0,0
MEMBER:'instr-grab',-1,0,128,1,0,0,0
MEMBER:'instr-input',-1,0,128,1,1,0,0
MEMBER:'instr-grab',-1,0,128,5,1,0,0
MEMBER:'instr-bond',-1,1,128,6,0,0,0
MEMBER:'instr-bond',-1,1,128,7,0,0,0
MEMBER:'instr-output',-1,0,128,7,1,0,0
MEMBER:'instr-arrow',90,0,16,5,1,0,0
MEMBER:'instr-arrow',0,0,16,5,4,0,0
MEMBER:'instr-arrow',180,0,16,6,1,0,0
MEMBER:'instr-arrow',-90,0,16,6,4,0,0
MEMBER:'instr-grab',-1,1,32,5,1,0,0
MEMBER:'instr-output',-1,1,32,6,3,0,0
MEMBER:'instr-grab',-1,0,32,6,4,0,0
PIPE:0,4,1
PIPE:0,4,0
PIPE:0,4,-1
PIPE:0,4,-2
PIPE:0,3,-2
PIPE:0,2,-2
PIPE:0,1,-2
PIPE:0,0,-2
PIPE:0,0,-3
PIPE:0,0,-4
PIPE:1,4,2
PIPE:1,5,2
PIPE:1,6,2
PIPE:1,6,3
PIPE:1,6,4
PIPE:1,6,5
PIPE:1,6,6
PIPE:1,6,7
PIPE:1,6,8
PIPE:1,6,9
PIPE:1,6,10
PIPE:1,6,11
COMPONENT:'drag-powerplant-input',-7,4,''
PIPE:0,14,7
PIPE:0,14,6
PIPE:0,14,5
PIPE:0,14,4
PIPE:0,14,3
PIPE:0,14,2
PIPE:0,15,2
COMPONENT:'drag-advanced-reactor',17,2,''
MEMBER:'instr-start',180,0,128,6,2,0,0
MEMBER:'instr-start',-90,0,32,6,7,0,0
MEMBER:'feature-bonder',-1,0,1,0,4,0,0
MEMBER:'feature-bonder',-1,0,1,1,4,0,0
MEMBER:'feature-bonder',-1,0,1,2,4,0,0
MEMBER:'feature-bonder',-1,0,1,3,4,0,0
MEMBER:'feature-sensor',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',90,0,64,1,4,0,0
MEMBER:'instr-arrow',0,0,64,1,5,0,0
MEMBER:'instr-arrow',90,0,64,2,2,0,0
MEMBER:'instr-arrow',180,0,64,2,4,0,0
MEMBER:'instr-arrow',0,0,64,4,1,0,0
MEMBER:'instr-arrow',-90,0,64,4,5,0,0
MEMBER:'instr-arrow',90,0,64,7,1,0,0
MEMBER:'instr-arrow',180,0,64,7,2,0,0
MEMBER:'instr-sync',-1,0,128,1,4,0,0
MEMBER:'instr-grab',-1,1,128,2,2,0,0
MEMBER:'instr-sync',-1,0,128,2,3,0,0
MEMBER:'instr-bond',-1,1,128,2,4,0,0
MEMBER:'instr-rotate',-1,0,128,3,2,0,0
MEMBER:'instr-sensor',180,0,128,4,2,0,1
MEMBER:'instr-input',-1,0,128,5,2,0,0
MEMBER:'instr-grab',-1,0,128,7,1,0,0
MEMBER:'instr-output',-1,0,128,7,2,0,0
MEMBER:'instr-arrow',90,0,16,2,6,0,0
MEMBER:'instr-arrow',0,0,16,2,7,0,0
MEMBER:'instr-arrow',180,0,16,6,6,0,0
MEMBER:'instr-arrow',-90,0,16,6,7,0,0
MEMBER:'instr-bond',-1,0,32,2,6,0,0
MEMBER:'instr-sync',-1,0,32,2,7,0,0
MEMBER:'instr-bond',-1,0,32,3,6,0,0
MEMBER:'instr-input',-1,1,32,4,6,0,0
MEMBER:'instr-input',-1,1,32,5,6,0,0
MEMBER:'instr-sync',-1,0,32,6,6,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:1,4,2

Gemini 4 Argon Fewest reactors

2,597 cycles · 2 reactors · 50 symbolssensing_6.2597-2-50.txt on GitHub

Layout (Reactor 1 of 2)

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 GRAB B− B− OUT ω G/D ?O↓ OUT ψ IN α G/D OUT ω

Running in the game

Gemini 4 Argon solution running on sensing_6 in SpaceChem
SpaceChem Community Edition export (sensing_6.2597-2-50.txt)
SOLUTION:Challenge: Going Green,Player,0-0-0
COMPONENT:'drag-advanced-reactor',9,5,''
MEMBER:'instr-start',-90,0,128,1,5,0,0
MEMBER:'instr-start',0,0,32,3,5,0,0
MEMBER:'feature-bonder',-1,0,1,5,4,0,0
MEMBER:'feature-bonder',-1,0,1,6,4,0,0
MEMBER:'feature-bonder',-1,0,1,7,4,0,0
MEMBER:'feature-bonder',-1,0,1,8,4,0,0
MEMBER:'feature-sensor',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',0,0,64,1,1,0,0
MEMBER:'instr-arrow',0,0,64,5,4,0,0
MEMBER:'instr-arrow',90,0,64,7,4,0,0
MEMBER:'instr-grab',-1,1,128,1,2,0,0
MEMBER:'instr-grab',-1,1,128,2,1,0,0
MEMBER:'instr-bond',-1,1,128,6,4,0,0
MEMBER:'instr-bond',-1,1,128,7,4,0,0
MEMBER:'instr-output',-1,1,128,7,5,0,0
MEMBER:'instr-grab',-1,0,128,8,2,0,0
MEMBER:'instr-sensor',90,0,128,5,1,0,8
MEMBER:'instr-arrow',90,0,64,8,1,0,0
MEMBER:'instr-output',-1,0,128,8,3,0,0
MEMBER:'instr-input',-1,0,128,1,3,0,0
MEMBER:'instr-arrow',180,0,64,8,3,0,0
MEMBER:'instr-arrow',-90,0,64,1,3,0,0
MEMBER:'instr-arrow',180,0,64,7,6,0,0
MEMBER:'instr-grab',-1,0,128,6,6,0,0
MEMBER:'instr-output',-1,1,128,5,6,0,0
MEMBER:'instr-arrow',-90,0,64,1,6,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,6,1
PIPE:0,6,0
PIPE:0,6,-1
PIPE:0,7,-1
PIPE:1,4,2
PIPE:1,5,2
PIPE:1,5,3
PIPE:1,5,4
PIPE:1,6,4
PIPE:1,6,5
PIPE:1,7,5
PIPE:1,7,6
PIPE:1,7,7
PIPE:1,7,8
PIPE:1,7,9
PIPE:1,7,10
PIPE:1,8,10
PIPE:1,8,9
PIPE:1,8,8
PIPE:1,8,7
PIPE:1,8,6
PIPE:1,8,5
PIPE:1,8,4
PIPE:1,8,3
PIPE:1,8,2
PIPE:1,7,2
PIPE:1,7,1
PIPE:1,7,0
COMPONENT:'drag-advanced-reactor',17,3,''
MEMBER:'instr-start',180,0,128,6,2,0,0
MEMBER:'instr-start',180,0,32,8,7,0,0
MEMBER:'feature-bonder',-1,0,1,0,4,0,0
MEMBER:'feature-bonder',-1,0,1,1,4,0,0
MEMBER:'feature-bonder',-1,0,1,2,4,0,0
MEMBER:'feature-bonder',-1,0,1,3,4,0,0
MEMBER:'feature-sensor',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',90,0,64,1,4,0,0
MEMBER:'instr-arrow',0,0,64,1,5,0,0
MEMBER:'instr-arrow',90,0,64,2,2,0,0
MEMBER:'instr-arrow',180,0,64,2,4,0,0
MEMBER:'instr-arrow',0,0,64,4,1,0,0
MEMBER:'instr-arrow',-90,0,64,4,5,0,0
MEMBER:'instr-arrow',90,0,64,7,1,0,0
MEMBER:'instr-arrow',180,0,64,7,2,0,0
MEMBER:'instr-sync',-1,0,128,1,4,0,0
MEMBER:'instr-grab',-1,1,128,2,2,0,0
MEMBER:'instr-sync',-1,0,128,2,3,0,0
MEMBER:'instr-bond',-1,1,128,2,4,0,0
MEMBER:'instr-rotate',-1,0,128,3,2,0,0
MEMBER:'instr-sensor',180,0,128,4,2,0,1
MEMBER:'instr-input',-1,0,128,5,2,0,0
MEMBER:'instr-grab',-1,0,128,7,1,0,0
MEMBER:'instr-output',-1,0,128,7,2,0,0
MEMBER:'instr-arrow',90,0,16,0,6,0,0
MEMBER:'instr-arrow',0,0,16,0,7,0,0
MEMBER:'instr-arrow',180,0,16,7,6,0,0
MEMBER:'instr-arrow',-90,0,16,7,7,0,0
MEMBER:'instr-grab',-1,0,32,0,6,0,0
MEMBER:'instr-input',-1,1,32,1,6,0,0
MEMBER:'instr-sync',-1,0,32,2,6,0,0
MEMBER:'instr-bond',-1,0,32,3,6,0,0
MEMBER:'instr-bond',-1,0,32,4,6,0,0
MEMBER:'instr-input',-1,1,32,5,6,0,0
MEMBER:'instr-input',-1,1,32,6,6,0,0
MEMBER:'instr-grab',-1,0,32,6,7,0,0
MEMBER:'instr-sync',-1,0,32,7,6,0,0
MEMBER:'instr-output',-1,1,32,7,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,0
PIPE:1,4,2
PIPE:1,5,2
PIPE:1,5,3
PIPE:1,5,4
PIPE:1,5,5
PIPE:1,5,6
PIPE:1,5,7
PIPE:1,5,8
PIPE:1,5,9
PIPE:1,5,10
PIPE:1,5,11
PIPE:1,5,12
PIPE:1,5,13
PIPE:1,5,14
PIPE:1,5,15
PIPE:1,5,16
COMPONENT:'drag-powerplant-input',-7,4,''
PIPE:0,14,7
PIPE:0,14,6
PIPE:0,14,5
PIPE:0,14,4
PIPE:0,14,3
PIPE:0,14,2
PIPE:0,15,2

Gemini 4 Argon Fewest symbols

2,837 cycles · 2 reactors · 49 symbolssensing_6.2837-2-49.txt on GitHub

Layout (Reactor 1 of 2)

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 GRAB B− B− OUT ω G/D ?O↓ G/D OUT ω OUT ψ IN α

Running in the game

Gemini 4 Argon solution running on sensing_6 in SpaceChem
SpaceChem Community Edition export (sensing_6.2837-2-49.txt)
SOLUTION:Challenge: Going Green,Player,0-0-0
COMPONENT:'drag-advanced-reactor',9,5,''
MEMBER:'instr-start',-90,0,128,1,5,0,0
MEMBER:'instr-start',0,0,32,3,5,0,0
MEMBER:'feature-bonder',-1,0,1,5,4,0,0
MEMBER:'feature-bonder',-1,0,1,6,4,0,0
MEMBER:'feature-bonder',-1,0,1,7,4,0,0
MEMBER:'feature-bonder',-1,0,1,8,4,0,0
MEMBER:'feature-sensor',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',0,0,64,1,1,0,0
MEMBER:'instr-arrow',0,0,64,5,4,0,0
MEMBER:'instr-arrow',90,0,64,7,4,0,0
MEMBER:'instr-grab',-1,1,128,1,2,0,0
MEMBER:'instr-grab',-1,1,128,2,1,0,0
MEMBER:'instr-bond',-1,1,128,6,4,0,0
MEMBER:'instr-bond',-1,1,128,7,4,0,0
MEMBER:'instr-output',-1,1,128,7,5,0,0
MEMBER:'instr-grab',-1,0,128,8,2,0,0
MEMBER:'instr-sensor',90,0,128,5,1,0,8
MEMBER:'instr-arrow',90,0,64,8,1,0,0
MEMBER:'instr-arrow',180,0,64,7,6,0,0
MEMBER:'instr-grab',-1,0,128,6,6,0,0
MEMBER:'instr-output',-1,1,128,5,6,0,0
MEMBER:'instr-arrow',-90,0,64,1,6,0,0
MEMBER:'instr-output',-1,0,128,8,3,0,0
MEMBER:'instr-input',-1,0,128,1,3,0,0
MEMBER:'instr-arrow',180,0,64,8,6,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,6,1
PIPE:0,6,0
PIPE:0,6,-1
PIPE:0,7,-1
PIPE:1,4,2
PIPE:1,5,2
PIPE:1,5,3
PIPE:1,5,4
PIPE:1,6,4
PIPE:1,6,5
PIPE:1,7,5
PIPE:1,7,6
PIPE:1,7,7
PIPE:1,7,8
PIPE:1,7,9
PIPE:1,7,10
PIPE:1,8,10
PIPE:1,8,9
PIPE:1,8,8
PIPE:1,8,7
PIPE:1,8,6
PIPE:1,8,5
PIPE:1,8,4
PIPE:1,8,3
PIPE:1,8,2
PIPE:1,7,2
PIPE:1,7,1
PIPE:1,7,0
COMPONENT:'drag-advanced-reactor',17,3,''
MEMBER:'instr-start',180,0,128,6,2,0,0
MEMBER:'instr-start',180,0,32,8,7,0,0
MEMBER:'feature-bonder',-1,0,1,0,4,0,0
MEMBER:'feature-bonder',-1,0,1,1,4,0,0
MEMBER:'feature-bonder',-1,0,1,2,4,0,0
MEMBER:'feature-bonder',-1,0,1,3,4,0,0
MEMBER:'feature-sensor',-1,0,1,4,1,0,0
MEMBER:'instr-arrow',90,0,64,1,4,0,0
MEMBER:'instr-arrow',0,0,64,1,5,0,0
MEMBER:'instr-arrow',90,0,64,2,2,0,0
MEMBER:'instr-arrow',180,0,64,2,4,0,0
MEMBER:'instr-arrow',0,0,64,4,1,0,0
MEMBER:'instr-arrow',-90,0,64,4,5,0,0
MEMBER:'instr-arrow',90,0,64,7,1,0,0
MEMBER:'instr-arrow',180,0,64,7,2,0,0
MEMBER:'instr-sync',-1,0,128,1,4,0,0
MEMBER:'instr-grab',-1,1,128,2,2,0,0
MEMBER:'instr-sync',-1,0,128,2,3,0,0
MEMBER:'instr-bond',-1,1,128,2,4,0,0
MEMBER:'instr-rotate',-1,0,128,3,2,0,0
MEMBER:'instr-sensor',180,0,128,4,2,0,1
MEMBER:'instr-input',-1,0,128,5,2,0,0
MEMBER:'instr-grab',-1,0,128,7,1,0,0
MEMBER:'instr-output',-1,0,128,7,2,0,0
MEMBER:'instr-arrow',90,0,16,0,6,0,0
MEMBER:'instr-arrow',0,0,16,0,7,0,0
MEMBER:'instr-arrow',180,0,16,7,6,0,0
MEMBER:'instr-arrow',-90,0,16,7,7,0,0
MEMBER:'instr-grab',-1,0,32,0,6,0,0
MEMBER:'instr-input',-1,1,32,1,6,0,0
MEMBER:'instr-sync',-1,0,32,2,6,0,0
MEMBER:'instr-bond',-1,0,32,3,6,0,0
MEMBER:'instr-bond',-1,0,32,4,6,0,0
MEMBER:'instr-input',-1,1,32,5,6,0,0
MEMBER:'instr-input',-1,1,32,6,6,0,0
MEMBER:'instr-grab',-1,0,32,6,7,0,0
MEMBER:'instr-sync',-1,0,32,7,6,0,0
MEMBER:'instr-output',-1,1,32,7,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,0
PIPE:1,4,2
PIPE:1,5,2
PIPE:1,5,3
PIPE:1,5,4
PIPE:1,5,5
PIPE:1,5,6
PIPE:1,5,7
PIPE:1,5,8
PIPE:1,5,9
PIPE:1,5,10
PIPE:1,5,11
PIPE:1,5,12
PIPE:1,5,13
PIPE:1,5,14
PIPE:1,5,15
PIPE:1,5,16
COMPONENT:'drag-powerplant-input',-7,4,''
PIPE:0,14,7
PIPE:0,14,6
PIPE:0,14,5
PIPE:0,14,4
PIPE:0,14,3
PIPE:0,14,2
PIPE:0,15,2