SpaceChem Bench: Danger Zone

mining_1 Medium Sensing Single-reactor Hephaestus IV Random inputs · SpaceChem Bench report →

Random inputs: α Hydrogen (H) / Hydrogen (H2). Output: ψ Hydrogen (H2) ×20. Features: Bonders (4), Sensor, 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. 14 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.

14 / 16models solved it
220best LLM cycles (154 community)
0new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles154220Gemini 4 Argon · +43%
Reactors11DeepSeek V4.1 Flash Ties record
Symbols1013Gemini 4 Argon · +30%

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 ArgonYes220113—
02Opus 5.5Yes222113—
03GPT-6.1 SolYes246124—
04Fable 5.1Yes249121—
05GPT-6 AstraYes259117—
06Sonnet 5.5Yes277129—
07Gemini 3.8 FlashYes295128—
08Kimi K3.1 ProYes296121—
09Haiku 5.5Yes340138—
10Muse Wonder 1.0Yes400119—
11GPT-6 LunaYes430121—
12DeepSeek V4.1 FlashYes544120—
13GLM-5.3Yes584142—
14Muse Spark 1.3Yes585139—
15Grok 4.7No————
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.

Gemini 4 Argon Fewest cycles

220 cycles · 1 reactor · 28 symbolsmining_1.220-1-28.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→ G/D G/D ?H→ ?H→ IN α IN α B+ B+ G/D G/D GRAB GRAB OUT ψ OUT ψ DROP DROP

Running in the game

Gemini 4 Argon solution running on mining_1 in SpaceChem
SpaceChem Community Edition export (mining_1.220-1-28.txt)
SOLUTION:Danger Zone,Player,0-0-0
COMPONENT:'drag-advanced-reactor',2,0,''
MEMBER:'instr-start',180,0,128,3,1,0,0
MEMBER:'instr-start',0,0,32,6,3,0,0
MEMBER:'feature-bonder',-1,0,1,2,3,0,0
MEMBER:'feature-bonder',-1,0,1,3,3,0,0
MEMBER:'feature-bonder',-1,0,1,0,7,0,0
MEMBER:'feature-bonder',-1,0,1,1,7,0,0
MEMBER:'feature-sensor',-1,0,1,2,2,0,0
MEMBER:'instr-arrow',90,0,64,1,1,0,0
MEMBER:'instr-arrow',0,0,64,1,3,0,0
MEMBER:'instr-arrow',180,0,64,7,1,0,0
MEMBER:'instr-arrow',-90,0,64,7,3,0,0
MEMBER:'instr-grab',-1,0,128,1,1,0,0
MEMBER:'instr-sensor',0,0,128,1,2,0,1
MEMBER:'instr-input',-1,0,128,2,1,0,0
MEMBER:'instr-bond',-1,0,128,2,3,0,0
MEMBER:'instr-grab',-1,0,128,3,3,0,0
MEMBER:'instr-grab',-1,1,128,4,3,0,0
MEMBER:'instr-output',-1,0,128,7,1,0,0
MEMBER:'instr-grab',-1,2,128,7,2,0,0
MEMBER:'instr-arrow',90,0,16,1,1,0,0
MEMBER:'instr-arrow',0,0,16,1,3,0,0
MEMBER:'instr-arrow',180,0,16,7,1,0,0
MEMBER:'instr-arrow',-90,0,16,7,3,0,0
MEMBER:'instr-grab',-1,0,32,1,1,0,0
MEMBER:'instr-sensor',0,0,32,1,2,0,1
MEMBER:'instr-input',-1,0,32,2,1,0,0
MEMBER:'instr-bond',-1,0,32,2,3,0,0
MEMBER:'instr-grab',-1,0,32,3,3,0,0
MEMBER:'instr-grab',-1,1,32,4,3,0,0
MEMBER:'instr-output',-1,0,32,7,1,0,0
MEMBER:'instr-grab',-1,2,32,7,2,0,0
MEMBER:'instr-arrow',90,0,64,6,2,0,0
MEMBER:'instr-arrow',0,0,64,6,3,0,0
MEMBER:'instr-arrow',90,0,16,6,2,0,0
MEMBER:'instr-arrow',0,0,16,6,3,0,0

Opus 5.5 Fewest reactors

222 cycles · 1 reactor · 22 symbolsmining_1.222-1-22.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← B+ GRAB DROP IN α DROP GRAB GRAB OUT ψ DROP ?H↑ GRAB

Running in the game

Opus 5.5 solution running on mining_1 in SpaceChem
SpaceChem Community Edition export (mining_1.222-1-22.txt)
SOLUTION:Danger Zone,Player,0-0-0
COMPONENT:'drag-advanced-reactor',2,0,''
MEMBER:'instr-start',180,0,128,5,2,0,0
MEMBER:'instr-start',180,0,32,5,0,0,0
MEMBER:'feature-bonder',-1,0,1,2,0,0,0
MEMBER:'feature-bonder',-1,0,1,3,0,0,0
MEMBER:'feature-sensor',-1,0,1,2,1,0,0
MEMBER:'feature-bonder',-1,0,1,0,7,0,0
MEMBER:'feature-bonder',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,1,0,0,0
MEMBER:'instr-arrow',-90,0,64,1,2,0,0
MEMBER:'instr-arrow',0,0,64,2,1,0,0
MEMBER:'instr-arrow',90,0,64,3,0,0,0
MEMBER:'instr-arrow',180,0,64,3,2,0,0
MEMBER:'instr-arrow',90,0,64,5,1,0,0
MEMBER:'instr-arrow',180,0,64,5,2,0,0
MEMBER:'instr-bond',-1,0,128,2,0,0,0
MEMBER:'instr-grab',-1,1,128,2,1,0,0
MEMBER:'instr-grab',-1,2,128,3,0,0,0
MEMBER:'instr-input',-1,0,128,3,2,0,0
MEMBER:'instr-grab',-1,2,128,5,1,0,0
MEMBER:'instr-arrow',90,0,16,4,0,0,0
MEMBER:'instr-arrow',0,0,16,4,1,0,0
MEMBER:'instr-arrow',180,0,16,7,0,0,0
MEMBER:'instr-arrow',-90,0,16,7,1,0,0
MEMBER:'instr-grab',-1,1,32,4,0,0,0
MEMBER:'instr-grab',-1,1,32,5,1,0,0
MEMBER:'instr-output',-1,0,32,7,0,0,0
MEMBER:'instr-grab',-1,2,32,7,1,0,0
MEMBER:'instr-sensor',-90,0,128,2,2,0,1
MEMBER:'instr-grab',-1,1,128,1,1,0,0

Gemini 4 Argon Fewest symbols

399 cycles · 1 reactor · 13 symbolsmining_1.399-1-13.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← G/D ?H→ B+ G/D GRAB IN α OUT ψ DROP

Running in the game

Gemini 4 Argon solution running on mining_1 in SpaceChem
SpaceChem Community Edition export (mining_1.399-1-13.txt)
SOLUTION:Danger Zone,Player,0-0-0
COMPONENT:'drag-advanced-reactor',2,0,''
MEMBER:'instr-start',180,0,128,3,1,0,0
MEMBER:'instr-start',180,0,32,4,6,0,0
MEMBER:'feature-bonder',-1,0,1,1,3,0,0
MEMBER:'feature-bonder',-1,0,1,1,4,0,0
MEMBER:'feature-bonder',-1,0,1,0,7,0,0
MEMBER:'feature-bonder',-1,0,1,1,7,0,0
MEMBER:'feature-sensor',-1,0,1,2,2,0,0
MEMBER:'instr-arrow',90,0,64,1,1,0,0
MEMBER:'instr-arrow',0,0,64,1,5,0,0
MEMBER:'instr-arrow',180,0,64,6,1,0,0
MEMBER:'instr-arrow',-90,0,64,6,5,0,0
MEMBER:'instr-grab',-1,0,128,1,1,0,0
MEMBER:'instr-sensor',0,0,128,1,2,0,1
MEMBER:'instr-bond',-1,0,128,1,3,0,0
MEMBER:'instr-grab',-1,0,128,1,4,0,0
MEMBER:'instr-grab',-1,1,128,1,5,0,0
MEMBER:'instr-input',-1,0,128,2,1,0,0
MEMBER:'instr-output',-1,0,128,6,1,0,0
MEMBER:'instr-grab',-1,2,128,6,2,0,0
MEMBER:'instr-arrow',-90,0,64,6,2,0,0