SpaceChem Bench: Random Oxides

sensing_3 Medium Sensing Single-reactor Alkonost Random inputs · SpaceChem Bench report →

Random inputs: α Oxygen (O), β Zinc (Zn) / Titanium (Ti). Output: ψ Titanium Dioxide (TiO2) ×10, ω Zinc Oxide (ZnO) ×10. 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. 4 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.

4 / 16models solved it
278best LLM cycles (176 community)
0new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles176278Opus 5.5 · +58%
Reactors11GPT-6 Astra Ties record
Symbols1420Gemini 4 Argon · +43%

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.

Search over time

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Every model

ModelSolvedBest cyclesBest reactorsBest symbolsNew frontier points
01Opus 5.5Yes278122—
02Gemini 4 ArgonYes292120—
03GPT-6.1 SolYes381130—
04GPT-6 AstraYes387122—
05DeepSeek V4.1 FlashNo————
06Fable 5.1No————
07GLM-5.3No————
08GPT-6 LunaNo————
09Gemini 3.8 FlashNo————
10Grok 4.7No————
11Haiku 5.5No————
12Kimi K3.1 ProNo————
13MiMo-V2.6-ProNo————
14Muse Spark 1.3No————
15Muse Wonder 1.0No————
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.

Opus 5.5 Fewest cyclesFewest reactors

278 cycles · 1 reactor · 33 symbolssensing_3.278-1-33.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+ IN α GRAB B+ B+ IN β IN α CW ?Ti↑ DROP GRAB SYNC SYNC ?O↓ DROP OUT ω DROP OUT ψ

Running in the game

Opus 5.5 solution running on sensing_3 in SpaceChem
SpaceChem Community Edition export (sensing_3.278-1-33.txt)
SOLUTION:Random Oxides,Player,0-0-0
COMPONENT:'drag-advanced-reactor',2,0,''
MEMBER:'instr-start',180,0,32,3,4,0,0
MEMBER:'instr-start',180,0,128,3,5,0,0
MEMBER:'feature-bonder',-1,0,1,1,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,2,0,0
MEMBER:'feature-bonder',-1,0,1,2,1,0,0
MEMBER:'feature-bonder',-1,0,1,2,2,0,0
MEMBER:'feature-sensor',-1,0,1,4,2,0,0
MEMBER:'instr-arrow',0,0,64,1,2,0,0
MEMBER:'instr-arrow',-90,0,64,1,5,0,0
MEMBER:'instr-arrow',90,0,64,2,1,0,0
MEMBER:'instr-arrow',180,0,64,4,1,0,0
MEMBER:'instr-bond',-1,0,128,1,2,0,0
MEMBER:'instr-input',-1,0,128,1,4,0,0
MEMBER:'instr-grab',-1,1,128,1,5,0,0
MEMBER:'instr-bond',-1,0,128,2,1,0,0
MEMBER:'instr-bond',-1,0,128,2,2,0,0
MEMBER:'instr-input',-1,1,128,2,5,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-rotate',-1,0,128,4,1,0,0
MEMBER:'instr-sensor',-90,0,128,4,2,0,22
MEMBER:'instr-grab',-1,2,128,2,3,0,0
MEMBER:'instr-sync',-1,0,128,2,4,0,0
MEMBER:'instr-arrow',180,0,64,2,5,0,0
MEMBER:'instr-arrow',90,0,64,4,2,0,0
MEMBER:'instr-arrow',180,0,64,4,3,0,0
MEMBER:'instr-arrow',90,0,64,2,3,0,0
MEMBER:'instr-sync',-1,0,32,2,4,0,0
MEMBER:'instr-arrow',-90,0,16,2,4,0,0
MEMBER:'instr-grab',-1,1,32,2,3,0,0
MEMBER:'instr-arrow',0,0,16,2,3,0,0
MEMBER:'instr-sensor',90,0,32,4,3,0,8
MEMBER:'instr-arrow',0,0,16,4,5,0,0
MEMBER:'instr-grab',-1,2,32,6,5,0,0
MEMBER:'instr-arrow',-90,0,16,6,5,0,0
MEMBER:'instr-output',-1,1,32,6,4,0,0
MEMBER:'instr-arrow',180,0,16,6,4,0,0
MEMBER:'instr-grab',-1,2,32,7,3,0,0
MEMBER:'instr-arrow',90,0,16,7,3,0,0
MEMBER:'instr-output',-1,0,32,7,4,0,0
MEMBER:'instr-arrow',180,0,16,7,4,0,0

Gemini 4 Argon Fewest symbols

436 cycles · 1 reactor · 20 symbolssensing_3.436-1-20.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+ IN α G/D B+ B+ IN α ?Ti↑ DROP OUT ω OUT ψ DROP IN β

Running in the game

Gemini 4 Argon solution running on sensing_3 in SpaceChem
SpaceChem Community Edition export (sensing_3.436-1-20.txt)
SOLUTION:Random Oxides,Player,0-0-0
COMPONENT:'drag-advanced-reactor',2,0,''
MEMBER:'instr-start',180,0,128,3,5,0,0
MEMBER:'instr-start',180,0,32,4,6,0,0
MEMBER:'feature-bonder',-1,0,1,1,1,0,0
MEMBER:'feature-bonder',-1,0,1,2,1,0,0
MEMBER:'feature-bonder',-1,0,1,1,2,0,0
MEMBER:'feature-bonder',-1,0,1,2,2,0,0
MEMBER:'feature-sensor',-1,0,1,3,2,0,0
MEMBER:'instr-arrow',0,0,64,1,2,0,0
MEMBER:'instr-arrow',-90,0,64,1,5,0,0
MEMBER:'instr-arrow',90,0,64,8,2,0,0
MEMBER:'instr-arrow',180,0,64,8,5,0,0
MEMBER:'instr-bond',-1,0,128,1,2,0,0
MEMBER:'instr-input',-1,0,128,1,3,0,0
MEMBER:'instr-grab',-1,0,128,1,5,0,0
MEMBER:'instr-bond',-1,0,128,2,1,0,0
MEMBER:'instr-bond',-1,0,128,2,2,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-sensor',-90,0,128,3,2,0,22
MEMBER:'instr-grab',-1,2,128,7,3,0,0
MEMBER:'instr-output',-1,1,128,7,5,0,0
MEMBER:'instr-output',-1,0,128,8,3,0,0
MEMBER:'instr-grab',-1,2,128,8,5,0,0
MEMBER:'instr-arrow',180,0,64,3,1,0,0
MEMBER:'instr-arrow',90,0,64,2,1,0,0
MEMBER:'instr-arrow',0,0,64,2,3,0,0
MEMBER:'instr-arrow',90,0,64,8,3,0,0
MEMBER:'instr-input',-1,1,128,2,5,0,0