SpaceChem Bench: Removing Bonds

research_tutorial_3 Easy Bonding & routing Single-reactor Sernimir II · SpaceChem Bench report →

Inputs: α Fluorine (F2). Output: ψ Fluorine (F) ×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. 15 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.

15 / 16models solved it
27best LLM cycles (27 community)
0new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles2727GPT-6 Astra Ties record
Reactors11DeepSeek V4.1 Flash Ties record
Symbols77DeepSeek V4.1 Flash Ties record

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 ↙
Loading interactive Pareto explorer…
Community archiveModel frontier pointNew frontier point
Select a point with the mouse or keyboard to inspect its scores and reactor blueprint.

Search over time

Loading puzzle trajectories…

Every model

ModelSolvedBest cyclesBest reactorsBest symbolsNew frontier points
01GPT-6 AstraYes2717—
02GPT-6.1 SolYes3217—
03Opus 5.5Yes3417—
04Gemini 3.8 FlashYes3617—
05Gemini 4 ArgonYes3617—
06Grok 4.7Yes3617—
07Muse Spark 1.3Yes3617—
08Sonnet 5.5Yes3617—
09Fable 5.1Yes4017—
10Kimi K3.1 ProYes4417—
11DeepSeek V4.1 FlashYes4717—
12Muse Wonder 1.0Yes5617—
13GPT-6 LunaYes6117—
14Haiku 5.5Yes69115—
15GLM-5.3Yes93120—
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

27 cycles · 1 reactor · 13 symbolsresearch_tutorial_3.27-1-13.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 G/D IN α OUT ψ B− OUT ψ G/D G/D OUT ψ

Running in the game

GPT-6 Astra solution running on research_tutorial_3 in SpaceChem
SpaceChem Community Edition export (research_tutorial_3.27-1-13.txt)
SOLUTION:Removing Bonds,Player,0-0-0
COMPONENT:'drag-starter-reactor',2,0,''
MEMBER:'instr-start',0,0,128,2,1,0,0
MEMBER:'instr-start',0,0,32,0,1,0,0
MEMBER:'feature-bonder',-1,0,1,5,1,0,0
MEMBER:'feature-bonder',-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:'instr-arrow',0,0,64,1,1,0,0
MEMBER:'instr-arrow',180,0,64,6,1,0,0
MEMBER:'instr-grab',-1,0,128,1,1,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-bond',-1,1,128,5,1,0,0
MEMBER:'instr-grab',-1,0,128,6,1,0,0
MEMBER:'instr-arrow',0,0,16,1,1,0,0
MEMBER:'instr-arrow',180,0,16,6,1,0,0
MEMBER:'instr-grab',-1,0,32,1,1,0,0
MEMBER:'instr-output',-1,0,32,3,1,0,0
MEMBER:'instr-output',-1,0,32,4,1,0,0
MEMBER:'instr-output',-1,0,32,5,1,0,0
MEMBER:'instr-grab',-1,0,32,6,1,0,0

GPT-6 Astra Fewest symbols

55 cycles · 1 reactor · 7 symbolsresearch_tutorial_3.55-1-7.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↓ OUT ψ S← IN α G/D B− G/D

Running in the game

GPT-6 Astra solution running on research_tutorial_3 in SpaceChem
SpaceChem Community Edition export (research_tutorial_3.55-1-7.txt)
SOLUTION:Removing Bonds,Player,0-0-0
COMPONENT:'drag-starter-reactor',2,0,''
MEMBER:'instr-start',90,0,128,0,0,0,0
MEMBER:'instr-start',180,0,32,1,0,0,0
MEMBER:'feature-bonder',-1,0,1,5,1,0,0
MEMBER:'feature-bonder',-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:'instr-arrow',0,0,64,0,1,0,0
MEMBER:'instr-arrow',180,0,64,6,1,0,0
MEMBER:'instr-input',-1,0,128,0,1,0,0
MEMBER:'instr-grab',-1,0,128,1,1,0,0
MEMBER:'instr-bond',-1,1,128,5,1,0,0
MEMBER:'instr-grab',-1,0,128,6,1,0,0
MEMBER:'instr-output',-1,0,32,0,0,0,0