SpaceChem Bench: Settling into the Routine
bonding_6 Easy Multi-reactor production Multi-reactor Danopth · 
SpaceChem Bench report →
Inputs: α Methane (CH4). Output: ψ Hydrogen (H2) ×10, ω Ethane (C2H6) ×10. Features: Max reactors: 3.
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. 9 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.
9 / 16models solved it
827best LLM cycles (820 community)
0new frontier points
Records
| Score | Community best | Best LLM | Model |
|---|---|---|---|
| Cycles | 820 | 827 | GPT-6 Astra · +1% |
| Reactors | 3 | 3 | GPT-6 Astra Ties record |
| Symbols | 25 | 26 | GPT-6 Astra · +4% |
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
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Select a point with the mouse or keyboard to inspect its scores and reactor blueprint.
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The search over time
Best in-game score so far, before replay. Each score can come from a different solution, and lines stop when the episode ends.
Every model
| Model | Solved | Best cycles | Best reactors | Best symbols | New frontier points |
|---|---|---|---|---|---|
| 01GPT-6 Astra | Yes | 827 | 3 | 26 | — |
| 02Opus 5.5 | Yes | 1,168 | 3 | 60 | — |
| 03Sonnet 5.5 | Yes | 1,321 | 3 | 64 | — |
| 04GPT-6.1 Sol | Yes | 1,326 | 3 | 48 | — |
| 05Muse Wonder 1.0 | Yes | 1,340 | 3 | 56 | — |
| 06Kimi K3.1 Pro | Yes | 1,635 | 3 | 65 | — |
| 07Gemini 3.8 Flash | Yes | 1,789 | 3 | 70 | — |
| 08Gemini 4 Argon | Yes | 1,938 | 3 | 62 | — |
| 09Muse Spark 1.3 | Yes | 2,258 | 3 | 56 | — |
| 10DeepSeek V4.1 Flash | No | — | — | — | — |
| 11Fable 5.1 | No | — | — | — | — |
| 12GLM-5.3 | No | — | — | — | — |
| 13GPT-6 Luna | No | — | — | — | — |
| 14Grok 4.7 | No | — | — | — | — |
| 15Haiku 5.5 | No | — | — | — | — |
| 16MiMo-V2.6-Pro | No | — | — | — | — |
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
827 cycles · 3 reactors · 36 symbolsbonding_6.827-3-36.txt on GitHub
Layout (Reactor 1 of 3)
Running in the game
SpaceChem Community Edition export (bonding_6.827-3-36.txt)
SOLUTION:Settling into the Routine,Player,0-0-0
COMPONENT:'drag-disassembly-reactor',11,2,''
MEMBER:'instr-start',-90,0,128,1,4,0,0
MEMBER:'instr-start',90,0,32,7,4,0,0
MEMBER:'feature-bonder-minus',-1,0,1,7,1,0,0
MEMBER:'feature-bonder-minus',-1,0,1,8,1,0,0
MEMBER:'feature-bonder-minus',-1,0,1,0,7,0,0
MEMBER:'feature-bonder-minus',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,1,2,0,0
MEMBER:'instr-arrow',-90,0,64,1,6,0,0
MEMBER:'instr-arrow',90,0,64,7,2,0,0
MEMBER:'instr-arrow',180,0,64,7,6,0,0
MEMBER:'instr-grab',-1,1,128,1,2,0,0
MEMBER:'instr-input',-1,0,128,1,3,0,0
MEMBER:'instr-output',-1,1,128,6,6,0,0
MEMBER:'instr-bond',-1,1,128,7,2,0,0
MEMBER:'instr-output',-1,0,128,7,3,0,0
MEMBER:'instr-grab',-1,2,128,7,6,0,0
MEMBER:'instr-arrow',0,0,16,1,2,0,0
MEMBER:'instr-arrow',-90,0,16,1,6,0,0
MEMBER:'instr-arrow',90,0,16,7,2,0,0
MEMBER:'instr-arrow',180,0,16,7,6,0,0
MEMBER:'instr-grab',-1,1,32,1,2,0,0
MEMBER:'instr-input',-1,0,32,1,3,0,0
MEMBER:'instr-output',-1,1,32,6,6,0,0
MEMBER:'instr-bond',-1,1,32,7,2,0,0
MEMBER:'instr-output',-1,0,32,7,3,0,0
MEMBER:'instr-grab',-1,2,32,7,6,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,2
PIPE:0,5,3
PIPE:0,5,4
PIPE:0,5,5
PIPE:0,5,6
PIPE:0,5,7
PIPE:1,4,2
PIPE:1,4,3
PIPE:1,4,4
PIPE:1,4,5
PIPE:1,4,6
PIPE:1,4,7
PIPE:1,4,8
PIPE:1,4,9
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-assembly-reactor',17,8,''
MEMBER:'instr-start',180,0,128,4,1,0,0
MEMBER:'instr-start',180,0,32,1,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,2,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,3,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,0,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,2,1,0,0
MEMBER:'instr-arrow',180,0,64,7,1,0,0
MEMBER:'instr-grab',-1,0,128,2,1,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-output',-1,0,128,6,1,0,0
MEMBER:'instr-grab',-1,0,128,7,1,0,0
MEMBER:'instr-bond',-1,0,32,0,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,2
PIPE:0,5,3
PIPE:0,5,4
PIPE:0,5,5
COMPONENT:'drag-assembly-reactor',17,17,''
MEMBER:'instr-start',180,0,128,4,1,0,0
MEMBER:'instr-start',180,0,32,1,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,1,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,2,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,0,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,0,1,0,0
MEMBER:'instr-arrow',180,0,64,9,1,0,0
MEMBER:'instr-grab',-1,0,128,0,1,0,0
MEMBER:'instr-rotate',-1,0,128,1,1,0,0
MEMBER:'instr-rotate',-1,0,128,2,1,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-output',-1,0,128,8,1,0,0
MEMBER:'instr-grab',-1,0,128,9,1,0,0
MEMBER:'instr-bond',-1,0,32,0,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,2
COMPONENT:'drag-oceanic-input',8,3,''
PIPE:0,2,0
GPT-6 Astra
1,617 cycles · 3 reactors · 26 symbolsbonding_6.1617-3-26.txt on GitHub
Layout (Reactor 1 of 3)
Running in the game
SpaceChem Community Edition export (bonding_6.1617-3-26.txt)
SOLUTION:Settling into the Routine,Player,0-0-0
COMPONENT:'drag-disassembly-reactor',11,2,''
MEMBER:'instr-start',-90,0,128,1,4,0,0
MEMBER:'instr-start',180,0,32,1,7,0,0
MEMBER:'feature-bonder-minus',-1,0,1,7,1,0,0
MEMBER:'feature-bonder-minus',-1,0,1,8,1,0,0
MEMBER:'feature-bonder-minus',-1,0,1,0,7,0,0
MEMBER:'feature-bonder-minus',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,1,2,0,0
MEMBER:'instr-arrow',-90,0,64,1,6,0,0
MEMBER:'instr-arrow',90,0,64,7,2,0,0
MEMBER:'instr-arrow',180,0,64,7,6,0,0
MEMBER:'instr-grab',-1,1,128,1,2,0,0
MEMBER:'instr-input',-1,0,128,1,3,0,0
MEMBER:'instr-output',-1,1,128,6,6,0,0
MEMBER:'instr-bond',-1,1,128,7,2,0,0
MEMBER:'instr-grab',-1,2,128,7,6,0,0
MEMBER:'instr-output',-1,0,32,0,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,2
PIPE:0,5,3
PIPE:0,5,4
PIPE:0,5,5
PIPE:0,5,6
PIPE:0,5,7
PIPE:1,4,2
PIPE:1,4,3
PIPE:1,4,4
PIPE:1,4,5
PIPE:1,4,6
PIPE:1,4,7
PIPE:1,4,8
PIPE:1,4,9
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-assembly-reactor',17,8,''
MEMBER:'instr-start',180,0,128,4,1,0,0
MEMBER:'instr-start',180,0,32,1,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,2,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,3,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,0,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,2,1,0,0
MEMBER:'instr-arrow',180,0,64,7,1,0,0
MEMBER:'instr-grab',-1,0,128,2,1,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-output',-1,0,128,6,1,0,0
MEMBER:'instr-grab',-1,0,128,7,1,0,0
MEMBER:'instr-bond',-1,0,32,0,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,2
PIPE:0,5,3
PIPE:0,5,4
PIPE:0,5,5
COMPONENT:'drag-assembly-reactor',17,17,''
MEMBER:'instr-start',180,0,128,4,1,0,0
MEMBER:'instr-start',180,0,32,1,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,1,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,2,1,0,0
MEMBER:'feature-bonder-plus',-1,0,1,0,7,0,0
MEMBER:'feature-bonder-plus',-1,0,1,9,7,0,0
MEMBER:'instr-arrow',0,0,64,0,1,0,0
MEMBER:'instr-arrow',180,0,64,9,1,0,0
MEMBER:'instr-grab',-1,0,128,0,1,0,0
MEMBER:'instr-rotate',-1,0,128,1,1,0,0
MEMBER:'instr-rotate',-1,0,128,2,1,0,0
MEMBER:'instr-input',-1,0,128,3,1,0,0
MEMBER:'instr-output',-1,0,128,8,1,0,0
MEMBER:'instr-grab',-1,0,128,9,1,0,0
MEMBER:'instr-bond',-1,0,32,0,7,0,0
PIPE:0,4,1
PIPE:0,5,1
PIPE:0,5,2
COMPONENT:'drag-oceanic-input',8,3,''
PIPE:0,2,0