SpaceChem Bench: An Introduction to Pipelines
production_tutorial_1 Easy Multi-reactor production Multi-reactor Sernimir IV · 
SpaceChem Bench report →
Inputs: α Benzene (C6H6), β Acetonitrile (CH3CN). Output: ψ Acetonitrile (CH3CN) ×10, ω Benzene (C6H6) ×10. Features: Max reactors: 0.
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. 16 of 16 models solved it. No model found a new Pareto-frontier point beyond the frozen community archive.
Records
| Score | Community best | Best LLM | Model |
|---|---|---|---|
| Cycles | 407 | 407 | GPT-6 Astra Ties record |
| Reactors | 0 | 0 | DeepSeek V4.1 Flash Ties record |
| Symbols | 0 | 0 | DeepSeek 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 ↙Search over time
Loading puzzle trajectories…
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 | 407 | 0 | 0 | — |
| 02GPT-6.1 Sol | Yes | 407 | 0 | 0 | — |
| 03Gemini 3.8 Flash | Yes | 407 | 0 | 0 | — |
| 04Grok 4.7 | Yes | 407 | 0 | 0 | — |
| 05Opus 5.5 | Yes | 407 | 0 | 0 | — |
| 06DeepSeek V4.1 Flash | Yes | 414 | 0 | 0 | — |
| 07Fable 5.1 | Yes | 414 | 0 | 0 | — |
| 08GPT-6 Luna | Yes | 414 | 0 | 0 | — |
| 09Gemini 4 Argon | Yes | 414 | 0 | 0 | — |
| 10Haiku 5.5 | Yes | 414 | 0 | 0 | — |
| 11MiMo-V2.6-Pro | Yes | 414 | 0 | 0 | — |
| 12Muse Spark 1.3 | Yes | 414 | 0 | 0 | — |
| 13Muse Wonder 1.0 | Yes | 414 | 0 | 0 | — |
| 14Sonnet 5.5 | Yes | 414 | 0 | 0 | — |
| 15GLM-5.3 | Yes | 415 | 0 | 0 | — |
| 16Kimi K3.1 Pro | Yes | 418 | 0 | 0 | — |
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
407 cycles · 0 reactors · 0 symbolsproduction_tutorial_1.407-0-0.txt on GitHub
Layout
This solution uses 0 reactors (overworld pipe connection only).
Running in the game
SpaceChem Community Edition export (production_tutorial_1.407-0-0.txt)
SOLUTION:An Introduction to Pipelines,Player,0-0-0
COMPONENT:'drag-silo-input',9,4,''
PIPE:0,5,2
PIPE:0,6,2
PIPE:0,7,2
PIPE:0,8,2
PIPE:0,9,2
PIPE:0,9,3
PIPE:0,9,4
PIPE:0,9,5
PIPE:0,9,6
PIPE:0,9,7
PIPE:0,9,8
PIPE:0,9,9
PIPE:0,10,9
PIPE:0,11,9
PIPE:0,12,9
PIPE:0,13,9
COMPONENT:'drag-silo-input',8,12,''
PIPE:0,5,2
PIPE:0,6,2
PIPE:0,7,2
PIPE:0,8,2
PIPE:0,8,1
PIPE:0,8,0
PIPE:0,8,-1
PIPE:0,8,-2
PIPE:0,8,-3
PIPE:0,8,-4
PIPE:0,8,-5
PIPE:0,9,-5
PIPE:0,10,-5
PIPE:0,11,-5
PIPE:0,12,-5
PIPE:0,13,-5
PIPE:0,14,-5