Reasoning Demos LLM Thinking Machines
About GitHub
3 demos available

Watch language models think.

Each demo opens up a different facet of how modern reasoning models work — their strategies, their failure modes, and the scaffolding that shapes both.

20 Questions Arena
Three open-source models compete to guess your secret word. Swap their prompt scaffolding to see how harness quality shapes reasoning.
● Live New
Open demo →
Form OCR
Watch a vision-capable model parse messy handwritten forms into structured data — and see where it second-guesses itself.
● Live
Open demo →
Design Reasoning Chain
Multiple LLM personas — designer, critic, integrator — collaborate on a problem. Reasoning is shown step by step.
● Live
Open demo →