Building a Popperian Self-Debate Framework with Fable5
Maleficent-Host-8975 · reddit · 2026-07-07
A developer used Claude(Fable 5) to build DeepReason, an open-source project: a reasoning framework that allows LLMs to debate themselves. When a user asks an open-ended "why" question, the framework prompts the model to propose bold hypotheses and then critique them one by one. Each candidate explanation must state what evidence could falsify it; weaker arguments are rejected, and survivors compete head-to-head.
The entire process is written to an append-only log for byte-by-byte reproducibility and can detect whether the model is genuinely exploring or just spinning its wheels. The lightweight version, MiniReason, is about 900 lines long and costs only a few cents per run. The author also included a research agenda titled "Can LLMs Explore?".
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