3B TwIL Model Outperforms 120B Open Source Model on Formal Reasoning

Socially-great8275 · reddit · 2026-09-02

webAI released TwIL, a family of formal logic models (1.7B and 3B). The 3B TwIL-LM3 beats the 120B gpt-oss-120b on 4 out of 5 formal reasoning benchmarks while being 40x smaller and runnable on an iPhone. It uses WiSE-FT weight interpolation to mitigate catastrophic forgetting during fine-tuning. The models are released under a non-commercial license.

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