Drex Max v1 is a 27B open-weight decision model that runs on a 24GB Mac
AspireAI community · Nace.AI
*A decision model that never writes a word is now open weights, and it fits on a 24GB Mac.*
Nace.AI's Drex Max v1 takes a context plus named questions and returns a probability for every option in one forward pass. Nothing is generated. It is a dense 27-billion-parameter backbone with a 255-way readout head, shipped as bf16, a Q8_0 GGUF and an affine Q4 checkpoint, with forks of llama.cpp and Ollama. The Q4 build runs on a Mac with 24GB of memory. It scores 67.52 on the public Decision Index 0.4 and 64 on the Artificial Analysis Decision Index, ahead of Claude Haiku 5.5 low, at 61.
The honest limit: those scores come from Nace's own model card, and the card dates them October 19, not the weights release.
https://huggingface.co/nace-ai/drex-max-v1
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Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.