KLD comparison of oQ, Q, MXFP and UD MLX quantizations

Reddit r/LocalLLaMA / 4/30/2026

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Key Points

  • The article presents a KLD-based comparison of different MLX quantization schemes (oQ, Q, MXFP, and UD) for local LLM usage.
  • It links to a GitHub repository with detailed results, suggesting the comparisons are based on measured outputs rather than purely theoretical claims.
  • The focus is on how quantization choices affect the divergence metric (KLD), which can be used to evaluate fidelity/quality trade-offs.
  • It is framed as a practical reference for developers trying to pick quantization formats for better performance versus efficiency.
  • Overall, the post acts as a lightweight benchmark report pointing readers to reproducible experiment data.