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Opti 27B: Qwen3.8-27B in 11.8 GB at 3.47 bpw, within 0.5% of FP16 perplexity and matching Q4_K_M at 30% fewer bytes. Patched llama.cpp runtime, source public, reproduce with one command

TL;DR: Qwen3.8-27B (text + vision) as an 11.8 GB GGUF at 3.47 bits/param. wikitext-2 perplexity 6.487 vs 6.456 for the FP16 original (1.005x) and 6.457 for Q4_K_M at 16.8 GB. Needs a patched llama.cpp build (source in the repo). 42 tok/s single stream on a 3090, same as Q4_K_M on the same card; fou…

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  1. 2026-09-18 02:40 · r/LocalLLM
    Opti 27B: Qwen3.8-27B in 11.8 GB at 3.47 bpw, within 0.5% of FP16 perplexity and matching Q4_K_M at 30% fewer bytes. Patched llama.cpp runtime, source public, reproduce with one command

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