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Opus 5.5 wrote its own quantiser for Qwen3.5-0.8B, no llama-quantize, no imatrix. 5.9× better than Unsloth's same-size file.

Inspired by Weight Space Programming (MIT CSAIL, Nov 2), but in the end Opus 5.5 did its own thing: no weight-space technique was used. It wrote a quantiser from scratch in NumPy and made every precision decision from measurement. Rules: only the BF16 file as input, no quantisation tool, no imatrix…

Read the full story at r/LocalLLM ↗

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  1. 2026-11-07 14:54 · r/LocalLLM
    Opus 5.5 wrote its own quantiser for Qwen3.5-0.8B, no llama-quantize, no imatrix. 5.9× better than Unsloth's same-size file.

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