Qwen3.8 27B quantization benchmark: 4-bit holds up, 1-bit collapses
victormustar · x · 2026-09-09
Quesma benchmarked Qwen3.8 27B GGUF quantizations on GPQA Diamond, IFBench, and Terminal-Bench 2.1.
- Full BF16 weighs 55 GB; the 17 GB Q4KM matches it on Terminal-Bench 2.1 and fits a 24 GB card with 64k context
- 2-bit (10.7 GB) degrades noticeably
- 1-bit (6.2 GB) performs near random chance on GPQA Diamond, and longer reasoning makes it worse
Takeaway: 4-bit is the practical floor for local use.
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