We ran the same pinned pipeline twice — two different operators, fresh containers, same commands — on two Apache-2.0 models (Qwen2.5-0.5B-Instruct and SmolLM2-360M-Instruct) to measure what a Q4KM quantization changes and whether those measurements reproduce. What reproduced across both runs (exact, or within ±2%): - the F16 and Q4KM GGUF files are byte-identical (SHA-256); - perplexity on the Wikitext-2 test set (fixed 128 x 512-token budget) is identical to four decimals for each arm between runs; - HellaSwag accnorm over a fixed 200-task subset is identical between runs for each arm (the arms are not expected to match each other; SmolLM2 F16 52.50% vs Q4KM 54.50%); - peak RSS during the…