quantprobe 1.9.2

Probe-then-quantize for LLMs: measure a model's fragility curve, plan bit/tier placement by the tiered decode law, and emit ready-to-run llama.cpp recipes.

quantprobe

How fast will this model run on my machine — and how do I make it faster?

Answers both before you download anything. Then hands you the exact command. Every number measured on one 2016 desktop (GTX 1060 6 GB · 16 GB DDR4 · SATA SSD), and every claim published as a prediction made before the measurement.

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Start here

pip install quantprobe
quantprobe auto

That's it — it detects your machine, asks which model you want, and gets you running. No flags to learn.

Just want the number first? quantprobe plan --gguf model.gguf prints your predicted tok/s, whether it fits, and the launch command. Downloads nothing, takes a second. There's also a browser version with nothing to install.

The two ways to run a model

	Fast — quantprobe auto qwen3-30b	Custom — quantprobe auto qwen3-30b --custom
what it does	picks the best existing quant for your machine, downloads it	measures which layers of your model break under compression, then builds a version tailored to it
time	minutes (mostly download)	~50 min for a 7B, ~10 h for a 35B — it tells you before starting
disk	one file	source + working files, 3–4× bigger
speed	full	identical — speed comes from placement, not from the build
quality	whatever the community published	−9% perplexity at the same file size (measured)

Most people want Fast. Above ~3 bits per weight, community quants are already near-lossless — so --custom refuses to run on machines that don't need it and explains why. The tool declines to sell you its own product.

Use Custom when you're squeezing a model that barely fits (under ~3 bits, where ordinary compression falls off a cliff), you have your own fine-tune nobody has published, or you need maximum quality at a fixed size.

The free speed you probably already have

Most guides put all of a mixture-of-experts model's experts in system RAM and leave your graphics card half empty. Keeping the first N expert layers on the GPU instead — same file, different flags — measured on the reference box:

	all experts → RAM	partial offload
generation	15.18 tok/s	20.44 tok/s (+34.7%)
prompt reading	88 tok/s	~238 tok/s (2–3×)

plan and run now compute the cutoff from your free VRAM and emit the exact flags. It costs nothing and needs no new download. (pre-registration #13 — staked before measuring, including the non-ship condition.)

Measured results

result	number
Qwen3-30B-A3B on the 2016 desktop	19.3 tok/s — predicted 19 before measuring
Same model, partial expert offload	20.44 tok/s, +34.7% for free
Same bytes, different layers (Gemma 4 12B)	byte-identical files, 2.25 ppl apart
Gemma 4 12B depth-aware 2-bit	1.91× → 1.45× quality cost, ~4.5 GB resident
GLM-4.5-Air 110B from a SATA drive, 16 GB RAM	0.19 tok/s — inside the pre-registered 0.2–0.3 band
RAM overclock (XMP, 2133→3000)	dense +52%, pre-registered ×1.41+

One frame, no cuts: Task Manager beside llama.cpp chatting Qwen3-30B-A3B at 20.4 tok/s — above the pre-registered 19. Raw logs + GGUF SHA256: EVIDENCE.txt.

Why you can trust the numbers

Most benchmark posts report what happened. I write the prediction down first, publish it, then run the hardware — and publish the misses just as loudly.

predicted (first)	measured (after)
110B streamed from SATA: 0.2–0.3 tok/s	0.19
RAM overclock scales decode ×1.41+	×1.52
30B hybrid placement: ~19 tok/s	19.30 ± 0.88
a day-old 118B streamed from SATA: 0.2–0.4	0.38 ± 0.17

The misses are the point. A few that are published in full:

• I benchmarked my recipe against a competitor's and lost (#11, +8.9% worse). It exposed two real bugs in mine. Fixed them (#12), then ran a fair rematch on data neither side calibrated for — predicting I'd lose again. I won: 26% better KL divergence. Two of four stakes missed in my favour, still recorded as misses.
• I retracted a headline finding within the hour when my own audit showed it was a measurement artifact — then reproduced the artifact deliberately to prove the cause (Law 5 ledger).
• This tool told users a probe takes "30–60 minutes." It takes 5h40m on a 35 GB model. That was my unmeasured claim, and v1.9.0 replaced it with a derived estimate, a live ETA, and a confirmation prompt.

Plus a byte-identical control (two same-size files, 2.25 ppl apart — only placement differs), a full claim → script → log manifest, and documented dead ends (dynamic top-k, semantic paging, self-speculation — all measured-dead, because a law you only confirm is a law you haven't tested).

The four laws, in one line each

Full statements with measurements and falsifiable predictions in LAWS.md.

1. Rotation is rank-conditional. The standard trick behind modern quantization helps full-rank tensors and destroys low-rank bottlenecks — a ~270,000× swing.
2. Trained networks are dense everywhere. No free lunch left in the weights: 2-bit is the data-free floor.
3. Fragility is measurable, not predictable. Gemma breaks late, Mistral breaks early — architectural near-twins pointing opposite ways. Only a functional probe decides.
4. The tiered decode law. tok/s = η(tier) × bandwidth ÷ active-bytes-per-token. This is the equation that predicts your speed before you download.

All eleven commands

quantprobe auto                                          # interactive: detects, asks, decides, runs
quantprobe auto qwen3-30b --custom --run                 # the full custom pipeline, end to end
quantprobe hw                                            # what the law sees on THIS machine
quantprobe plan     --gguf model.gguf                    # predicted tok/s + placement + launch command
quantprobe optimize --tps 20                             # cheapest path to a speed target, Pareto-ranked
quantprobe target   --tps 5 --ladder                     # inverse: target -> smartest model that fits
quantprobe fetch    qwen3-30b ./models                   # robust, resumable download
quantprobe quantize --gguf f16.gguf --out 2bit.gguf      # build a depth-aware quant
quantprobe probe    --gguf f16.gguf --eval wiki.test.raw # measure YOUR model's fragile band
quantprobe run      --gguf 2bit.gguf                     # plan the placement, then launch chat
quantprobe bench    --gguf 2bit.gguf --contribute        # predicted vs measured; opt-in datapoint
quantprobe dashboard --gguf 2bit.gguf                    # the law live, every reply scored vs prediction

hw/plan/target/optimize need nothing but Python. The weight-touching commands drive stock llama.cpp — point at it with --llama-dir, QUANTPROBE_LLAMA_DIR, or PATH, and preview anything with --dry. 16 machine presets ship in (--machine); multi-GPU and RAID aggregate with comma lists (--vram 24,24).

Windows: 'quantprobe' is not recognized? pip put it in a folder that isn't on your PATH. Use python -m quantprobe ... — identical, always works.

Help grow the law

quantprobe bench --contribute prints exactly what would be shared plus a pre-filled issue link — you review and submit; nothing is ever sent automatically. Points that land outside the predicted bands are the most valuable ones. Open predictions anyone can settle: preregistrations/.

Deep dives

QUICKSTART.md	get running, three levels; recipes for fine-tunes, coding agents, hardware buying
LAWS.md	the four laws — statements, measurements, falsifiable predictions
docs/EXAMPLES.md	worked examples with real output, including the ×5.4 optimizer A/B
docs/HARDWARE.md	the 2016 box: exact specs, measured bandwidths, what the next euro buys
preregistrations/	every staked prediction with its verdict — hits and misses
weights/LAW5_PROTOCOL.md	the live Law-5 research ledger, including the retraction
CHANGELOG.md	every release

Honest limitations

• Perplexity and KL divergence are my metrics; I haven't run task-level evals (MMLU/HellaSwag) yet.
• The fragility atlas covers four model families — enough to disprove universality, not to chart every architecture.
• 0.19 tok/s for a 110B is a capacity demonstration, not usable inference.
• Speed numbers are single-stream decode on one machine (±25% across environments); the η values are fitted, not derived.
• No custom runtime: everything rides stock llama.cpp.

Credits

colibri (744B on 25 GB, pure C) inspired the tier-streaming exploration. The quantization stack builds on llama.cpp and the QTIP/QuIP# incoherence codecs — whose central tool our first law bounds. Independent research by Federico Sciuca, AI-supported, on one desktop.

Two community contributions changed the tool measurably: u/RogerAI--fyi (Reddit) observed that the Law 4 formulation omitted per-token KV reads — measured, confirmed, shipped within a day. u/MoneroApe pointed me at apex-quant and TurboQuant, and testing against mudler's APEX exposed two real gaps in my recipe: unprotected always-active tensors (their kurtosis argument, adopted here) and no importance-matrix calibration at all. The head-to-head and its scope limits are published in full, loss first.

License

MIT — see LICENSE. © 2026 Federico Sciuca.