---
pretty_name: "gemma-4-26B-A4B-it quantization analysis"
tags:
- "quantization"
- "kl-divergence"
- "distribution-fidelity"
- "evaluation"
---

# gemma-4-26B-A4B-it quantization analysis

Mean KL divergence against on-disk size

Scored under the distribution-fidelity laws, version 15. Read [`LAWS.md`](LAWS.md) first: these numbers are comparable only within this artifact's token suite, geometry, and runtime identity, and not against any number produced elsewhere.

Each candidate directory holds its one-pager (`report.md`), its raw report, its compliance receipt, and its Law 14 attribution where one was produced. `reference/` carries the reusable teacher tensors and head, so a third party can score a new candidate without loading the reference checkpoint. `checksums.txt` covers every file here.

## Candidates by paired routed-model fidelity

| Candidate | Scheme | On disk | QxQ KLD | BxQ KLD | QxQ - BxQ | Natural route flips | Exact repeat |
|---|---|---|---|---|---|---|---|
| RedHatAI/gemma-4-26B-A4B-it-FP8-dynamic | fp8_per_channel | 26.68 GiB | 0.69415039 | 0.49783177 | +0.19631862 | 50.6828% | certified |
| cyankiwi/gemma-4-26B-A4B-it-AWQ-4bit | int4_g32_sym | 16.01 GiB | 1.02626820 | 0.84088786 | +0.18538034 | 62.7369% | certified |
| unsloth/gemma-4-26B-A4B-it-NVFP4 | nvfp4 | 15.75 GiB | 1.13846019 | 0.95586495 | +0.18259525 | 65.3084% | certified |
| dhruvil237/gemma-4-26B-A4B-it-W4A16 | int4_g64_sym | 14.58 GiB | 1.15926068 | 1.01252351 | +0.14673717 | 66.7300% | certified |
| Intel/gemma-4-26B-A4B-it-int4-AutoRound | int4_g128_sym | 14.31 GiB | 1.17816288 | 0.90308200 | +0.27508088 | 93.0727% | certified |
| lcu0312/gemma-4-26B-A4B-it-AWQ-4bit | int4_g32_sym | 16.01 GiB | 1.23587221 | 1.08009636 | +0.15577585 | 66.1806% | certified |
| RedHatAI/gemma-4-26B-A4B-it-NVFP4 | nvfp4 | 15.30 GiB | 1.77968754 | 1.54324011 | +0.23644744 | 74.7339% | certified |
| Neural-ICE/Gemma-4-26B-A4B-it-NVFP4 | nvfp4 | 15.29 GiB | 1.82281421 | 1.58512109 | +0.23769312 | 74.4778% | certified |
| bg-digitalservices/Gemma-4-26B-A4B-it-NVFP4 | nvfp4 | 15.29 GiB | 1.82307292 | 1.59361302 | +0.22945990 | 74.5241% | certified |

## QxQ fidelity against size

![QxQ KLD against on-disk size](qxq-vs-size.png)

## BxQ fidelity against size

![BxQ KLD against on-disk size](bxq-vs-size.png)

The numbers behind the charts are in [`kld-vs-size.json`](kld-vs-size.json), because a picture is not evidence.

## Explicitly excluded checkpoints

These pinned revisions were deliberately not scored. They are listed so a known-bad checkpoint is never silently retried or mistaken for an omitted result.

- `cklaus/gemma-4-26B-A4B-it-NVFP4@54218eb0fd33da17632f0d91be841d09a7724a6c` — Scored on vLLM fdc0b57e while every other candidate scored on c798225a, so its report binds a reference capture the family no longer publishes (Law 12) and it ranks in a comparability group of one. Withdrawn rather than rescored: no measurement of this checkpoint is in question, only the provenance it carries.