Gemma 3 4B Behavioral Fingerprint
How Google's Gemma 3 4B answers one-word probe questions at temperature 1.0 — random numbers, colors, animals, coin flips — measured over 438 valid samples in the open dataset of "One Token Is Enough" (arXiv:2607.10252).
Vendor
Data generated
2026-07-08
Probe cells
15
Valid samples
438
Randomness score
15 / 100
Mean normalized entropy across cells, 0–100. 100 would be a uniform-random baseline; real models score far lower.
Signature answers
Favorite random number (1–100)
73
20 / 30 answers
Favorite color
blue
18 / 30 answers
Coin flip: heads
53%
Share of heads across coin-flip cells.
Answer distributions by probe cell
Empirical distributions of normalized one-word answers, per task and language. H is the Shannon entropy in bits; the uniform baseline is log2 of the answer-domain size.
Coin flip · English
n = 30 · H = 0.35 bit · uniform baseline 1.00 bit
| Answer | Count | Share |
|---|---|---|
| tails | 28 | 93.3% |
| heads | 2 | 6.7% |
Coin flip · Chinese
n = 30 · H = 0.00 bit · uniform baseline 1.00 bit
| Answer | Count | Share |
|---|---|---|
| heads | 30 | 100.0% |
Favorite number · English
n = 18 · H = 0.00 bit · uniform baseline 13.29 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 18 | 100.0% |
Favorite number · Chinese
n = 30 · H = 0.00 bit · uniform baseline 13.29 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 30 | 100.0% |
Random animal · English
n = 30 · H = 0.21 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| elephant | 29 | 96.7% |
| rabbit | 1 | 3.3% |
Random animal · Chinese
n = 30 · H = 2.88 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| 猫 | 9 | 30.0% |
| 狗 | 6 | 20.0% |
| 企鹅 | 4 | 13.3% |
| 熊 | 3 | 10.0% |
| 乌龟 | 2 | 6.7% |
| 老虎 | 2 | 6.7% |
| 蓝鲸 | 1 | 3.3% |
| 小狗 | 1 | 3.3% |
+ 2 more answers
Random city · English
n = 30 · H = 2.78 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| paris | 8 | 26.7% |
| seattle | 6 | 20.0% |
| toronto | 6 | 20.0% |
| tokyo | 3 | 10.0% |
| london | 2 | 6.7% |
| denver | 2 | 6.7% |
| austin | 1 | 3.3% |
| rome | 1 | 3.3% |
+ 1 more answers
Random city · Chinese
n = 30 · H = 1.38 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| 东京 | 21 | 70.0% |
| 巴黎 | 5 | 16.7% |
| 伦敦 | 2 | 6.7% |
| 纽约 | 1 | 3.3% |
| 上海 | 1 | 3.3% |
Random color · English
n = 30 · H = 0.97 bit · uniform baseline 4.91 bit
| Answer | Count | Share |
|---|---|---|
| blue | 18 | 60.0% |
| purple | 12 | 40.0% |
Random color · Chinese
n = 30 · H = 1.01 bit · uniform baseline 4.91 bit
| Answer | Count | Share |
|---|---|---|
| 蓝 | 23 | 76.7% |
| 紫 | 4 | 13.3% |
| 绿 | 3 | 10.0% |
Random letter · English
n = 30 · H = 0.56 bit · uniform baseline 4.70 bit
| Answer | Count | Share |
|---|---|---|
| q | 27 | 90.0% |
| x | 2 | 6.7% |
| k | 1 | 3.3% |
Random number 1-10 · English
n = 30 · H = 0.00 bit · uniform baseline 3.32 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 30 | 100.0% |
Random number 1-10 · Chinese
n = 30 · H = 0.00 bit · uniform baseline 3.32 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 30 | 100.0% |
Random number 1-100 · English
n = 30 · H = 1.07 bit · uniform baseline 6.64 bit
| Answer | Count | Share |
|---|---|---|
| 73 | 20 | 66.7% |
| 42 | 9 | 30.0% |
| 67 | 1 | 3.3% |
Random number 1-100 · Chinese
n = 30 · H = 0.00 bit · uniform baseline 6.64 bit
| Answer | Count | Share |
|---|---|---|
| 73 | 30 | 100.0% |
Want to verify your API really serves Gemma 3 4B?
Point the free fingerprint checker at your endpoint: it samples the same probe questions from your browser and compares the distributions against this reference. Your API key never leaves your browser.
Verify your endpointData source & license
Distributions: Tomáš Bruckner, "One Token Is Enough" (arXiv:2607.10252), official dataset Zenodo DOI 10.5281/zenodo.21278557, licensed CC-BY-4.0. Collected via OpenRouter at temperature 1.0 under the paper's fixed minimal one-word system prompt; answer keys are re-normalized with the checker's pipeline (color aliases, number words, coin h/t) so live probes are directly comparable.