Qwen2.5 VL 72B Instruct Behavioral Fingerprint
How Qwen's Qwen2.5 VL 72B Instruct answers one-word probe questions at temperature 1.0 — random numbers, colors, animals, coin flips — measured over 432 valid samples in the open dataset of "One Token Is Enough" (arXiv:2607.10252).
Vendor
Qwen
Data generated
2026-07-08
Probe cells
15
Valid samples
432
Randomness score
39 / 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)
42
16 / 29 answers
Favorite color
blue
20 / 30 answers
Coin flip: heads
80%
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 = 0.00 bit · uniform baseline 1.00 bit
| Answer | Count | Share |
|---|---|---|
| heads | 30 | 100.0% |
Coin flip · Chinese
n = 29 · H = 0.98 bit · uniform baseline 1.00 bit
| Answer | Count | Share |
|---|---|---|
| heads | 17 | 58.6% |
| tails | 12 | 41.4% |
Favorite number · English
n = 28 · H = 1.54 bit · uniform baseline 13.29 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 14 | 50.0% |
| 42 | 11 | 39.3% |
| 1 | 1 | 3.6% |
| 3 | 1 | 3.6% |
| 17 | 1 | 3.6% |
Favorite number · Chinese
n = 28 · H = 2.49 bit · uniform baseline 13.29 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 13 | 46.4% |
| 8 | 4 | 14.3% |
| 5 | 3 | 10.7% |
| 4 | 2 | 7.1% |
| 6 | 2 | 7.1% |
| 3 | 1 | 3.6% |
| 13 | 1 | 3.6% |
| 23 | 1 | 3.6% |
+ 1 more answers
Random animal · English
n = 29 · H = 3.23 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| giraffe | 7 | 24.1% |
| koala | 5 | 17.2% |
| elephant | 4 | 13.8% |
| tiger | 2 | 6.9% |
| penguin | 2 | 6.9% |
| panda | 2 | 6.9% |
| lion | 2 | 6.9% |
| kangaroo | 1 | 3.4% |
+ 4 more answers
Random animal · Chinese
n = 28 · H = 2.46 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| 猫 | 10 | 35.7% |
| cat | 9 | 32.1% |
| elephant | 2 | 7.1% |
| dog | 2 | 7.1% |
| butterfly | 1 | 3.6% |
| wolf | 1 | 3.6% |
| bird | 1 | 3.6% |
| running | 1 | 3.6% |
+ 1 more answers
Random city · English
n = 29 · H = 2.87 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| tokyo | 9 | 31.0% |
| berlin | 7 | 24.1% |
| paris | 3 | 10.3% |
| toronto | 3 | 10.3% |
| boston | 1 | 3.4% |
| dublin | 1 | 3.4% |
| madrid | 1 | 3.4% |
| losangeles | 1 | 3.4% |
+ 3 more answers
Random city · Chinese
n = 28 · H = 3.54 bit · uniform baseline 5.64 bit
| Answer | Count | Share |
|---|---|---|
| paris | 8 | 28.6% |
| berlin | 5 | 17.9% |
| 北京 | 1 | 3.6% |
| rome | 1 | 3.6% |
| 东京 | 1 | 3.6% |
| toronto | 1 | 3.6% |
| cairo | 1 | 3.6% |
| boston | 1 | 3.6% |
+ 9 more answers
Random color · English
n = 30 · H = 1.63 bit · uniform baseline 4.91 bit
| Answer | Count | Share |
|---|---|---|
| blue | 20 | 66.7% |
| purple | 4 | 13.3% |
| green | 2 | 6.7% |
| red | 2 | 6.7% |
| indigo | 1 | 3.3% |
| black | 1 | 3.3% |
Random color · Chinese
n = 29 · H = 1.34 bit · uniform baseline 4.91 bit
| Answer | Count | Share |
|---|---|---|
| blue | 16 | 55.2% |
| red | 10 | 34.5% |
| green | 3 | 10.3% |
Random letter · English
n = 29 · H = 2.61 bit · uniform baseline 4.70 bit
| Answer | Count | Share |
|---|---|---|
| b | 9 | 31.0% |
| a | 6 | 20.7% |
| z | 5 | 17.2% |
| x | 3 | 10.3% |
| q | 3 | 10.3% |
| k | 1 | 3.4% |
| j | 1 | 3.4% |
| d | 1 | 3.4% |
Random number 1-10 · English
n = 30 · H = 0.56 bit · uniform baseline 3.32 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 27 | 90.0% |
| 3 | 2 | 6.7% |
| 4 | 1 | 3.3% |
Random number 1-10 · Chinese
n = 28 · H = 1.96 bit · uniform baseline 3.32 bit
| Answer | Count | Share |
|---|---|---|
| 7 | 13 | 46.4% |
| 3 | 6 | 21.4% |
| 4 | 4 | 14.3% |
| 5 | 4 | 14.3% |
| 6 | 1 | 3.6% |
Random number 1-100 · English
n = 29 · H = 1.34 bit · uniform baseline 6.64 bit
| Answer | Count | Share |
|---|---|---|
| 42 | 16 | 55.2% |
| 47 | 11 | 37.9% |
| 37 | 1 | 3.4% |
| 43 | 1 | 3.4% |
Random number 1-100 · Chinese
n = 28 · H = 2.25 bit · uniform baseline 6.64 bit
| Answer | Count | Share |
|---|---|---|
| 47 | 13 | 46.4% |
| 42 | 6 | 21.4% |
| 37 | 4 | 14.3% |
| 27 | 1 | 3.6% |
| 34 | 1 | 3.6% |
| 54 | 1 | 3.6% |
| 57 | 1 | 3.6% |
| 97 | 1 | 3.6% |
Want to verify your API really serves Qwen2.5 VL 72B Instruct?
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.