AI model fingerprints

Name: YFarmX AI Fingerprinting catalogue
Creator: YFarmX

A tokenizer fingerprint shows how a model splits text into tokens. Find a model, compare its fingerprint and explore the evidence behind its family.

Compare two models How fingerprinting works

353 measured models Catalogue: 17 October 2026

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Models measured: 353
Complete fingerprints: 329
Tokenizer groups: 59
Unlabelled models placed: 117 of 132
New since 16 Sept: 44

Catalogue and measurements as at 17 October 2026. Measured counts every model with a validated measurement; complete fingerprints are the subset whose 50 rows all came back clean, and only those carry an exact signature. Every figure derives from one committed dataset; the methodology records how it is measured, and what the method cannot see.

The latest identification

Named from the measurements 18 hours before its operator confirmed it

Union Alpha

stealth/union-alpha · Circuit and ChiselConfirmed by its maker

Confirmed family: Pareto (multi-model blend)
Confirmed as: Pareto 26.9, built by Circuit and Chisel
Confirmed by The Unbiased Co: 17 September 2026
Entered catalogue: 16 September 2026
Last tested: 17 September 2026
Family attribution confidence: Very high

Why very high: the operator confirmed Union Alpha as Pareto 26.9 on 17 September 2026, 18 hours after the YFarmX post named it; the blend carries the Llama 3, Qwen and GLM tokenizers the measurements had read.

Evidence

✓ near-exact agreement (46/47) with meta-llama/llama-3.2-3b-instruct
✓ confirmed as Pareto 26.9, built by Circuit and Chisel by The Unbiased Co, 17 September 2026

Compare with Meta: Llama 3.2 3B Instruct Full identity record

What the measurements say

Findings the current dataset supports

Confirmed callOx Alpha matched Z.ai: GLM 5.3 on all fifty strings, and Z.ai confirmed itA stealth endpoint with no maker named returned token counts identical to GLM 5.3 on every one of the fifty test strings, sharing the signature tk_133b086c. YFarmX published the match on 21 August 2026. Z.ai confirmed the model as GLM-5.3-Flash five days later.See the evidence →Measured twice66 models measured twice: 61 fingerprints held, 3 movedOn 5 October 2026 the most-used models on record were sent the fifty strings again and read against their earlier reading. 61 agreed on every string clean in both runs. 3 did not, and each of those records says which strings moved, by how much, and which provider served each reading.See the evidence →ResolvedSpace Bunny Alpha: a stealth model with a measured familySpace Bunny Alpha declares no family. Independent measurement places it with the MiniMax group at high confidence: exact tokenizer signature shared with 8 models.See the evidence →

Explore the lab

Six ways into the same measurements

01Every modelAll 353 measured models on one page, each row opening its evidence.Open the catalogue →02CompareTwo models side by side: tokenizer agreement string by string, API surface field by field.Open the bench →03Identity watchNew arrivals, fingerprint changes and fresh lineage placements as they are observed.See what changed →04UnknownsStealth endpoints and the 132 models with no family on their label. 117 placed so far.Open the queue →05Tokenizer AtlasThe family structure of the whole catalogue: clusters, constellation and the explorer.Open the Atlas →06MethodologyHow a fingerprint is measured, the controls that gate publication, and the known limits.Read the method →

How it works

01 · MEASURE

Fifty adversarial strings are sent to each model and only the reported prompt-token count is read. The marginal cost of each string under the model's tokenizer becomes a 50-number signature.

02 · COMPARE

Signatures are compared offline against every other model measured. Exact agreement across all fifty strings is strong lineage evidence; the API-surface contract is checked as a second signal of a different kind.

03 · TRACK

Every observation is kept as taken, and the history only ever appends. When an endpoint's fingerprint moves, the history shows what changed and on which day.

A shared tokenizer is evidence of shared lineage, never proof of an exact model. The claims hierarchy keeps every published conclusion inside what the evidence supports, and the controls are published with the results.

Run a fingerprint comparison →Pick any two of the 353 measured models and see all fifty strings