MythoMax 13B

gryphe/mythomax-l2-13b · GrypheDeclared and measured agree
Tokenizer lineage (measured)
Llama2
Evidence confidence
High
Why high: one template-boundary shift from a group whose members all declare the same family.
Declared tokenizer tag
Llama2
Entered catalogue
2 July 2023
Last tested
21 August 2026
Measurement
Measured
Evidence
  • tokenizer signature one template-boundary shift from 1 model

Identity statement

MythoMax 13B is Gryphe's model. Its measured tokenizer sits with the Llama2 group, which is evidence that it builds on the Llama2 tokenizer. Tokenizer reuse is normal engineering, open vocabularies travel between labs, and this says nothing against Gryphe's authorship of the model itself.

Evidence stack

Signals of different kinds, weighed together
SignalResultReference
Tokenizer signatureClean measurement; no exact match yettk_5348f9f6
API surfaceNo other entry shares this exact contractapi_6412e28f
Context and output8,192 context · 4,096 max outputdeclared
Reasoning contractNone declareddeclared
Serving providers observedParasailmeasured 21 August 2026

Shares this fingerprint

Exact signature first; template-boundary shifts of the same signature beneath

Closest measured models

Agreement across the mutually clean test strings

Click a row to open the full comparison.

The measured fingerprint

Marginal prompt-token cost of each test string, grouped by script
All 50 rows

English and whitespace

en-prose16
en-long18
spaces-204
spaces-606
tabs-2022
newlines-2022
mixed-ws9

Digits

digits-99
digits-1212
digits-3030
digits-sep12
float-long22

CJK

zh-common22
zh-long34
zh-rare27
ja-kana16
ja-kanji16
ko29

Other scripts

ru14
ar29
he26
hi31
th26
el33

Emoji

emoji-basic20
emoji-skin40
emoji-zwj-family19
emoji-zwj-x357
emoji-flags32
emoji-prof35

Rare Unicode

math26
boxdraw17
combining10
cjk-ext-b16
surrogates54
zalgo35
rtl-mix13

Code

py-code28
py-indent19
json28
html17
regex52
camel8
snake12

Repetition and encodings

rare-word-x546
repeat-tok41
base6441
hex20
url23
uuid36

An x marks a row excluded as corrupt (caching or provider interference detected during measurement). Overhead subtracted: 36 prompt tokens.

Declared record

What the catalogue claims about this model

One of the highest performing and most popular fine-tunes of Llama 2 13B, with rich descriptions and roleplay. #merge

Modalities
text->text
Declared tokenizer
Llama2
Prompt price
$0.06 / M tokens
Completion price
$0.06 / M tokens

Supported parameters

frequency_penaltylogit_biaslogprobsmax_tokensmin_ppresence_penaltyrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetop_atop_ktop_logprobstop_p

defaults: {}

Catalogue entryWeights on Hugging Face

History

Every observation, kept as taken
  • 2 July 2023Enters the OpenRouter catalogue declared as Llama2.
  • 21 August 2026Fingerprinted in the YFarmX catalogue sweep · 50 of 50 strings measured clean.
  • 21 August 2026YFarmX assessment: consistent with the Llama2 family, high confidence.

Cite this page as the evidence record for MythoMax 13B: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings. The raw data behind every figure is on the data page.