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MoonshotAI: Kimi K2 0905

moonshotai/kimi-k2-0905 · Moonshot AINot yet established
Tokenizer group (measured)
Moonshot AI
Entered catalogue
4 September 2025
Last tested
3 September 2026
Evidence confidence
Moderate

Why moderate: near-exact agreement (49 of 50 strings) with moonshotai/kimi-k3, short of a full exact signature.

Evidence
  • ✓ near-exact agreement (49/50) with moonshotai/kimi-k3

Identity statement

MoonshotAI: Kimi K2 0905 is Moonshot AI's model, and its measured tokenizer sits in Moonshot AI's own signature group alongside its sibling models. No other maker's measured model shares it so far.

What we checked

Four different kinds of evidence, and what each one showed
We checkedWhat we foundWhere it came from
How it counts tokensCounted cleanly, and no other model in the catalogue counts the same waytk_f14a0fdd
How its API is set upA combination of settings no other listing in the catalogue usesapi_87b94582
How much it can read and writeReads up to 262,144 tokens at once, writes up to 98,304its own listing
Who served our requestsNovitawe measured it, 3 September 2026

Closest measured models

Agreement across the mutually clean test strings

Click a row to open the full comparison.

The measured fingerprint

What each test string cost this model, in tokens

We sent MoonshotAI: Kimi K2 0905 fifty short pieces of text and recorded what each one cost it in tokens. The bars below are those costs. Two models built on the same tokenizer produce the same bars; a model built on a different one produces a different set, which is what makes this a fingerprint.

All 50 rows

English and whitespace

en-prose14
en-long16
spaces-203
spaces-603
tabs-204
newlines-204
mixed-ws6

Digits

digits-93
digits-124
digits-3010
digits-sep7
float-long9

CJK

zh-common9
zh-long10
zh-rare18
ja-kana11
ja-kanji14
ko13

Other scripts

ru16
ar15
he16
hi17
th21
el22

Emoji

emoji-basic10
emoji-skin20
emoji-zwj-family11
emoji-zwj-x333
emoji-flags14
emoji-prof20

Rare Unicode

math26
boxdraw24
combining14
cjk-ext-b16
surrogates31
zalgo36
rtl-mix8

Code

py-code25
py-indent15
json20
html16
regex43
camel6
snake6

Repetition and encodings

rare-word-x531
repeat-tok41
base6431
hex11
url17
uuid27

Overhead subtracted: 9 prompt tokens.

Declared record

What the catalogue claims about this model

Kimi K2 0905 is the September update of [Kimi K2 0711](moonshotai/kimi-k2). It is a large-scale Mixture-of-Experts (MoE) language model developed by Moonshot AI, featuring 1 trillion total parameters with 32...

Modalities
text->text
Declared tokenizer
Other
Prompt price
$0.60 / M tokens
Completion price
$2.50 / M tokens

Supported parameters

frequency_penaltymax_tokenspresence_penaltyrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_p

defaults: {}

Catalogue entryWeights on Hugging Face

History

Every observation, kept as taken
  • 4 September 2025Enters the OpenRouter catalogue with no declared family.
  • 3 September 2026Fingerprinted in the YFarmX catalogue sweep · 50 of 50 strings measured clean.
  • 3 September 2026YFarmX assessment: consistent with the Moonshot AI family, moderate confidence.