Z.ai: GLM 5.3 Flash

z-ai/glm-5.3-flash · Z.aiNot yet established

Declared family: Unknown
Evidence confidence: Unknown
Declared tokenizer tag: Other
Entered catalogue: 26 August 2026
Last tested: 3 September 2026
Measurement: Measured

Identity statement

Z.ai: GLM 5.3 Flash has a clean measured fingerprint that currently sits alone: no other measured model shares its signature.

Evidence stack

Signals of different kinds, weighed together

Signal	Result	Reference
Tokenizer signature	Exact match with 6 other models	tk_133b086c
API surface	Identical contract to 1 other entry	api_75fd80f3
Context and output	1,310,720 context · 131,072 max output	declared
Reasoning contract	Mandatory · efforts max, high, low · default max	declared
Serving providers observed	SiliconFlow	measured 3 September 2026

Shares this fingerprint

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

Ox Alphastealth/ox-alphaexact · 50/50 Z.ai: GLM 4.7 Flashz-ai/glm-4.7-flashexact · 50/50 Z.ai: GLM 5z-ai/glm-5exact · 50/50 Z.ai: GLM 5 Turboz-ai/glm-5-turboexact · 50/50 Z.ai: GLM 5.1z-ai/glm-5.1exact · 50/50 Z.ai: GLM 5.3z-ai/glm-5.3exact · 50/50 Z.ai: GLM 5.2z-ai/glm-5.2same tokenizer · template shift AionLabs: Aion-3.0aion-labs/aion-3.0same tokenizer · template shift

Closest measured models

Agreement across the mutually clean test strings

Ox Alphastealth/ox-alpha50/50 · 100%Z.ai: GLM 5.3z-ai/glm-5.350/50 · 100%Z.ai: GLM 4.7 Flashz-ai/glm-4.7-flash50/50 · 100%Z.ai: GLM 5z-ai/glm-550/50 · 100%Z.ai: GLM 5.1z-ai/glm-5.150/50 · 100%Z.ai: GLM 5 Turboz-ai/glm-5-turbo50/50 · 100%

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-prose14

en-long16

spaces-203

spaces-603

tabs-203

newlines-204

mixed-ws5

Digits

digits-95

digits-127

digits-3010

digits-sep9

float-long14

CJK

zh-common9

zh-long10

zh-rare18

ja-kana10

ja-kanji14

ko17

Other scripts

ru13

ar13

he24

hi27

th24

el14

Emoji

emoji-basic5

emoji-skin10

emoji-zwj-family7

emoji-zwj-x321

emoji-flags24

emoji-prof15

Rare Unicode

math27

boxdraw28

combining10

cjk-ext-b13

surrogates40

zalgo22

rtl-mix8

Code

py-code25

py-indent15

json21

html16

regex44

camel5

snake6

Repetition and encodings

rare-word-x531

repeat-tok22

base6435

hex14

url17

uuid28

An x marks a row excluded as corrupt (caching or provider interference detected during measurement). Overhead subtracted: 12 prompt tokens.

Declared record

What the catalogue claims about this model

GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks. Its hybrid sparse and linear attention architecture maintains accurate long-context behavior while...

Modalities: text+image+video->text
Declared tokenizer: Other
Prompt price: $0.09 / M tokens
Completion price: $0.30 / M tokens

Supported parameters

frequency_penaltyinclude_reasoninglogit_biaslogprobsmax_tokensmin_pparallel_tool_callspresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_ktop_logprobstop_p

defaults: {"temperature":1,"top_p":0.95}

Catalogue entry Weights on Hugging Face

History

Every observation, kept as taken

26 August 2026Enters the OpenRouter catalogue with no declared family.
3 September 2026Fingerprinted in the YFarmX catalogue sweep · 50 of 50 strings measured clean.

Cite this page as the evidence record for Z.ai: GLM 5.3 Flash: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.