    <SEC-DOCUMENT>0001370053-25-000081-index.html : 20250929
    <SEC-HEADER>0001370053-25-000081.hdr.sgml : 20250929
    <ACCEPTANCE-DATETIME>20250929162955
    ACCESSION NUMBER:		0001370053-25-000081
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		32
    CONFORMED PERIOD OF REPORT:	20250929
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Other Events
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20250929
    DATE AS OF CHANGE:		20250929

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ANAPTYSBIO, INC
    		CENTRAL INDEX KEY:			0001370053
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		ORGANIZATION NAME:           	03 Life Sciences
    		EIN:				203828755
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-37985
    		FILM NUMBER:		251356483

    	BUSINESS ADDRESS:
    		STREET 1:		10770 WATERIDGE CIRCLE, SUITE 210
    		CITY:			SAN DIEGO
    		STATE:			CA
    		ZIP:			92121
    		BUSINESS PHONE:		858-362-6295

    	MAIL ADDRESS:
    		STREET 1:		10770 WATERIDGE CIRCLE, SUITE 210
    		CITY:			SAN DIEGO
    		STATE:			CA
    		ZIP:			92121

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ANAPTYSBIO INC
    		DATE OF NAME CHANGE:	20080828

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	ANAPTYS BIOSCIENCES INC
    		DATE OF NAME CHANGE:	20060724
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>anab-20250929.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: anab-20250929.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>strategicseparationtomax.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: strategicseparationtomax.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>anaptysannouncesintentto.htm
    <DESCRIPTION>EX-99.2
    <TEXT>
    Document 3 - file: anaptysannouncesintentto.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>anab-20250929.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 4 - file: anab-20250929.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>5
    <FILENAME>anab-20250929_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: anab-20250929_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>anab-20250929_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: anab-20250929_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>7
    <FILENAME>anab-20250929_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: anab-20250929_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>anaptysannouncesintentto001.jpg
    <TEXT>
    Document 8 - file: anaptysannouncesintentto001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>anaptysannouncesintentto002.jpg
    <TEXT>
    Document 9 - file: anaptysannouncesintentto002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>anaptysannouncesintentto003.jpg
    <TEXT>
    Document 10 - file: anaptysannouncesintentto003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>anaptysannouncesintentto004.jpg
    <TEXT>
    Document 11 - file: anaptysannouncesintentto004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>strategicseparationtomax001.jpg
    <TEXT>
    Document 12 - file: strategicseparationtomax001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>strategicseparationtomax002.jpg
    <TEXT>
    Document 13 - file: strategicseparationtomax002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>strategicseparationtomax003.jpg
    <TEXT>
    Document 14 - file: strategicseparationtomax003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>strategicseparationtomax004.jpg
    <TEXT>
    Document 15 - file: strategicseparationtomax004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>strategicseparationtomax005.jpg
    <TEXT>
    Document 16 - file: strategicseparationtomax005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>strategicseparationtomax006.jpg
    <TEXT>
    Document 17 - file: strategicseparationtomax006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>strategicseparationtomax007.jpg
    <TEXT>
    Document 18 - file: strategicseparationtomax007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>strategicseparationtomax008.jpg
    <TEXT>
    Document 19 - file: strategicseparationtomax008.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>strategicseparationtomax009.jpg
    <TEXT>
    Document 20 - file: strategicseparationtomax009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>strategicseparationtomax010.jpg
    <TEXT>
    Document 21 - file: strategicseparationtomax010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>22
    <FILENAME>strategicseparationtomax011.jpg
    <TEXT>
    Document 22 - file: strategicseparationtomax011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>23
    <FILENAME>strategicseparationtomax012.jpg
    <TEXT>
    Document 23 - file: strategicseparationtomax012.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>24
    <FILENAME>strategicseparationtomax013.jpg
    <TEXT>
    Document 24 - file: strategicseparationtomax013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>26
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>27
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 27 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>28
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>30
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 30 - file: FilingSummary.html

    Document 30 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>32
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 32 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>33
    <FILENAME>0001370053-25-000081-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 33 - file: 0001370053-25-000081-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>34
    <FILENAME>anab-20250929_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 34 - file: anab-20250929_htm.html

    Document 34 - RAW XML: anab-20250929_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>