<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-12-02</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002085408</issuerCik>
        <issuerName>General Purpose Acquisition Corp.</issuerName>
        <issuerTradingSymbol>GPAC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001438327</rptOwnerCik>
            <rptOwnerName>Hosseinion Warren</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GENERAL PURPOSE ACQUISITION CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>59 FRONT STREET</rptOwnerStreet2>
            <rptOwnerCity>MILLBROOK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>12545</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibits 24.1 - Powers of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Stewart Crawford, as Attorney-in-Fact for Warren Hosseinion</signatureName>
        <signatureDate>2025-12-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
