<?xml version="1.0" encoding="US-ASCII"?>  
<!-- Generated by CompSci Transform (tm) - http://www.compsciresources.com -->    
<!-- Created: Fri Jul 11 17:08:44 UTC 2025 -->  
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">    
  <labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">    
    <loc xlink:type="locator" xlink:label="bxsl_RisksRelatedToOurBusinessAndStructureMember" xlink:href="bxsl-20250711.xsd#bxsl_RisksRelatedToOurBusinessAndStructureMember"/>     
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_RisksRelatedToOurBusinessAndStructureMember_lbl" xml:lang="en-US">Risks Related to Our Business and Structure [Member]</label>  
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_RisksRelatedToOurBusinessAndStructureMember" xlink:to="bxsl_RisksRelatedToOurBusinessAndStructureMember_lbl"/>  
    <loc xlink:type="locator" xlink:label="bxsl_RisksRelatedToOurInvestmentsMember" xlink:href="bxsl-20250711.xsd#bxsl_RisksRelatedToOurInvestmentsMember"/>  
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_RisksRelatedToOurInvestmentsMember_lbl" xml:lang="en-US">Risks Related to Our Investments [Member]</label>  
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_RisksRelatedToOurInvestmentsMember" xlink:to="bxsl_RisksRelatedToOurInvestmentsMember_lbl"/>    
    <loc xlink:type="locator" xlink:label="bxsl_RisksRelatedToTheAdvisersAndTheirAffiliatesMember" xlink:href="bxsl-20250711.xsd#bxsl_RisksRelatedToTheAdvisersAndTheirAffiliatesMember"/>  
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_RisksRelatedToTheAdvisersAndTheirAffiliatesMember_lbl" xml:lang="en-US">Risks Related to the Advisers and Their Affiliates [Member]</label>     
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_RisksRelatedToTheAdvisersAndTheirAffiliatesMember" xlink:to="bxsl_RisksRelatedToTheAdvisersAndTheirAffiliatesMember_lbl"/>    
    <loc xlink:type="locator" xlink:label="bxsl_RisksRelatedToBusinessDevelopmentCompaniesMember" xlink:href="bxsl-20250711.xsd#bxsl_RisksRelatedToBusinessDevelopmentCompaniesMember"/>     
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_RisksRelatedToBusinessDevelopmentCompaniesMember_lbl" xml:lang="en-US">Risks Related to Business Development Companies [Member]</label> 
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_RisksRelatedToBusinessDevelopmentCompaniesMember" xlink:to="bxsl_RisksRelatedToBusinessDevelopmentCompaniesMember_lbl"/>  
    <loc xlink:type="locator" xlink:label="bxsl_RisksRelatedToDebtFinancingMember" xlink:href="bxsl-20250711.xsd#bxsl_RisksRelatedToDebtFinancingMember"/>     
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_RisksRelatedToDebtFinancingMember_lbl" xml:lang="en-US">Risks Related to Debt Financing [Member]</label>     
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_RisksRelatedToDebtFinancingMember" xlink:to="bxsl_RisksRelatedToDebtFinancingMember_lbl"/>  
<!-- [WMV6][XcpuxYn59dz7vgYynUDuwG7r97K2jUTysl7vcz0lJt/tSeJz73kx1cLt0ZFF2SK/vxBCY0vdSrY5AXbN+V5mCI1Jyp9EcIvK/Hk00KbAE8U/MDpgO40nH5TmodeRlm2DciLtBkbnDYo+feEHE1XnQBtl4TE3hW7hx4yBhleqWV9WvclOgHt2uaLwJr3MRZ39FR1BVwk1VRI+6ztroYAIE7thD/7CUOdgRbA2uV1J6XBdfqToWqDAu/TjuNSDSInL6l5Di/hPNhy3jQqYKgqKAHw5LEPVAy/3IXa7hxdlIcJvY47l1zNSt7jFV+gy2MLW8AmJATEfufl98FykeeOKkQ==] CSR-->     
    <loc xlink:type="locator" xlink:label="bxsl_FederalIncomeTaxRisksMember" xlink:href="bxsl-20250711.xsd#bxsl_FederalIncomeTaxRisksMember"/>   
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_FederalIncomeTaxRisksMember_lbl" xml:lang="en-US">Federal Income Tax Risks [Member]</label>  
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_FederalIncomeTaxRisksMember" xlink:to="bxsl_FederalIncomeTaxRisksMember_lbl"/>     
    <loc xlink:type="locator" xlink:label="bxsl_RisksRelatedToAnInvestmentInTheCommonSharesMember" xlink:href="bxsl-20250711.xsd#bxsl_RisksRelatedToAnInvestmentInTheCommonSharesMember"/>  
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_RisksRelatedToAnInvestmentInTheCommonSharesMember_lbl" xml:lang="en-US">Risks Related to an Investment in the Common Shares [Member]</label> 
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_RisksRelatedToAnInvestmentInTheCommonSharesMember" xlink:to="bxsl_RisksRelatedToAnInvestmentInTheCommonSharesMember_lbl"/>    
    <loc xlink:type="locator" xlink:label="bxsl_NetInvestmentIncomeMember" xlink:href="bxsl-20250711.xsd#bxsl_NetInvestmentIncomeMember"/>    
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_NetInvestmentIncomeMember_lbl" xml:lang="en-US">Net Investment Income [Member]</label>  
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_NetInvestmentIncomeMember" xlink:to="bxsl_NetInvestmentIncomeMember_lbl"/> 
    <loc xlink:type="locator" xlink:label="bxsl_NetRealizedCapitalGainsMember" xlink:href="bxsl-20250711.xsd#bxsl_NetRealizedCapitalGainsMember"/>  
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_NetRealizedCapitalGainsMember_lbl" xml:lang="en-US">Net Realized Capital Gains [Member]</label> 
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_NetRealizedCapitalGainsMember" xlink:to="bxsl_NetRealizedCapitalGainsMember_lbl"/>    
    <loc xlink:type="locator" xlink:label="bxsl_CommonSharesMember" xlink:href="bxsl-20250711.xsd#bxsl_CommonSharesMember"/>     
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_CommonSharesMember_lbl" xml:lang="en-US">Common Shares [Member]</label>  
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_CommonSharesMember" xlink:to="bxsl_CommonSharesMember_lbl"/>  
    <loc xlink:type="locator" xlink:label="bxsl_PreferredSharesMember" xlink:href="bxsl-20250711.xsd#bxsl_PreferredSharesMember"/> 
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="bxsl_PreferredSharesMember_lbl" xml:lang="en-US">Preferred Shares [Member]</label>   
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="bxsl_PreferredSharesMember" xlink:to="bxsl_PreferredSharesMember_lbl"/>   
  </labelLink>     
</linkbase>
