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Cover page
 12 Months Ended
Dec. 31, 2024
shares
Entity Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2024
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-41842
Entity Registrant Name Abivax SA
Entity Incorporation, State or Country Code I0
Entity Address, Address Line One 7-11 boulevard Haussmann
Entity Address, Postal Zip Code 75009
Entity Address, City or Town Paris
Entity Address, Country FR
Entity Common Stock, Shares Outstanding 63,347,837
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Amendment Flag false
Document Fiscal Year Focus 2024
Document Fiscal Period Focus FY
Entity Central Index Key 0001956827
Business Contact  
Entity Information [Line Items]  
Contact Personnel Name Marc de Garidel
Entity Address, Address Line One 7-11 boulevard Haussmann
Entity Address, Postal Zip Code 75009
Entity Address, City or Town Paris
Entity Address, Country FR
City Area Code +33
Local Phone Number 1 53 83 09 63
American Depositary Shares, each representing one ordinary share, nominal value €0.01 per share  
Entity Information [Line Items]  
Title of 12(b) Security American Depositary Shares, each representing one ordinary share, nominal value €0.01 per share
Trading Symbol ABVX
Security Exchange Name NASDAQ
Ordinary shares, nominal value €0.01 per share  
Entity Information [Line Items]  
Title of 12(b) Security Ordinary shares, nominal value €0.01 per share
Security Exchange Name NASDAQ
No Trading Symbol Flag true