Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	May 08, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	CARGO Therapeutics, Inc.
Document Period End Date	Mar. 31, 2024
Entity Central Index Key	0001966494
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity File Number	001-41859
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-4080422
Entity Address, Address Line One	835 Industrial Road
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	San Carlos
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94070
City Area Code	650
Local Phone Number	499-8950
Title of 12(b) Security	Common stock, par value $0.001 per share
Trading Symbol	CRGX
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		39,375,963