| Document and Entity Information | Jan. 28, 2025 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001966494 |
| Document Type | 8-K |
| Document Period End Date | Jan. 28, 2025 |
| Entity Registrant Name | CARGO Therapeutics, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-41859 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, par value $0.001 per share |
| Trading Symbol | CRGX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
