| Cover | May 09, 2024 |
| Entity Addresses [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 09, 2024 |
| Entity File Number | 001-40583 |
| Entity Registrant Name | Oklo Inc. |
| Entity Central Index Key | 0001849056 |
| Entity Tax Identification Number | 86-2292473 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 3190 Coronado Dr. |
| Entity Address, City or Town | Santa Clara |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95054 |
| City Area Code | 650 |
| Local Phone Number | 550-0127 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | OKLO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
| Entity Information, Former Legal or Registered Name | AltC Acquisition Corp. |
| Former Address [Member] | |
| Entity Addresses [Line Items] | |
| Entity Address, Address Line One | 640 Fifth Avenue, 12th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10019 |
