Cover - shares	9 Months Ended
	Sep. 30, 2024	Nov. 14, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-40583
Registrant Name	Oklo Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-2292473
Entity Address, Address Line One	3190 Coronado Dr.
Entity Address, City or Town	Santa Clara
Entity Address, State or Province	CA
City Area Code	650
Local Phone Number	550-0127
Entity Address, Postal Zip Code	95054
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	OKLO
Security Exchange Name	NYSE
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		122,096,270
Document Fiscal Year Focus	2024
Central Index Key	0001849056
Amendment Flag	false
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31