v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Jun. 30, 2025
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Document Transition Report false  
Document Period End Date Dec. 31, 2025  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Entity File Number 001-40981  
Entity Registrant Name Cactus Acquisition Corp. 1 Ltd.  
Entity Central Index Key 0001865861  
Entity Tax Identification Number 00-0000000  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One 301 Carnegie Center Drive  
Entity Address, Address Line Two Suite 304  
Entity Address, City or Town Princeton  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08540  
City Area Code (609)  
Local Phone Number 495-2222  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
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  
Elected Not To Use the Extended Transition Period false  
Entity Shell Company true  
Entity Public Float   $ 22,164,380
Entity Common Stock, Shares Outstanding 3,214,738  
Documents Incorporated by Reference [Text Block] None  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] false  
Auditor Firm ID 1309  
Auditor Opinion [Text Block] We have audited the accompanying balance sheets of Cactus Acquisition Corp. 1 Limited (the “Company”) as of December 31, 2025 and 2024, and the related statements of operations, changes in capital deficiency and cash flows for the years then ended, including the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for the years then ended in conformity with accounting principles generally accepted in the United States of America  
Auditor Name Kesselman & Kesselman C.P.A.s  
Auditor Location Tel-Aviv, Israel  
Class A ordinary shares, par value $0.0001 per share    
Title of 12(b) Security Class A ordinary shares, par value $0.0001 per share  
Trading Symbol CCTSF  
Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50    
Title of 12(b) Security Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50  
Trading Symbol CTSWF  
Units, each consisting of one Class A ordinary share and one-half of a redeemable warrant    
Title of 12(b) Security Units, each consisting of one Class A ordinary share and one-half of a redeemable warrant  
Trading Symbol CTSUF  
Common Class A [Member]    
Entity Listing, Par Value Per Share $ 0.0001  
Common Class B [Member]    
Entity Listing, Par Value Per Share $ 0.0001