v3.25.4

Cover	Feb. 23, 2026
Document Type	8-K
Amendment Flag	false
Document Period End Date	Feb. 23, 2026
Current Fiscal Year End Date	--12-31
Entity File Number	001-43139
Entity Registrant Name	ClearThink 1 Acquisition Corp.
Entity Central Index Key	0002094073
Entity Tax Identification Number	00-0000000
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	150 E. Palmetto Park Road
Entity Address, Address Line Two	Suite 202
Entity Address, City or Town	Boca Raton
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33432
City Area Code	(561)
Local Phone Number	358-3696
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one right to receive one-fifth of one Class A ordinary share
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value, and one right to receive one-fifth of one Class A ordinary share
Trading Symbol	CTAAU
Security Exchange Name	NASDAQ
Class A ordinary shares, $0.0001 par value
Title of 12(b) Security	Class A ordinary shares, $0.0001 par value
Trading Symbol	CTAA
Security Exchange Name	NASDAQ
Rights, each entitling the holder to receive one-fifth (1/5) of one Class A ordinary share
Title of 12(b) Security	Rights, each entitling the holder to receive one-fifth (1/5) of one Class A ordinary share
Trading Symbol	CTAAR
Security Exchange Name	NASDAQ

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Address Line 1 such as Attn, Building Name, Street Name

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Address Line 2 such as Street or Suite number

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Name of the state or province.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

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Trading symbol of an instrument as listed on an exchange.

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Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Clearthink 1 Acquisition Corp. 8-K