The government has said it will act after Thailand scored 33 out of 100 and ranked 116th in the latest Corruption Perceptions Index (CPI).
Prime Minister Anutin Charnvirakul reacted by calling the ranking "a failing grade".
He said on Thursday that the score was relatively low, indicating high levels of corruption and weak transparency in the country.
He added that he had asked the Public Sector Anti-Corruption Commission (PACC) to clarify the factors behind the low score.
Following the discussion, Mr Anutin said the PACC chief outlined measures to address the issue. These may include revising existing laws and ministerial regulations or drafting a new bill to strengthen law enforcement.
Mr Anutin said corruption extends beyond bribery and includes inefficiencies in approval and licensing systems that undermine investor confidence.
He called for urgent enforcement of business facilitation laws and assigned agencies to coordinate efforts to enhance transparency.
Transparency International released the 2025 CPI results on Tuesday. Thailand's score fell by one point from the previous year.
