"We have signed a document to reinforce our cooperation," Angel Gurria, secretary general of the Organization for Economic Co-operation and Development told reporters at its Paris headquarters.
Speaking alongside him, Tsipras said that working with the OECD on its reform programme "will be our passport to creating trust with our partners."
He joked that he felt "more comfortable" visiting the OECD "than some other institutions, especially the old troika," referring to its group of creditors -- the European Central Bank, European Union and International Monetary Fund -- whose team of auditors became hated in Greece.
This month alone, Greece must find some USD 7.0 billion to meet its debts -- including 1.5 billion euros to the IMF.
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Gurria said they had discussed a wide range of reforms, including taxation, anti-corruption measures, boosting job creation and breaking the cartels that have a stranglehold on key parts of the Greek economy.
He emphasised that the new partnership should not be seen as the OECD replacing other international partners.
"The OECD has committed to offering the necessary technical assistance so these reforms are implemented in an effective way, both financially and socially.