PurposeThe Group of Twenty (G20) has substantial influence in global economic policy but has been peripheral in global education governance. There is intensification of education policy-relevant engagement within the Think 20 (T20), the “ideas bank” and official engagement group of the G20. The authors analyse the evolution of education as a policy domain within the T20, the ideas and discursive framing of education and global education policy “solutions” and assumptions about the G20 in education policy engagement.Design/methodology/approachThe authors view the T20 as an external actor that can mobilise policy-relevant ideas to G20 actors responsible for internal policy selection and translation. The analysis covers the period 2018–2021 when education became an explicit T20 policy area. The authors screened all 461 T20 policy briefs across all domains. Of these, 32 briefs and four final T20 Summit communiqués were reviewed using critical discourse analysis. Data were supplemented via organisational websites and tacit professional knowledge.FindingsThree assumptions on the G20 as an actor prevailed: (1) policymaker, (2) policy shaper and (3) knowledge mobiliser. The framing ideas on education were linked to assumptions on drivers of education system reform as intertwined with, or to enable: (1) economic adaptation, (2) technical adaptation and (3) socio-political adaptation of individuals and societies.Originality/valueAccelerated education engagement within the T20 and its direct reach to G20 leaders makes it, and the G20, analytically unique and new unexamined actors of potential influence. The authors conclude that the T20 is positioned as a unique actor, both that can mobilise education policy-relevant ideas to G20 leaders, and legitimised as the actor from which G20 leaders and policymakers should adopt ideas.