Greece's coalition leaders have sent written reform guarantees to European officials - a condition demanded for the release of €130bn in new loans.
Conservative leader Antonis Samaras said his party will "remain committed to the objectives, targets and key policies" if it wins the next election, expected in April.
The European Union, International Monetary Fund and the European Central Bank have demanded the reforms in return for a second €130bn bailout.
Socialist leader and former prime minister George Papandreou had previously sent his own pledge, his PASOK party said.
Eurozone finance ministers had cancelled planned face-to-face talks on the deal, saying they had yet to receive written pledges from party leaders to stick to punishing spending cuts, or clarification of all the savings.
A teleconference was held instead.
European officials have ratcheted up the pressure on the Greek government to deliver budget cuts in exchange for a second bailout as they insist default is not an option.
Greece needs to secure the new aid package to make a €14.5bn bond payment on 20 March to avoid a debt default.
European leaders are torn between pouring more aid into the struggling economy or risking an unprecedented national bankruptcy that might force the country out of the euro and prompt renewed market turmoil.
The decision was the result of an evaluation by the head of the eurogroup, Jean-Claude Juncker, who said there were insufficient elements of consensus to be sure that a meeting would be successful.
Greece lost credibility by missing targets for deficit reduction, economic reforms and asset sales that were set when it obtained a €110bn aid package in May 2010.
Meanwhile, the eurozone economy contracted less had been expected, new figures show today.
An unexpectedly robust performance by France partly offset chronic weakness across much of southern Europe.
The data shows the eurozone shrank by 0.3% in the final three months of last year, but grew by 1.5% for the year as a whole.
Tony Connelly: Greece struggles under bailout terms
