Tokyo's new Covid-19 cases have exceeded 20,000 for the first time, dimming hopes that an Omicron-fuelled wave of infections in Japan is peaking out, Reuters reports.

Nationwide cases have reached a record 91,760, while 18 prefectures recorded all-time highs, according to a tally by online news service JX Press.

Tokyo has reported 21,576 new cases, exceeding the previous record of 17,631 in Japan's capital on Friday.