The figure, down from last month's pledge to cap expenditure at USD 17.78 billion, follows warnings that the bill for the 2020 Games could soar as high as USD 30 billion.
Organising committee chief executive Toshiro Muto yesterday said the entire Games budget will be between 1.6 trillion and 1.8 trillion yen, which he put at USD 15-16.8 billion.
Under the latest exchange rate, the same yen figure is worth USD 13.6-15.3 billion. This year's Rio Games cost USD 12 billion, while London 2012 came USD 13.7 billion under the exchange rate of the time.
It was revealed at talks between the Games' organisers, the International Olympic Committee (IOC) and the Tokyo and national governments, who are meeting regularly to try to cut costs.
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"This does give the overall picture," IOC vice-president John Coates said by videolink from Sydney.
"We are pleased with the progress you are continuing to make," he said, adding: "We think that we can work with you to find... More savings."
Tokyo governor Yuriko Koike, who was elected this year vowing to bring down costs, said some 40 billion yen would be saved after a review of the canoeing, volleyball and swimming venues.
In the battle to cut costs, she had proposed moving the canoeing 400 kilometres (250 miles) north of Tokyo to Miyagi prefecture, one of the areas hardest hit by Japan's 2011 tsunami disaster.
But the idea faced resistance from the organising committee, which argued that changing sites was impractical and could end up costing more.
Koike gave up the plan last month and announced that canoeing will stay in Tokyo as planned, but with the venue built at a sharply reduced cost.
But Coates refused to accept the figure and said overall costs would have to come down significantly.