The Aussie was last at $0.6457, having climbed 1% overnight to a six-week top of $0.6472. That cleared the previous April peak of $0.6445 and left it a long way from the March trough of $0.5510.
The kiwi lagged a little, in part as speculation about further policy easing pushed bond yields to record lows. The kiwi stood at $0.6028, well above its March low of $0.5469 but short of the $0.6300 level held in early March.
Government bond yields had already been declining steadily as the RBNZ bought debt in the market and the 10-year yield hit a fresh all-time low on Tuesday at 0.753%.