Shares remained near four-and-a-half year highs, pushed up by a fifth straight day of gains on Wall Street.
The market opened about 0.1 per cent higher, with mining stocks the best performers in early trade.
CMC Markets chief strategist Michael McCarthy said it was hard to predict where the market was heading in the short term, given the recent surge here and on overseas markets.
In response to Wall Street's rally this week, volatility in local trading had picked up, Mr McCarthy said.
“That tells us that the market is keen to make a break, but it is not clear in what direction,'' he said. “On the evidence this morning, it looks like the upside, but we've seen it flip around every day this week. So, it's a very tough time for investors.''
A fall in jobless claims in the US last week sent the Dow Jones Industrial Average to an all-time high for the third straight session overnight. The Dow added 33.25 points, or 0.23 per cent, to 14,329.49.