Williams has released images of its Mercedes-powered FW38, ahead of the first pre-season test in Spain next week.
Williams, which finished third in the 2015 standings, will publicly unveil its car in the pit lane at the Circuit de Barcelona-Catalunya on Monday but released images online on Friday morning.
"Williams has started to cement our position back amongst the front running teams after finishing third in the Championship in the past two seasons," said Team Principal Sir Frank Williams.
"This has been a great achievement given the resources of those around us. Staying where we are will be a challenge in itself, but we are determined to keep improving because only winning will ever be good enough.
"We have a very stable team going into 2016, with Felipe [Massa] and Valtteri [Bottas] teaming up for a third successive season. They work well together and both have the ideal blend of speed and consistency.
"Our technical team has also remained very consistent which will be to our advantage and we have some of the best engineering minds on the grid at our disposal.
"We have a busy couple of weeks of testing coming up to learn more about our package and to refine the car ahead of the first race.
"We will have to wait until Melbourne to find out exactly where we stand in the pecking order but I’m confident that our hard work over the winter will stand us in good stead."