Renault says it is wary that progress needs to be made despite securing Red Bull securing its best result of 2015 at the Hungarian Grand Prix.
Daniil Kvyat claimed a career-best second position while Daniel Ricciardo was third to return the Renault-powered team to the podium places.
"Our never-say-die attitude has paid off," said director of operations Remi Taffin.
"Not only has our reliability improved and taken us to the end of the race, but our performance has also stepped up so that we are able to fight at the front.
"We know we still have a lot of work to do, but this strong result before the summer break is a real achievement.
"We know where we are going and realise that there is still some more progress to be made in order to achieve these results on a regular basis.
"But, for the second part of the season, we look forward to showing off the progress we have made so far."