However, Hernanes pounced with a header moments later to save Inter but, despite being eight points adrift, the Spaniard claims that a Scudetto is not yet beyond Napoli.
"We've already shown a year ago that we are able to fight at the top," Benitez, who led the Naples club to a third-placed finish last season, told Sky Sport Italia.
"I'm not disappointed with the draw but content with the reaction of the team at a difficult ground like this one [San Siro].
"I'm unhappy because we went ahead twice and twice we conceded right away but, overall, the second half pleased me."
The Partenopei lie seventh in the standings.