Osuna and his agent had filed at $5.8 million.
The 22-year-old right-hander still earned a hefty raise from last year’s $552,400 base salary.
Osuna was an all-star in 2017, pitching to a 3.38 ERA and 1.74 FIP in 66 appearances. He registered 39 saves on the year, but also blew an MLB-high 10.
Toronto figures to lean heavily on Osuna once again this year, especially after trading reliable bullpen arm Dominic Leone to the St. Louis Cardinals as part of the Randal Grichuk trade.
Starting pitcher Marcus Stroman is the only other Blue Jays player currently waiting for the arbitration process to play out. Stroman filed at $6.9 million while Toronto countered at $6.5 million.