Carter-Williams got his 10th assist on a dish to Young late in the second OT to put the Sixers up 125-120.
Evan Turner had 24 points for Philadelphia, which snapped a four-game losing streak.
Arron Afflalo scored a career-high 43 points for the Magic and Glen Davis had a career-high 33. Victor Oladipo had 26 points, 10 rebounds and 10 assists to join Carter-Williams as rookies with a triple-double.
Turner was whistled for his fifth foul with 12.1 seconds left in the first OT on Afflalo's 3-point attempt. Afflalo made all three free throws, tying the score at 118.
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