The Thunder (20-23) have won two straight, four of five, and completed a sweep of their season series against Chicago as they battle to climb from 11th place in the tightly-packed Western Conference.
Giddey said OKC's ability to shake off Chicago's third-quarter charge, went the hosts went on an 18-5 run to trail 91-90, shows how far their young core have come.
"Twelve months ago, if a team goes on a run like that, maybe we crumble a little bit more; maybe guys go into their shells," he said.
"Tonight guys stood up and were ready for the challenge ... We didn't flinch when they threw their punch."
Zach LaVine scored 25 points and Nikola Vucevic had 19 points and 11 rebounds as the Bulls lost their third straight.
In San Antonio, a NBA regular-season record crowd of 68,323 got to watch defending champions Golden State thrash the hosts 144-113 at the Alamodome.
The attendance shattered the previous regular-season record of 62,046 who watched Michael Jordan and the Chicago Bulls play the Atlanta Hawks at the Georgia Dome on March 27, 1998.
The Spurs normally play at the AT&T Center but returned to their former home as the franchise celebrates its 50th anniversary.
While returning to the Alamodome stirred fond memories for San Antonio coach Gregg Popovich and fans of the franchise's first NBA championship in 1999, reality wasn't as kind.
"It was pretty electric, a really special occasion playing in front of the largest crowd in NBA history ... I'm glad we got the win," Poole said after just Golden State's fourth success on the road from 20 games this season.
Elsewhere there were victories for New York, Atlanta, Minnesota, New Orleans, Utah, Denver and Sacramento.