Background: Automated insulin delivery systems improve glycemic control including time spent in, below and above range (TIR, TBR and TAR, respectively) in people with T1D. A next generation system, the MiniMedTM AHCL system, that offers a target set point (SP) of 100 or 120mg/dL, autocorrects to 120mg/dL every 5 mins and has fewer Auto Mode exits, was evaluated. Methods: A 16-site, single-arm, in-home trial of the AHCL system in 39 adolescents (14-21yrs) and 118 adults (≥22yrs) with T1D was conducted. After a baseline period of sensor-integrated pump, HCL feature, or predictive low glucose feature use (~14 days), the AHCL feature was enabled with a 100 or 120mg/dL SP for ~45 days and then the other SP for ~45 days. Study endpoints included safety events, change in A1C, sensor glucose (SG), %TIR, %TBR and %TAR. Results: There were no DKA or severe hypoglycemia episodes during the study period. Auto Mode was used ≥95% of the time; autocorrection was 22% of daily bolus. The table shows outcomes (mean±SD) for the overall group and each age group at baseline and study period (100 and 120mg/dL SP), and at the 100mg/dL SP. Best glycemic results (SG of 141±8.8mg/dL, TIR of 78.8±5.5% and TBR of 2.6±2.0%; N=29) were seen with a 100mg/dL SP and active insulin time of 120 minutes. Conclusion: These pivotal trial data demonstrate that AHCL is safe and significantly improved A1C and SG in subjects aged ≥14 years with T1D.