This study looks at how well a new injection called GZR4 works compared to a daily insulin called insulin degludec for people with type 2 diabetes mellitus (T2DM). T2DM is a condition where your body doesn't use insulin properly, and insulin helps control blood sugar levels. The study is for people who haven't been able to control their diabetes well with pills or a combination of pills and insulin.

• **Study Length**: Participants will likely need to visit the clinic regularly for a specified timeline.
• **Compensation**: There may be compensation for participating in the study.
• **Risks**: As with any study, there may be risks such as side effects or reactions.

People can join if they are between 18-75 years old, have a specific body mass index (BMI), and have had T2DM for at least six months. They can't join if they have certain health conditions or are pregnant. This study aims to help find better ways to manage diabetes safely and effectively.