Formal:
* "Sarah graduated summa cum laude from Harvard University, earning a degree in astrophysics."
* "The university awarded the prestigious scholarship to the student who graduated summa cum laude with a perfect GPA."
Informal:
* "My brother, the overachiever, graduated summa cum laude from college, which is pretty impressive."
* "Despite her young age, she already holds a degree summa cum laude from Stanford."
In a professional context:
* "I graduated summa cum laude with a degree in computer science and have been working in software development for five years."
* "As a summa cum laude graduate of a top-tier university, I am confident in my ability to contribute significantly to your team."
Remember that "summa cum laude" is a Latin phrase, so it's usually used formally. In more informal situations, you could simply say "graduated with highest honors" or "graduated top of the class."