About California Institute of Technology. California Institute of Technology in Pasadena, CA reports an overall acceptance rate of 3.1%, an early-round acceptance rate of 6.0%, an SAT middle 50% of 1530–1570, a class size of 266, and a yield of 59.0% based on the most recent Common Data Set filings. Smallest elite university. Reinstated testing requirement for C/O 2029. Most STEM-focused school. No legacy preference.