Most students reduce OPT vs CPT to one line: CPT is during school and OPT is after graduation. That is partly true, but not enough. The important differences are authorization source, timing, employer flexibility, academic connection and how full-time CPT can affect OPT eligibility.
Before choosing a school, check your credit transfer, visa/status situation, work options, total cost and cashback eligibility.
Quick comparison
| Question | CPT | OPT |
|---|---|---|
| When is it used? | During the academic program. | Usually after completion, though pre-completion OPT exists. |
| Who authorizes it? | Your DSO authorizes it on your I‑20. | USCIS approves it and issues an EAD. |
| Employer link? | Employer/job is usually specific and tied to curriculum. | Can work for employers related to your field after approval. |
| Big risk? | 12+ months full-time CPT can remove OPT eligibility. | Unemployment days and application timing matter. |
When CPT makes sense
CPT can make sense when work is genuinely part of the program, directly related to your major and authorized before you begin. Day 1 CPT may fit some transfer students, but the school, curriculum and employer relationship need to be credible.
When OPT makes sense
OPT is usually the main post-graduation work bridge. It can help you gain experience, search for sponsorship and plan their next step. Because OPT is valuable, avoid careless full-time CPT use that can affect eligibility.