OPT vs STEM OPT vs Cap-Gap vs 60-Day Grace Period

Who this is for: F-1 students who use these four phrases as if they were the same extra time.

This is a planning guide, not legal advice. Mixing these clocks is how people work without authorization or miss cap-gap.

Previous: OPT, STEM and H-1B key dates · Lottery and cap-gap · Unemployment 90 vs 150

Main guide: H-1B lottery and cap-gap

Rule watch (F-1 duration of status): DHS published a final rule on July 17, 2026, effective September 15, 2026, that would shorten the post-completion grace period from 60 to 30 days for students admitted after the effective date, shorten the post-program-end OPT filing window from 60 to 30 days, and require Form I-539 for some extensions. A federal court postponed the rule on September 14, 2026, so the current rules described here still apply. Re-check with your DSO before you file.

OPT, STEM OPT, cap-gap and grace: four different clocks

Students ask how STEM OPT, the grace period and cap-gap differ. The wrong forum answer can cost a year.

Four products:

Name	What it is	Work?
Post-completion OPT	Up to 12 months EAD after the degree	Yes, with valid EAD, related job, unemployment ≤90
STEM OPT	Extra 24 months EAD if CIP + E-Verify + I-983 + timely I-765	Yes, with STEM rules, unemployment ≤150 once STEM is in effect
Cap-gap	Automatic extension of F-1 + OPT EAD to April 1 (or H-1B start, if earlier) in a narrow H-1B fact pattern	Yes, if you actually have cap-gap
60-day F-1 grace	Time to leave / change after F-1 ends	No work

Quick answer: OPT vs STEM vs cap-gap vs grace

OPT is work authorization you applied for.
STEM is more OPT, not a different visa.
Cap-gap is a bridge to the H-1B start (April 1 at the latest) after a timely cap-subject COS petition.
Grace is a departure lounge.

You cannot stack grace on top of cap-gap to work in October without H-1B. You cannot use grace to file into cap-gap. You cannot treat pending STEM as 150 unemployment days.

Side-by-side

	Post-completion OPT	STEM OPT	Cap-gap	60-day grace
How you get it	I-765 (c)(3)(B) + DSO	I-765 (c)(3)(C) + I-983	Operation of law if rules met	Operation of law after F-1 completion/OPT end in many cases
Typical length	≤12 months	+24 months	Through April 1 (or H-1B start)	60 days
Form	I-765	I-765	No extra EAD card required in classic cap-gap	None
Work	Yes if EAD valid	Yes if STEM EAD / valid extension	Yes if cap-gap applies	No
Unemployment clock	90 days	150 total if STEM in effect	Still OPT rules	N/A — you must not work
H-1B lottery	Platform for March	Extra Marches	Covers summer after filed petition	Not a filing platform
Travel	Risky; docs needed	Same	Usually do not if COS pending	Do not treat as re-entry plan

Details: STEM OPT extension, H-1B lottery and cap-gap, travel on OPT and cap-gap.

Sequences that are legal vs folklore

Often true (still confirm):

OPT → timely STEM I-765 → work up to 180 days pending → STEM EAD → later cap-gap if lottery + timely I-129
OPT → lottery selected → I-129 filed while OPT valid → cap-gap to H-1B start (April 1 at the latest) → H-1B Oct 1
OPT/STEM ends → 60 days to leave or change — unemployed, not working

Folklore:

“Grace is extra OPT”
“I’ll file H-1B in grace and get cap-gap”
“Pending STEM already gives me 150 days”
“Cap-gap is a visa stamp”
“STEM grace is 60 extra unemployment days”

Unemployment vs grace vs cap-gap (the mix-up)

Clock	Counts as	If you exceed / misuse
Unemployment on OPT	Days without qualifying work while on OPT	Out of status
Extra 60 on STEM	Only after STEM is in effect	Do not borrow them early
Grace	Status to wrap up, not OPT	Work = unauthorized
Cap-gap	Extended OPT EAD	If you never qualified, you are in grace or worse

See OPT unemployment days.

Cap-exempt and CPT are not a fifth column on this table

Cap-exempt H-1B: different start-date logic (cap-exempt H-1B)
CPT: student work during a program, not post-completion OPT (Day-1 CPT and H-1B)

Do not put them in the same four-clock widget without a separate mode.

“Can I work today?” decision order

Do I have an unexpired EAD (or valid cap-gap / valid STEM-pending 180-day fact pattern)?
Am I in grace? If yes → no.
Is the job related and reported (STEM: I-983 current)?
Unemployment days left?
If summer after lottery: was I-129 filed on time for cap-gap?

If step 1 is a maybe, do not work. Ask DSO.

Common mistakes: OPT vs STEM vs cap-gap vs grace

Working week 1 of grace
Assuming cap-gap because they registered in March
Counting STEM unemployment during pending STEM
Travel in cap-gap COS (travel on OPT and cap-gap)
Using Day-1 CPT as if it were STEM (Day-1 CPT and H-1B)

FAQ: OPT vs STEM vs cap-gap vs grace

Is cap-gap the same as STEM?
No. STEM is a 24-month EAD category. Cap-gap is a seasonal bridge after an H-1B filing.

Do I get 60 days after cap-gap if H-1B is denied in September?
Status after a denial is fact-specific and ugly. Do not work. Call counsel/DSO that week.

Can grace restart after STEM?
You typically get a grace when that F-1 period ends. It is still not work authorization.

Does the 180-day STEM pending period count as cap-gap?
No. Different rule, different form.

Official sources

Rules change. Check these primary sources before you act:

Series so far

F-1 OPT to H-1B timeline 2026–2027
STEM OPT, I-983, reporting
H-1B lottery, cap-gap, if you lose
When to file I-765 (90-day window)
Unemployment days 90 vs 150
Changing STEM employers
I-983: what SEVP checks
6/12/24-month reports
Asking “do you sponsor H-1B?”
STEM CIP codes
Travel on OPT, STEM, cap-gap
Day-1 CPT and H-1B risk
Cap-exempt H-1B
H-1B RFEs: specialty occupation and LCA
Document checklist
OPT, STEM and H-1B key dates
This article
COS vs consular processing
OPT EAD delayed
20 hours, unpaid, 1099
Self-employment / startups
E-Verify for STEM
STEM I-765 denied
U.S. master’s cap vs regular cap

Educational information for F-1 OPT students planning employer-sponsored H-1B. Not legal advice. Not affiliated with USCIS, DHS, DOL, or any university. Immigration rules change; confirm with your DSO and a licensed attorney before acting.