The USMLE introduced new test delivery software through 2026, and it reached the three Step exams at different times. Anyone working through the sequence over several years will meet it at different points, which is worth knowing rather than being surprised by.
The rollout
Step 3 first, for exams whose first day of testing fell on or after 10 March 2026. Step 1 by May 2026. Step 2 CK during the second quarter of the same year.
Taking Step 3 first makes sense operationally. It has the lowest volume of the three, which limits the blast radius if anything about a new interface behaves unexpectedly.
Where the numbers are public
Only for Step 3, and they are worth quoting because they are the clearest picture of what the change actually looks like.
Day 1 moved from six blocks of 38 to 39 items at 60 minutes each, to twelve blocks of 18 to 20 items at 30 minutes each. The day still runs about seven hours.
Day 2 moved from six multiple-choice blocks of 30 items at 45 minutes to nine blocks of 20 items at 30 minutes. The case simulations are unchanged and the day still runs about nine hours.
For Step 1 and Step 2 CK the programme has said the exams have more blocks and shorter blocks, with content, total items and overall length unchanged. It has not released per-block figures. Anyone quoting specific numbers for those two is inferring them.
What it means at each stage
Step 1. You will meet the new interface as your first real exam, with no previous version to unlearn. That is the easiest position to be in. Spend ten minutes on the official tutorial and set your practice block length to something short rather than the forty-item default.
Step 2 CK. If you sat Step 1 before the change, this is the first time the rhythm differs from what you rehearsed. The adjustment is small but real, and it is worth a couple of full-length practice sessions in the new shape rather than assuming the reflex transfers.
Step 3. The published change is largest here, and it lands during residency when practice time is scarce. Twelve blocks of twenty items is a different day from six of thirty-nine, and the interactive case component is unchanged, so the day now has two quite different rhythms in it.
The thing that does not change
Content. The outline, the total number of items and the length of the exam are the same. A new interface does not alter what is being assessed, and preparation that was working does not need rethinking.
What does deserve attention is that the pacing habit you build for one Step now carries forward more cleanly than it used to, because all three exams share the shorter-block shape. A question bank that lets you configure block length and keeps performance history across Step 1 and Step 2 CK makes that continuity easier to use; QBankly does both.
Practical advice
Check the current tutorial before each exam rather than assuming the interface is the one you remember. Software changes have arrived at different times for different Steps, and the gap between your exams may span a version.
Frequently asked questions
Does the rollout order mean anything?
Mainly that Step 3 has lower volume, which makes it a sensible place to introduce new software. It does not imply the exams differ in content.
Are the Step 1 block numbers published?
No. The programme has said only that there are more blocks and that they are shorter, with total items and overall length unchanged.