Same words, different tests
O-1A is a temporary work visa for individuals of extraordinary ability in the sciences, education, business or athletics. EB-1A is a permanent residence category. Both use the phrase "extraordinary ability", and both work from a criteria list — three of eight for O-1A at 8 CFR 214.2(o)(3)(iii), three of ten for EB-1A at 8 CFR 204.5(h)(3).
The lists overlap heavily. Both include authorship of scholarly articles, judging the work of others, original contributions of major significance, and published material about the person. Someone assembling evidence for one is largely assembling it for the other.
What differs is what the evidence has to prove. O-1A is tied to specific US work over a defined period and requires a petitioner and, ordinarily, a consultation from a peer group or labor organisation. EB-1A asks you to show sustained national or international acclaim and that you are among the small percentage at the very top of the field — a durable claim about standing, not a claim about a particular job.
An approved O-1 is useful context in an EB-1A petition. It is not evidence that the EB-1A standard is met — the two are adjudicated separately.
Why an O-1 approval does not carry over
Each petition is adjudicated on its own record. An officer reviewing an EB-1A does not inherit the earlier finding, and the permanent category is generally understood to apply the more demanding standard. Treating an O-1 approval as a foregone conclusion for EB-1A is one of the more expensive assumptions in this area.
The practical consequence is about timing. Many researchers use the O-1 period to build the record the EB-1A will eventually rest on — accumulating independent citations, taking on peer review invitations, publishing work that others build on. The O-1 buys the time; it does not substitute for the outcome.
Building one record that serves both
Because the criteria overlap, the sensible approach is to build evidence that satisfies the stricter reading and let the more lenient category take it as given. Concretely, that means placing work where your field will actually encounter and cite it, keeping documentation of every review invitation and editorial role as it happens rather than reconstructing it later, and preserving evidence of how others have used your work.
The failure mode we see most often is a record assembled backwards — someone decides to file, then looks for publications to point at. Evidence created in a hurry reads as evidence created in a hurry. Building deliberately over a longer horizon produces a record that holds up under either standard.