Committed vs aspirational OKRs
A committed OKR is one you expect to fully achieve, and missing it is a real problem. An aspirational or stretch OKR is deliberately ambitious, where strong partial progress counts as success. The distinction only works if the label is agreed when the goal is set, not applied afterwards to explain a miss.

Why the label has to come first
A stretch target announced after the result is a defence. A stretch target agreed before the quarter is a contract about how the outcome will be judged, and that changes the behaviour of everyone involved.
Without the up-front label, every goal is implicitly committed, and teams respond exactly as you would expect: they set targets they are sure they can hit. You end up with a portfolio of certainties and wonder where the ambition went.
Getting the mix right
Most teams need both. Committed goals cover the things the business genuinely depends on this quarter. Aspirational goals cover the bets, where the useful outcome might be an answer rather than a number.
A portfolio that is entirely committed is a plan, not a strategy. A portfolio that is entirely aspirational means nothing is actually promised, which is its own kind of unaccountable.
The rule that makes it hold
No bonus attaches to either kind of goal number, and aspirational goals in particular must never be near compensation. The moment they are, the stretch quietly becomes a commitment in everybody’s head and the label stops meaning anything.
What is the difference between committed and aspirational OKRs? +
A committed OKR is expected to be fully achieved and a miss is a genuine problem. An aspirational OKR is deliberately ambitious, and strong partial progress counts as success. The label must be agreed when the goal is set.
Should aspirational OKRs affect pay? +
No. Attaching pay to a stretch target turns it into a commitment in practice, whatever the label says, and you will get conservative targets from then on.