"I'm comfortable with my job, but I'm exploring my options".
This is all you have to say. You are not the only one. For challenging positions, your recruiter probably has a table of 30-100 leads (candidates), and one of the fields in that table is "Actively looking / considering / not looking". Some break it down further, not most.
When you're marked as "considering", this is what it tells the recruiter:
- You will not take a bottom-end salary
- You'll probably want growth of some kind
- You might still be available even in 100+ days
- They should always present options B and C alongside you
If you're firm enough to mark yourself as "not looking", which means:
- Only approach this candidate if they have rare skills, experience with a specific company, etc.
- Check next year if their status is the same
LinkedIn even has a choice: actively looking / open to opportunities / not looking. This middle option is very common. Most successful pros are happy with their job.
As an alternative approach, if you simply want to know what other companies are offering, but won't take it however good it is (e.g., religions and governments aren't an open market), there's Glassdoor and other sites that deal in just this kind of information without the hassle of interviews.