You can evaluate the offer on its own terms without agreeing to stop other active recruiting unless you have actually made a commitment to do so.

A firm may encourage you to decide quickly, but your obligation depends on what you have formally accepted or signed. You should not misrepresent your status, but you also do not need to abandon other options simply because a recruiter prefers that outcome.

You can thank the recruiter, confirm the decision deadline, and continue another scheduled process while you evaluate both opportunities. If you accept the offer, then follow the commitments you make at that point.

Clarify the actual deadline and written terms. If you need more time, ask directly for an extension. Keep your communication truthful and professional with every firm involved.