Saudi Arabia and the United Arab Emirates maintain deep institutional ties as GCC members under a joint defense agreement, with ongoing coordination on security threats including Houthi attacks and regional escalation. Recent developments, such as September 2026 ministerial phone calls emphasizing unified Gulf positions, public affirmations of fraternal relations, and visits like the Saudi Hajj minister’s trip to the UAE, underscore continued diplomatic and practical cooperation despite divergences over Yemen proxies, OPEC exit, Sudan, and oil policy. Traders assign a 95.8% probability to no severance because these shared frameworks and mutual interests in stability have contained rifts without rupture. A major proxy escalation or breakdown in GCC mechanisms could still shift odds, though current evidence points to managed competition rather than diplomatic rupture.