Goku's speed and universal power scaling significantly exceed even the Asgardian thunder god.
Thor is one of the most powerful characters in Western comics โ but Dragon Ball's power scaling has gone so far beyond that it's hard to compare. Current Goku casually outputs energy at the universal scale, while Thor's peak feats, impressive as they are, typically cap at planetary to stellar levels.
Goku's speed advantage is the decisive factor. Ultra Instinct operates faster than conscious thought, while Thor, despite being incredibly fast for a god, doesn't display comparable speed feats. Goku could land dozens of universe-threatening strikes before Thor processes the first one.
Thor's divine magic is a wildcard โ Goku has limited experience fighting magic-based opponents, and enchanted attacks might bypass his ki-based defenses. But the raw power gap suggests Goku could simply overwhelm any magical defense through brute force.
Goku's power is universal-scale and his speed is millions of times lightspeed. Ultra Instinct is autonomous dodge that bypasses Mjolnir's tracking. The Saiyan scaling mechanic means even if Thor initially matches Goku, the gap widens every minute.
Mjolnir's magic-based attacks could bypass Goku's ki defenses. Thor has thousands of years of combat experience and divine resilience. The God-blast concentrates all of Thor's energy into a single attack that has staggered Galactus-tier beings.
Goku wins through overwhelming speed and power scaling. Thor is a magnificent warrior, but Dragon Ball's power creep has escalated beyond what Norse mythology (even comic-book Norse mythology) can match.
Goku also fights
Thor (Norse) also fights