Beyond the Vibe Shift: What Is Runway Gen-4.5 and Why It Changes AI Video

For years, generative AI video felt a bit like a magic trick performed through a foggy window. You could type a poetic description—“a cinematic shot of a neon-drenched cyberpunk street in the rain”—and cross your fingers. Sometimes you’d get a breathtaking masterpiece; more often, you’d get a swirling, uncanny-valley morph where cars melted into buildings and physics took a permanent vacation.