Gen-4 and Gen-4.5 Video Generation
Runway's flagship feature is its generative video models. Gen-4 Turbo is the fast, affordable option (5 credits/second) that's good for drafting and iteration. Gen-4 is the balanced workhorse (12 credits/second) with strong quality and motion consistency. Gen-4.5 is the top tier (25 credits/second), currently ranked first on the Artificial Analysis text-to-video benchmark for visual fidelity and realistic physics. The practical difference between models is significant. Gen-4 Turbo gets you 80% of the way there for 20% of the cost -- fine for social media clips and rough cuts. Gen-4.5 is noticeably better for complex scenes, realistic human movement, and cinematic lighting. Most creators use Turbo for testing prompts and Gen-4 or Gen-4.5 for final output. The jump from Gen-4 to Gen-4.5 is especially visible in skin textures, fabric movement, and water/particle effects.