Kling AI vs Runway Gen-3 vs Luma Dream Machine: The 2026 AI Video Generation Shootout (Motion Physics, Credit Burndown & Camera Choreography)

A practitioner-grade benchmark comparing Kling AI, Runway Gen-3 Alpha, and Luma Dream Machine Ray 2. We stress-test 3D spatio-temporal physics, 6-trajectory motion brushes, real-world credit burn rates, and camera trajectory controls.