AI Video Generation in 2025 — Models, Costs, and How to Build a Cost-Effective Pipeline
A comprehensive guide to AI video generation models — Sora, Veo 2, Kling, Runway Gen-3, Hailuo AI, Pika, and open-weight alternatives — covering per-second pricing, quality comparisons, and production strategies that cut costs by 80% using model tiering, image-to-video workflows, and smart stitching.