Runway

Runway Gen-4 Turbo leads in stylized and VFX-oriented AI video generation, with the most mature professional API in the field. Its Characters product — a real-time avatar API built on the GWM-1 world model — targets enterprise applications in customer support, training, and branded content. Runway closed a $315M Series C in February 2026 at a $5.3B valuation. See the AI Video Stack for current specs.