Developer: Kling AI | Free Plan: Yes ($0/month, watermarked, 1080p) | Starting Price: $6.60/month billed annually (Standard plan); Developer API packages from $700 for 5,000 units | Best For: Content creators and filmmakers needing character-consistent AI video with native audio, and developers integrating video generation via API

Developer: Runway AI, Inc. | Free Plan: Yes ($0, 125 one-time credits) | Starting Price: $12/month billed annually (Standard plan); Developer API from $0.05/second (Gen-4 Turbo) | Best For: Filmmakers and creators wanting model choice across Runway's own and third-party video models, and developers integrating video generation via API

Developer: Google DeepMind | Free Plan: No standalone free tier (bundled into paid Google AI plans) | Starting Price: $7.99/month (Google AI Plus); Gemini API from $0.05/second (Veo 3.1 Lite) | Best For: Google Workspace/Gemini users wanting native-audio video, and developers needing resolution-flexible, per-second billed generation

Developer: OpenAI | Free Plan: No (requires ChatGPT Plus or Pro) | Starting Price: $20/month (ChatGPT Plus); Developer API from $0.10/second (Sora 2) | Best For: ChatGPT subscribers wanting native-audio AI video, and developers needing short-term API access before the September 2026 shutdown