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ByteDance, Runway and Luma Now Split the AI Video Market OpenAI Left Behind

Summary by Startup Fortune
OpenAI shut down Sora's app in April 2026 and its API on September 24, after burning roughly $1 million a day against just $2.1 million in lifetime revenue. Three rivals split the market it left behind: ByteDance's Seedance 2.5 for physics-level realism, Runway's Gen-4.5 for multi-shot character consistency, and Luma's Ray 3.2 for HDR exports that drop straight into professional post-production.
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Startup Fortune broke the news on Friday, September 18, 2026.
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