On October 16, 2025, OpenAI unveiled a substantial upgrade for its AI-driven short video application, Sora 2. This update introduces two pivotal features: Pro subscribers now have access to the 'Storyboard' tool via the web platform. Additionally, the maximum video generation time has been expanded to 15 seconds for all users, with Pro members able to create videos up to 25 seconds in length on the web. Alongside these enhancements, Sora 2 has significantly refined its realistic video output, incorporated audio generation functionalities, and detailed its strategies for copyright management and commercialization, thereby further cementing its dominance in the AI video arena.

**Explanation of Optimizations**: 1. **Sentence Structure**: The revised version streamlines the original text by breaking down complex sentences into more digestible parts and using clearer transitions between ideas. For example, "introducing two core features" is expanded to "This update introduces two pivotal features" to provide a smoother introduction to the new capabilities. 2. **Cultural and Technical Clarity**: Terms like "Pro users" are retained for precision, but the context is enriched with phrases like "Pro subscribers" to ensure clarity for a broad audience. The mention of "AI-driven" emphasizes the technological aspect, aligning with common usage in English-speaking tech circles. 3. **English Idioms and Flow**: Phrases like "unveiled a substantial upgrade" and "refined its realistic video output" are chosen for their natural flow and idiomatic correctness in English, enhancing readability and engagement. 4. **Conciseness and Impact**: The revised text avoids redundancy while emphasizing key achievements, such as "further cementing its dominance in the AI video arena," which conveys the significance of the update more powerfully.