According to Sam Altman on Twitter, ChatGPT now accurately follows specific user custom instructions, such as not using em-dashes in responses. This improvement enhances user control over AI-generated content formatting, making the tool more adaptable for business communication, content creation, and enterprise AI applications (source: @sama on Twitter, Nov 14, 2025). The update highlights OpenAI's commitment to user feedback and paves the way for more granular customization, which is critical for businesses seeking consistent brand voice and compliance in AI-generated outputs.