OpenAI fixes ChatGPT's em dash problem; 'small-but-happy-win' says Sam Altman

OpenAI has resolved ChatGPT's overuse of em dashes. Users can now instruct the chatbot to avoid them with success. New GPT-5.1 models, Instant and Thinking, are rolling out. ChatGPT also gains new personality settings like Professional and Quirky. These updates aim for smarter, more conversational AI experiences for all users.