OpenAI has introduced the ChatGPT Pro subscription tier at $200 per month, aimed at power users and businesses needing extensive features and models. In contrast, the Plus subscription costs $20 per month, catering to individual users seeking improved performance. The new Pro tier provides unlimited access to all models, including advanced capabilities like Pro Mode for enhanced responses. OpenAI also launched its reasoning model, o1, during its "12 Days of OpenAI" event.