Guide for ChatGPT Users: Choosing the Ideal OpenAI Model for Your Needs
OpenAI, the leading AI research company, has responded to user feedback by reintroducing the retired models GPT-4o and o3, just a week after the launch of their latest model, GPT-5. The move comes as a relief to many users who had expressed dissatisfaction with the changes brought about by GPT-5.
GPT-4o, initially launched in May 2024, and the o3 model, introduced in April 2025, were praised for their strong performance in a broad range of tasks, especially in STEM and coding. However, GPT-5, released on August 7, 2025, was criticised for its loss of creative spark and less satisfying user experience.
Sam Altman, CEO of OpenAI, acknowledged the controversy and announced that the company is re-opening access to a grab bag of older models. GPT-4o was re-added primarily for paid subscribers to offer users a familiar option alongside GPT-5. The o3 model, known for its powerful reasoning capabilities in coding, math, science, and visual analysis, is also back in the roster.
While GPT-5 boasts a unified architecture with smarter routing, faster speed, and superior accuracy on complex coding and multi-step problem-solving tasks, the user preference for the conversational style and personality of GPT-4o remains strong. OpenAI has committed not to retire valuable older models abruptly in the future, ensuring users retain choice and predictability in model availability.
Each model now comes with three "thinking modes" that change how fast (or slow) it responds: Auto, Fast, and Thinking. A "GPT Model and Mode Picker" is available to help users find their perfect AI match. The "GPT-5" model, the most advanced and capable, is suitable for a wide range of tasks. Use its Thinking mode for analysis and Fast mode for quick chats.
Moreover, rate limits have been introduced for GPT-5 Thinking mode, with paid users limited to 3,000 messages per week. Custom instructions can be set in profile settings to save time and repeated instructions.
The reintroduction of the retired models such as GPT-4o, GPT-4.1, o3, and others has resulted in more power but also more decisions to make for users. However, it provides users with the flexibility to choose the model that best suits their needs, whether it's the creative and conversational GPT-4o, the powerful reasoning o3, or the advanced and capable GPT-5.
The reintroduction of retired models like GPT-4o and o3, initially praised for their strong performance in STEM and coding, offers users the flexibility to choose from a variety of technology-based models, including the advanced and capable GPT-5. The innovative "GPT Model and Mode Picker" allows users to find the best AI match, giving them the power to select the model that best aligns with their specific technology needs.
