Apologies for any confusion caused. As an AI language model, my responses are based on information available up to GPT-3, and I don't have real-time access to external websites or the ability to verify their content. If the provided link indeed states that GPT-4 is available, I would recommend checking out the OpenAI website for accurate and up-to-date information on their research advancements. They will have the most reliable information regarding GPT-4 and its availability. Let me know if there's anything else I can assist you with!