GPT-4o and GPT-4 are both OpenAI models, but they're significantly different. GPT-4o (released May 2024) is the 'omni' version — faster, cheaper, and capable of processing text, images, and audio natively.
Speed is the biggest difference. GPT-4o generates responses roughly 2x faster than GPT-4. In real-world usage, this means less waiting and more productive conversations.
GPT-4o is also natively multimodal. While GPT-4 could process images through a separate module, GPT-4o understands images, text, and audio in a single unified model. This makes it better at tasks combining multiple modalities.
Cost-wise, GPT-4o is roughly 50% cheaper through the API compared to GPT-4. This efficiency is one reason platforms like 4omodel.com can offer free access — the model is powerful but economical to serve.
For end users, GPT-4o feels more conversational and responsive than GPT-4. The responses are warmer and more natural, which is why many users specifically seek out GPT-4o over other models. You can try it free at 4omodel.com.