OpenAI ChatGPT 4o is continually updated by OpenAI to point to the current version of GPT-4o used by ChatGPT. It therefore differs slightly from the API version of GPT-4o in that it has additional RLHF. It is intended for research and evaluation.
OpenAI notes that this model is not suited for production use-cases as it may be removed or redirected to another model in the future.
Recent activity on ChatGPT-4o
Total usage per day on OpenRouter
Prompt
90.6M
Completion
7.01M
Prompt tokens measure input size. Reasoning tokens show internal thinking before a response. Completion tokens reflect total output length.