GPT-4 (Generative Pre-trained Transformer 4) is a large language model with multimodal capabilities created by OpenAI.


OpenAI has not publicly revealed information about GPT-4's architecture, but it is rumored to be a mixture-of-experts model. Some versions of GPT-4 can input images, and some versions have at least a 32k token context window.


The first variant of GPT-4 to be released to the public was via Bing on February 7, 2023.

chatGPT-4 was officially released by OpenAI on March 14, 2023.

The GPT-4 base model is not publicly accessible but some researchers have been given access.


base model


The GPT-4 base model (gpt-4-base on the API) is the inframodel of GPT-4, trained with pure self-supervised learning. So far, only a small number of researchers outside OpenAI have been granted access to it.

GPT-4 early


GPT-4 early is a version of GPT-4 referenced in several OpenAI and Microsoft publications. It is likely to be an earlier and separate RLHF training run than chatGPT-4. It likely to be related to the model that powers Bing, as its outputs exhibit Binglish artifacts. Evidence also suggests that this model is called Davinci 3 (DV3).



ChatGPT-4 (aka cGPT-4, gpt-4 on the API, and commonly synecdochally referred to as GPT-4 or ChatGPT) is a variant of GPT-4 tuned with RLHF released by OpenAI on March 14, 2023.



fanw-json-eval is an undocumented model that was briefly accessible to some or all users on OpenAI's completion API, between October 23rd and 27th 2023. fanw-json-eval is likely to be a variant of ChatGPT-4, as it behaves nearly indistinguishably from ChatGPT-4 while simulating an assistant in the chatML format. However, it was accessed through the completion rather than chat API and exhibited odd default behaviors.


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