A "model" is like a version of a smart assistant, each with different levels of intelligence and capabilities. On the web you can see the available models to choose from in the UI when you start using ChatGPT:

It will depend on your use case. Here are the most common reasons to use each model:

The higher your plan type the more you can use our most advanced models.

See this section below about features and limits of those models by plan type for details.

* Image output (DALL·E capabilities) are available to all users on Plus, Team, and Enterprise plans in our GPT-4 and GPT-4o models. Image output is not available on the Free plan.

See Using ChatGPT's Free Tier - FAQ for details.

** All ChatGPT users have access to voice chats through our mobile app.

See Voice chat FAQ for details.

With Temporary Chat, you can have a conversation with a blank slate. ChatGPT won't be aware of previous conversations or access memories. It will still follow your custom instructions if they're enabled.

See our Temporary Chat FAQ for details.

GPT-4o is OpenAI's new flagship model that can reason across audio, vision, and text in real time.

GPT-4o will be available in ChatGPT and the API as a text and vision model (ChatGPT will continue to have support for voice via the pre-existing Voice Mode feature) initially. Specifically, GPT-4o will be available in ChatGPT Free, Plus, Team, and Enterprise, and in the Chat Completions API, Assistants API, and Batch API.

GPT-4o and GPT-4o mini are available to anyone with an OpenAI API account, and you can use the models in the Chat Completions API, Assistants API, and Batch API. Function calling and JSON mode are also supported. You can also get started via the Playground.

After you have made a successful payment of $5 or more (usage tier 1), you'll be able to access the GPT-4, GPT-4 Turbo, GPT-4o models via the OpenAI API.

Learn more about adding credit to your OpenAI account.

Current pricing in the API is available on our API pricing page.

GPT-4o has the same high intelligence but is faster, cheaper, and has higher rate limits than GPT-4 Turbo. Specifically:

GPT-4o currently has a context window of 128k and has a knowledge cut-off date of October 2023.

Please note that ChatGPT rate limits are independent of API rate limits. You can learn more about API rate limits here.

You can view your API rate limits in the limits section of the API Platform.

Please be patient though — we expect massive demand and will scale up and optimize our systems over the coming months.

As with the rest of our platform, data and files passed to the OpenAI API are never used to train our models unless you explicitly choose to opt in to training. You can read more about our data retention and compliance standards here.

Users on the Free tier will be defaulted to GPT-4o with a limit on the number of messages they can send using GPT-4o, which will vary based on current usage and demand. When unavailable, Free tier users will be switched back to GPT-4o mini.

Free users also receive limited access to messages using advanced tools through 4o, such as:

GPT-4o has advanced vision capabilities, which increases accuracy in understanding images you share.

Free tier users can use GPT-4o only a limited number of times within a five hour window. We’ll notify you once you’ve reached the limit and invite you to continue your conversation using GPT-4o mini or to upgrade to ChatGPT Plus.

Free tier users can upgrade to Plus at any time by clicking on ChatGPT:

ChatGPT Plus and Team subscribers have GPT-4 and GPT-4o access on chatgpt.com with a larger usage cap.

ChatGPT Plus and Team users will be able to select GPT-4o from the drop down menu at the top of the page:

As of May 13th 2024, Plus users will be able to send up to 80 messages every 3 hours on GPT-4o and up to 40 messages every 3 hours on GPT-4. We may reduce the limit during peak hours to keep GPT-4 and GPT-4o accessible to the widest number of people.

The GPT-4 and GPT-4o message caps for a user in a ChatGPT Team workspace is higher than that of ChatGPT Plus.

Please note that unused messages do not accumulate (i.e. if you wait 6 hours, you will not have 80 messages available to use for the next 3 hours on GPT-4).

The ChatGPT Enterprise plan is designed specifically to meet the needs of large enterprises, with unlimited, high-speed access to GPT-4o and GPT-4.

New conversations on a ChatGPT Enterprise account will default to GPT-4o. ChatGPT Enterprise users will be able to select other models from the drop down menu at the top of the page:

ChatGPT Enterprise also offers enterprise-grade security and privacy, longer context windows for processing longer inputs, unlimited, high speed access to advanced tools like data analysis, customization options, and much more.

If you'd like to purchase ChatGPT Enterprise for your organization, please reach out to our sales team. Under "Which of our products or services are you interested in? ", please specify "ChatGPT Enterprise".