As of my latest knowledge, OpenAI makes several model families available to the public through ChatGPT and the API. The exact lineup changes over time, but here’s a practical overview of the main ones you’re likely asking about.

✨In ChatGPT
Public users may see different models depending on their plan:

- Free / Plus / Team / Enterprise
- GPT-4o: A fast, multimodal model that can handle text, images, and in some cases voice features in ChatGPT.
- GPT-4o mini: A lighter, cheaper, faster model for many everyday tasks.
- Reasoning models may also appear in some ChatGPT experiences, depending on rollout and plan.

✨In the API
Developers typically have access to models such as:

- GPT-4o
- Best all-around general model
- Good for text, vision, and interactive apps
- GPT-4o mini
- Lower cost, good for high-volume tasks
- Useful for classification, extraction, summarization, and chat
- Reasoning-focused models
- OpenAI has been rolling out models designed to spend more effort on reasoning for harder tasks. Availability and names can vary by release and account access.

🤖What these models are good for
- GPT-4o: strong quality, multimodal apps, assistants, coding help
- GPT-4o mini: cheaper production workloads, quick responses, routine automation
- Reasoning models: complex logic, multi-step planning, tougher analysis

🤖How to check what’s currently available
Because OpenAI updates model availability often, the best sources are:
1. ChatGPT model picker in your account
2. OpenAI API docs/model list
3. OpenAI dashboard for your API project

✨Simple rule of thumb
- Want the best general-purpose experience? Use GPT-4o
- Want lower cost and speed? Use GPT-4o mini
- Want harder reasoning? Look for the newest reasoning model available to your account

If you want, I can also give you:
1. a current model comparison table, or
2. a guide on which model to use for specific tasks like coding, summarization, vision, or agents.