ChatGPT
App surface by OpenAI · site · lifecycle docs
ChatGPT is a chatbot app by OpenAI released in November 2022.
Models
ChatGPT has been a surface for numerous large language models, many of which aren’t listed here.
Default models
- May 2024: GPT-4o
Since August 2025, new models of the “Instant” class are the default in ChatGPT’s model picker.
Model aliases
| Family | API aliases | Released | API deprecated | API retired | ChatGPT retired |
|---|---|---|---|---|---|
| GPT-3.5 | (todo) | ||||
| GPT-4 | (todo) | ||||
| GPT-4o | chatgpt-4o-latest | 2024-08-151 | 2025-11-18 | 2026-02-17 | 2026-02-13 |
| GPT-5 | gpt-5-chat-latest | ||||
| GPT-5.1 | gpt-5.1-chat-latest | ||||
| GPT-5.2 | gpt-5.2-chat-latest | ||||
| GPT-5.3 | gpt-5.3-chat-latest | ||||
| GPT-5.4 | N/A |
On May 5, 2026, “Chat Latest” was released on the API as a model alias that always points to the latest Instant model snapshot used in ChatGPT.