# ChatGPT

> A GPT-based chatbot service developed by OpenAI. Released on November 30, 2022.

A <GPT>-based chatbot service developed by <OpenAI>. Released on <November 30, 2022>.

## History

- 2022-11-30 - GPT-3.5
- 2023-03-?? - GPT-4.0
- 2023-03-22 - [Sparks of artificial general intelligence - Early experiments with GPT-4](https://wiki.g15e.com/en/pages/Sparks%20of%20artificial%20general%20intelligence%20-%20Early%20experiments%20with%20GPT-4.txt)
- 2024-05-?? - GPT-4o
- 2024-07-?? - GPT-4o-mini
- 2024-12-?? - o1
- 2025-02-?? - GPT-4.5
- 2025-04-?? - GPT-4.1
- 2025-04-?? - o3
- 2024-04-?? - o4-mini
- 2025-06-?? - o3-pro
- 2025-08-07 - GPT-5
- 2025-11-12 - GPT-5.1

## Notes

- <February 11, 2023>: I paid for a subscription for the first time.
- <November 15, 2025>: I started using the \$200-per-month Pro plan.