ChatGPT

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
• 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.