ChatGPT is OpenAI's conversational AI assistant. The model that started the generative AI revolution, evolving from GPT-3.5 to GPT-4o with multimodal capabilities.
April 24, 2026
GPT-5.5 is described as OpenAI's smartest model yet, offering faster performance and increased capabilities. It is built for complex tasks including coding, research, and data analysis across tools.
September 12, 2024
Reasoning model that thinks before answering. Excels at complex math, science and coding problems.
May 13, 2024
Omni model. Faster and cheaper than GPT-4. Real-time audio and vision. Emotional voice responses.
March 14, 2023
Massive capability jump. Multimodal inputs introduced. Passed bar exam in top 10 percentile.
November 30, 2022
Initial ChatGPT launch. Shocked the world with conversational AI. Reached 1 million users in 5 days.