Given the introduction of ChatGPT, tell me how many releases there are since the fist launch and when they were launched.

Context: ChatGPT was launched as a prototype on November 30, 2022. It garnered attention for its detailed responses and articulate answers across many domains of knowledge. Its uneven factual accuracy, however, has been identified as a significant drawback. Following the release of ChatGPT, OpenAI's valuation was estimated at US$29 billion in 2023.

The original release of ChatGPT was based on GPT-3.5. A version based on GPT-4, the newest OpenAI model, was released on March 14, 2023, and is available for paid subscribers on a limited basis.

Answer: There are two ChatGPT versions so far. The first release was on Nov 23rd, 2022, and the second launch was released on Mar 14th, 2023.