ChatGPT (November 2022 research-preview model)
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ChatGPT was introduced as a free research preview on November 30, 2022. OpenAI describes its initial model as a GPT-3.5-series fine-tune trained for dialogue. The application launch does not identify an API snapshot or establish the GPT-3.5 API launch date.
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Initial public research preview with free usage, as described in the November 30 announcement. The record concerns the named dialogue-model launch; it is not a persistent current ChatGPT model, API alias or exact served checkpoint. Later access and retirement were not checked.