OpenAI has collaborated with Retro Biosciences, a startup focused on extending human lifespan, to develop a new AI model called GPT-4b micro, as reported by MIT Technology Review. This model aims to re-engineer proteins known as Yamanaka factors, which have the potential to transform human skin cells into youthful stem cells, a step towards creating human organs and replacement cells. Unlike Google's AlphaFold, which predicts protein shapes, GPT-4b micro is OpenAI's first model tailored for biological research. Supported by Sam Altman, Retro has been working with OpenAI for about a year, and both organizations plan to publish their findings on this innovative model.