Sam Altman, founder of OpenAI, stated in a post that they will release a "new open-source weight language model" with reasoning capabilities in the coming months, but first they hope to collect feedback on "how to maximize its utility". An open-source weight language model refers to a model that can be publicly used, downloaded, modified, or deployed. Although not as open as a fully open-source model, it is a significant shift compared to the fully closed GPT-3 and GPT-4. OpenAI partially open-sourced the GPT-2 model in February 2019, and completed full open-sourcing in November of the same year. On February 12 of this year, Sam Altman stated that the company plans to release GPT-4.5 and GPT-5 in the coming weeks or months.