GitHub has accidentally announced OpenAI’s new range of GPT-5 models. A now-deleted GitHub blog post reveals that GPT-5, which will be available in four different versions, offers “major improvements in reasoning, code quality, and user experience.”Reddit posters noticed a new GitHub blog post announcing that GPT-5 is generally available in GitHub models, before the blog post was quickly removed. Earlier this week multiple OpenAI employees started teasing that it would be a big week, and OpenAI CEO Sam Altman even teased GPT-5 over the weekend. OpenAI has all but confirmed it’s launching GPT-5 later today, with the announcement of a “LIVE5TREAM” for 10AM PT / 1PM ET. OpenAI’s GPT-5 launch comes in the same week the company also delivered two GPT-OSS open-weight models, with one small enough to run locally on a PC.