G itHub 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.”

OpenAI’s new open-weight models are gpt-oss-120b and gpt-oss-20b. The smaller model, gpt-oss-20b, can be run on a consumer laptop or powerful phone.

OpenAI is set to unveil GPT-5, its most advanced AI model yet, in a livestream event today. Here's what to expect in terms of features, capabilities, and availability for ChatGPT users.