By W.H.L. with GPT-4o W.H.L.: Hi GPT! I’m told that OpenAI just released two open-source versions of GPT. Please tell me about them. GPT-4o: OpenAI has not open-sourced two new GPT models in the traditional sense of publishing training data—but as of August 5–6, 2025, they have released two open-weight models: gpt‑oss‑120b and gpt‑oss‑20b. These Continue reading