OpenAI retires last GPT‑4 model, closing a landmark chapter in AI

OpenAI announced the retirement of GPT‑4.5, the final GPT‑4‑based model still available in ChatGPT, marking the end of an era that propelled generative AI into mainstream use. The company posted a brief note in ChatGPT’s release notes, confirming that GPT‑4.5 will be removed on June 27, 2026 after a 30‑day sunset period, while the older o3 model will disappear on August 26, 2026. Users, especially paid subscribers, expressed disappointment on X, recalling the models’ writing and reasoning strengths. The move signals OpenAI’s shift toward newer, more capable models such as GPT‑5.5. Lire la suite