About the brand ❤️
GPT‑4.5 (codenamed “Orion”) is a large language model by OpenAI, released February 27, 2025. It was trained using a mix of unsupervised learning, supervised fine‑tuning, and reinforcement learning from human feedback. The model delivers broader general knowledge, enhanced creativity, and more natural conversational style, while being less prone to hallucinations. It accepts image and text inputs and is available via ChatGPT (Plus / Pro) and API (during its preview period). GPT‑4.5 was later deprecated in favor of GPT‑5 starting August 2025.
Founded: 2015
Closed: 2025
Headquarters:
San Francisco, California, United States of America (the)
Owner: OpenAI
https://openai.com/chatgpt
