GPT-4.5

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What Wikipedia says

GPT-4.5 (codenamed "Orion") is a large language model developed by OpenAI as part of the GPT series. Officially released on February 27, 2025, GPT-4.5 is available to users subscribed to the ChatGPT Plus and Pro plans across web, mobile, and desktop platforms.

Excerpt from the Wikipedia article “GPT-4.5”, under the CC BY-SA 4.0 license. Read the article on Wikipedia