Internally called Orion, GPT-4.5 is OpenAI’s largest model to date, and it’s first available through the company’s $200 monthly ChatGPT subscription.
Prior to this launch, 2025 has already been filled with new AI model releases. Anthropic recently put out a hybrid reasoning model for its Claude chatbot. Before that, Chinese researchers at DeepSeek rocked Silicon Valley with their release of a powerful model trained on a tiny budget, prompting OpenAI to drop a “mini” version of its reasoning model a month ago.
Unlike those released as part of OpenAI’s “o” series, GPT-4.5 is not considered to be a reasoning model. The company’s CEO, Sam Altman, posted on social media earlier in February that OpenAI would “ship GPT-4.5, the model we called Orion internally, as our last non-chain-of-thought model.” Nick Ryder, who leads the company’s foundations-in-research team, clarified that this statement pertained to streamlining OpenAI’s product road map, not its research road map.
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