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OpenAI to Discontinue Its Largest Model GPT-4.5 from API Due to Cost Concerns

OpenAI announced it will phase out GPT-4.5, its largest-ever AI model, from its API by July 14, just months after its February release. The company is positioning the newly launched GPT-4.1 as the preferred replacement, citing similar or improved performance at a much lower cost. GPT-4.5 will remain available in ChatGPT for paying customers, but its high computational expenses have made it unsustainable for broader API access.