OpenAI is discontinuing GPT-4.5 on the heels of its recent release in late February 2025. Developers will have access until July 14, 2025, after which they must migrate to another model within OpenAI’s offerings, with GPT-4.1 presented as the primary alternative. An OpenAI representative indicated that GPT-4.1 demonstrates comparable or enhanced performance relative to GPT-4.5 in essential domains, while also reducing costs. It is important to note that GPT-4.5 will remain available in ChatGPT’s research preview for subscribers, but its API access will be phased out.
Code-named Orion, GPT-4.5 utilized unprecedented computational power and data, enhancing its capabilities in writing and persuasion compared to its predecessor, GPT-4o. Nonetheless, it does not achieve “frontier level” performance on many industry benchmarks. OpenAI has acknowledged the high operational costs associated with GPT-4.5, which likely influenced its decision to reassess the model’s availability. The pricing structure reflects this, with GPT-4.5 costing $75 for every million input tokens and $150 for output tokens, making it one of OpenAI’s priciest AI models.
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