OpenAI announced the impending discontinuation of its largest AI model, GPT-4.5, from its API, effective July 14. Released in February, GPT-4.5 will be replaced by GPT-4.1, which promises similar or improved performance at a lower cost. While GPT-4.5 will remain available in ChatGPT for paying users, its high operational costs have prompted the shift. OpenAI emphasized its focus on future model development, stating that GPT-4.5's pricing structure made it unsustainable for long-term API use. Developers are urged to transition to the new model ahead of the deadline.