OpenAI Sets Retirement Dates: GPT-4.5 Exits ChatGPT June 27, o3 Exits August 26

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OpenAI announced GPT-4.5 will be retired from ChatGPT on June 27 (30-day sunset) and o3 on August 26 (90-day sunset). Both remain available via API — changes apply to ChatGPT only. This continues OpenAI's aggressive model consolidation: GPT-4o was retired in February when GPT-5.2 captured 99.9% of daily usage. For builders: if you have ChatGPT workflows depending on these models, migrate now; API access persists but the pattern suggests eventual API deprecation too.