GPT-4.5 fully retired from ChatGPT after its 30-day sunset; existing chats fall back to GPT-5.5 (no API change) · Jadid

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Sunday, June 28, 2026 · 2 of 4

GPT-4.5 fully retired from ChatGPT after its 30-day sunset; existing chats fall back to GPT-5.5 (no API change)
Jun 27Pricing

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