ChatGPT GPT-4.5 retired from product surface today June 26 — no longer available in ChatGPT including for custom GPTs, product-rationalization continues OpenAI deprecation pattern at scale
OpenAI retired GPT-4.5 from ChatGPT today — the model is no longer available in ChatGPT including for custom GPTs. The deprecation continues OpenAI's product-rationalization pattern at scale — narrowing the available model surface as GPT-5.5 Instant democratizes through universal rollout. Custom GPT operators face migration pressure.
The substantive piece is the deprecation-pattern continuation at GPT-4.5 specifically. Pre-GPT-4.5 retirement OpenAI's model surface included multiple capability tiers (GPT-4o, GPT-4.5, GPT-5, GPT-5.5). GPT-5.5 Instant universal rollout + GPT-4.5 retirement combination narrows the model surface — GPT-5.5 Instant becomes the standard, older tiers retired.
The competitive read for the H2 2026 frontier-model deprecation pattern is that OpenAI is operationally rationalizing the product surface aggressively. Custom GPT operators built on GPT-4.5 face mandatory migration to GPT-5.5 or alternative platforms. The pattern compounds with Sora web/app + API discontinuation + earlier model retirements — OpenAI continues narrowing product surface at substantial pace.
OpenAI — ChatGPT — Release Notes → · MarketingProfs — AI Update, June 26, 2026 →