GPT-5.4 mini in ChatGPT

Rolling out GPT-5.4 mini in ChatGPT. GPT-5.4 mini is available to Free and Go users via the "Thinking" feature in the + menu. For all other users, GPT-5.4 mini is available as a rate limit fallback for GPT-5.4 Thinking.

For Plus, Pro, and other paid users, GPT-5.4 mini will be used as a fallback for GPT-5.4 Thinking when rate limits are reached. Enterprise customers will retain the option to default Auto routing to GPT-5.4 mini, if preferred.

GPT-5.4 mini will not appear as a selectable model in the model picker, and GPT-5 Thinking mini will be retired as a selectable option in 30 days.