OpenAI is pulling older ChatGPT models following GPT-5 launch - so bad news if you use GPT-4 or others at work

• OpenAI says GPT-5 is rolling out to all users, replacing previous models with immediate effect
• ChatGPT now includes automatic model routing via GPT-5 models
• Enterprise APIs still include access to older models - but not for long

Following OpenAI's launch of GPT-5, its most advanced model to date, the AI giant has removed a number of previous-generation models from its repertoire with immediate effect.

The launch of GPT-5 has seen OpenAI officially retire its previous-generation models (GPT-4o, o3, o4-mini and o4-mini-high) for many users, instead moving to make GPT-5 the standard option across all tiers including free accounts.

However, it now means users will no longer be able to pick from previous-generation models for their AI tools, which they may have preferred for specific workloads.