OpenAI has begun rolling out GPT-5, the latest iteration of its flagship language model, to all ChatGPT users.

The GPT-5 launch comes as OpenAI faces increasing competition from Google's Gemini models, Anthropic's Claude family, and Meta's open-weight Llama models. OpenAI reports having 5 million paying business users and 4 million developers building on its API platform.

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.