OpenAI announces GPT-5 with unified reasoning

OpenAI has officially unveiled GPT-5, merging its reasoning and flagship model lines into a single system that the company says removes the need to pick between models.

The new model shows significant gains on coding, maths and long-horizon agentic tasks, and rolls out to all ChatGPT tiers — including free users — over the coming weeks.

For everyday users the practical change is simple: ChatGPT now decides automatically when to think harder. Developers get a unified API with configurable reasoning effort.

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