Unified AI Model: No more switching between “reasoning” and “creative” modes—GPT 5 blends them into one smarter assistant. Better Reasoning: Handles logic-heavy and multi-step problems more reliably, ...

OpenAI's new ChatGPT model GPT-5 has the intelligence of a "legitimate Ph.D level expert in any area," CEO Sam Altman said.

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

Introduced in March 2023, GPT-4 was a landmark model that helped push ChatGPT to new heights. It powered smarter chat interactions, more complex reasoning, and even creative writing.

OpenAI CEO Sam Altman has said that GPT-4, reportedly massive in size, cost more than $100 million to train. It was succeeded by GPT-4 Turbo in November 2023, a faster and cheaper model.

GPT-4, released in March 2023, was a notable step up from GPT-3.5, the previous model, which ushered in the ChatGPT explosive introduction to the world.

In fact, while GPT-4.5 is the newest model release, OpenAI says that its o3 reasoning model remains its most powerful. It describes GPT-4.5 as a research preview and not a frontier model.

OpenAI has just released GPT-4.5, a new version of its flagship large language model. The company claims it is its biggest and best model for all-round chat yet. “It’s really a step forward ...