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

With safer design, more robust reasoning, expanded developer tooling, and broad user access, GPT-5 reflects a maturing AI ecosystem.

Developers can now build, test, and deploy applications powered by OpenAI’s gpt-oss models within the AI development platform ...