OpenAI returns old models to ChatGPT as Sam Altman admits ‘bumpy’ GPT-5 rollout

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OpenAI co-founder and CEO Sam Altman is publicly acknowledging major hiccups in yesterday’s rollout of GPT-5, the company’s new, flagship large language model (LLM) — advertised as its most powerful and capable yet.

Answering user questions in a Reddit AMA (Ask Me Anything) thread and in a post on X this afternoon, Altman admitted to a range of issues that have disrupted the launch of GPT-5, including faulty model switching, poor performance, and user confusion — prompting OpenAI to partially walk back some of its platform changes and reinstate user access to earlier models like GPT-4o.

“It was a little more bumpy than we hoped for,” Altman wrote in reply to a question on Reddit regarding the big GPT-5 launch.

As for erroneous model ...