OpenAI returns outdated fashions to ChatGPT amid ‘bumpy’ GPT-5 rollout

OpenAI co-founder and CEO Sam Altman is publicly acknowledging main hiccups in yesterday’s rollout of GPT-5, the corporate’s new, flagship massive language mannequin (LLM) — marketed as its strongest and succesful but.

Answering person questions in a Reddit AMA (Ask Me Something) thread and in a put up on X this afternoon, Altman admitted to a variety of points which have disrupted the launch of GPT-5, together with defective mannequin switching, poor efficiency, and person confusion — prompting OpenAI to partially stroll again a few of its platform adjustments and reinstate person entry to earlier fashions like GPT-4o.

“It was somewhat extra bumpy than we hoped for,” Altman wrote in reply to a query on Reddit relating to the large GPT-5 launch.

As for misguided mannequin efficiency charts proven off throughout OpenAI’s GPT-5 livestream, Altman stated: “Folks had been working late and had been very drained, and human error obtained in the best way. Rather a lot comes collectively for a livestream within the final hours.”

Whereas he famous the accompanying weblog put up and system card had been correct, the missteps additional muddied a launch already dealing with scrutiny from early customers and builders.

GPT-5 rollout updates:

*We’re going to double GPT-5 charge limits for ChatGPT Plus customers as we end rollout.

*We’ll let Plus customers select to proceed to make use of 4o. We’ll watch utilization as we take into consideration how lengthy to supply legacy fashions for.

*GPT-5 will appear smarter beginning…

— Sam Altman (@sama) August 8, 2025

Issues with new computerized mannequin router

One key motive for the difficulty based on Altman stems from OpenAI’s new computerized “router” that assigns person prompts to one among 4 GPT-5 variants — common, mini, nano, and professional — with an non-compulsory “pondering” mode for heavier reasoning duties.

On X, Altman revealed {that a} key a part of that system — the autoswitcher — was “out of fee for a bit of the day,” inflicting GPT-5 to seem “method dumber” than meant.

In response, OpenAI says it’s implementing adjustments to the mannequin resolution boundary and can make it extra clear which mannequin is responding to a given question.

A UI replace can be on the best way to assist customers manually set off pondering mode.

Moreover, Altman confirmed that OpenAI will now permit ChatGPT Plus customers to proceed utilizing GPT-4o — the prior default mannequin — after a wave of complaints about GPT-5’s inconsistent efficiency. He stated on Reddit the corporate is “making an attempt to collect extra knowledge on the tradeoffs” earlier than deciding how lengthy to supply legacy fashions.

But many customers together with OpenAI beta testers like Wharton College of Enterprise professor Ethan Mollick expressed confused and dismay at OpenAI unilaterally upgrading their ChatGPT experiences to GPT-5 and initially taking away entry to the older fashions.

Actual-world efficiency lags behind hype

OpenAI’s inside benchmarks could present GPT-5 main the pack of LLMs, however real-world customers are sharing a unique expertise.

Because the launch, customers have posted quite a few examples of GPT-5 making primary errors in math, logic, and coding duties.

Information scientist Colin Fraser posted screenshots of GPT-5 incorrectly fixing whether or not 8.888 repeating equals 9 (it doesn’t, clearly), whereas one other person confirmed it flubbing a easy algebra downside: 5.9 = x + 5.11.

And nonetheless different customers reported hassle getting correct solutions to math phrase issues or utilizing GPT-5 to debug its personal presentation charts.

Developer suggestions hasn’t been a lot better, with customers posting pictures of GPT faring worse at “one-shot” sure programming duties — finishing them effectively with a single-prompt — in comparison with rival AI lab Anthropic’s new mannequin Claude Opus 4.1.

And safety agency SPLX discovered GPT-5 nonetheless suffers from critical vulnerabilities to immediate injection and obfuscated logic assaults except its security layer is hardened.

OpenAI within the highlight

With 700 million weekly customers on ChatGPT, OpenAI stays the most important participant in generative AI by viewers.

However that scale has introduced rising pains. Altman famous in his X put up that API site visitors doubled over 24 hours following the GPT-5 launch, contributing to platform instability.

In response, OpenAI says it should double charge limits for ChatGPT Plus customers, and proceed to tweak infrastructure because it gathers suggestions.

However the early missteps — compounded by complicated UX adjustments and errors in a high-profile launch — have opened a window for rivals to achieve floor.

The stress is on for OpenAI to show that GPT-5 isn’t simply an incremental replace, however a real step ahead. Based mostly on the preliminary rollout, many customers aren’t satisfied — but.