Editorial illustration for OpenAI Launches Two New GPT-5.1 Models, Phases Out Legacy GPT-5 in Months
OpenAI Unveils GPT-5.1 Models, Retires Legacy GPT-5 Lineup
OpenAI rolls out two GPT-5.1 models this week; legacy GPT-5 stays three months
OpenAI is pushing out two new models this week, branding them GPT-5.1. The timing is what grabs you: just three months after the last major release. That's a breakneck pace, even for them.
The two new models will start rolling out to ChatGPT users this week, and the old GPT-5 models will be available for three months in ChatGPT's legacy models dropdown menu before they disappear. As part of the update, OpenAI also said it would expand its personality presets for the conversational tone of the models. The total list of options now includes Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical, per the company's blog post.
OpenAI also said in a release that it would also debut an "experiment for new ways to fine-tune ChatGPT's style directly from settings," which some users will begin to be able to access this week. "With more than 800 million people using ChatGPT, we're well past the point of one-size-fits-all," Fidji Simo, the company's CEO of Applications, wrote in a Wednesday Substack post. While OpenAI CEO Sam Altman hyped up the announce of GPT-5 in August, the release failed the hype test.
Many ChatGPT users were left unimpressed, particularly at the incremental improvements, and expressed frustration over OpenAI's choice to make it the default model for ChatGPT. There was so much pressure that OpenAI decided it would bring back GPT-4o as an option, a day after the launch of GPT-5. Microsoft, OpenAI's strategic AI partner, has also increasingly been looking at rival models from Anthropic after GPT-5 failed to raise the bar enough.
Anthropic's models are now helping power Copilot Researcher, GitHub Copilot, Copilot Studio, and a new Office Agent that is able to produce Word and PowerPoint documents from Microsoft's own Copilot chat interface. The announcement of GPT-5.1 comes just weeks after OpenAI launched its AI-powered web browser, ChatGPT Atlas.
That three-month grace period for the old GPT-5? It’s a direct concession. A quiet admission that August's launch, which saw GPT-5 become the default for a single chaotic day before users revolted, was a misstep.
It gives developers an off-ramp. More importantly, it avoids forcing another unpopular model on everyone overnight.
Look past the version number, though. The real shift is in that list of eight personality presets—from "Professional" to "Cynical." This is the experiment now. Not raw capability, but character.
When applications CEO Fidji Simo states they're "well past the point of one-size-fits-all," she's signaling a fundamental pivot. The core intelligence is becoming a commodity. The race is for the right voice.
Whether GPT-5.1 represents a meaningful technical improvement is an open question; the ".1" suggests a patch, not a breakthrough. This feels less like innovation and more like urgent maintenance, a company scrambling to recalibrate its relationship with users and partners like Microsoft before they look elsewhere for good.
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Common Questions Answered
How many personality presets will be available with the new GPT-5.1 models?
OpenAI is expanding the personality presets to a total of eight options, which include Default, Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical. These new personality options will provide users with more nuanced conversational control when interacting with the ChatGPT models.
What is the transition timeline for the new GPT-5.1 models?
The two new GPT-5.1 models will start rolling out to ChatGPT users this week, with the legacy GPT-5 models remaining available in the dropdown menu for three months. This three-month window allows developers and users to smoothly adapt to the updated versions of the AI models.
What strategic approach is OpenAI taking with these model updates?
OpenAI is demonstrating its commitment to rapid technological iteration by introducing two new GPT-5.1 models that represent more than just a routine upgrade. The company is strategically refreshing its language model lineup to continuously refine and improve its conversational AI platform.
Further Reading
- OpenAI Research | Release — OpenAI
- Introducing GPT-5 - OpenAI — OpenAI
- OpenAI's GPT-5.1 Model Just Leaked (Polaris Alpha Explained) — Universe of AI (YouTube)
