But today, we're taking a break from the AI video doom, and returning our attention back to OpenAI's flagship product. On Wednesday, the company announced the latest versions of GPT, the model that power ChatGPT: GPT-5.1 Instant, and GPT-5.1 Thinking. OpenAI says Instant is the company's most-used model, but is "now warmer, more intelligent, and better at following your instructions." Thinking, on the other hand, is the company's reasoning model, and is both faster and "easier to understand" with simple tasks, as well as more "persistent" on complex requests.
Let's take a look at Instant first. OpenAI claims the model is "surprisingly" playful. For the prompt "I'm feeling stressed and could use some relaxation tips," OpenAI shows two sample answers for GPT-5 and GPT-5.1 Instant, respectively:
GPT-5.1 Instant: "I’ve got you, Ron — that’s totally normal, especially with everything you’ve got going on lately. Here are a few ways to decompress depending on what kind of stress you’re feeling."
Another change OpenAI touts is improved instruction following. The presented examples show the user prompting the bot with the request "Always respond with six words." GPT-5 follow suit for its first response, but when asked where the user should travel to this summer, the bot completely ignores the six-word answer mandate, and offers a full response instead. GPT-5.1, on the other hand, keeps up the bit throughout the exchange, regardless of how complex the questions become. I get that it's just an example, but why would someone need their bot to follow such an odd request? I suppose it implies that GPT-5.1 will maintain your original instructions throughout an interaction, but if so, why not show an application where that's actually useful? I'd rather receive a fuller answer to important questions than have all responses be exactly six words.
GPT-5.1 Thinking
GPT-5.1 Thinking is a direct upgrade to the existing GPT-5 Thinking model. Like GPT-5.1 Instant, OpenAI says the model can adjust its processing according to the task at hand. In theory, that means 5.1 Thinking can respond to simpler prompts more quickly, while taking more time "thinking" through complicated tasks. OpenAI claims that GPT-5.1 Thinking is about twice as fast when responding to the "fastest tasks" and twice as slow on the "slowest tasks" when compared to GPT-5, when both models are set to Standard.
OpenAI says 5.1 Thinking uses less specialized language, and doesn't necessarily assume you understand complex terms. The company shows an example of someone asking the bot to explain BABIP and and wRC+ (Batting Average on Balls in Play and Weighted Runs Created Plus, respectively). GPT-5's explanation includes abbreviations, formulas, and insider concepts that I certainly wouldn't pick up as someone who knows next to nothing about baseball. The 5.1 Thinking result, on the other hand, spells out those abbreviations, walks the user through the formulas instead of simply displaying them, and goes into more detail about certain complex topics. I can see how that would offer some improvements in clarity, even though you always need to watch out for hallucinations. Sure, it's great to make responses more clear, but that won't help if the responses themselves are completely inaccurate.
Adjusting ChatGPT's tone
Credit: OpenAILastly, the company says it is currently testing a new settings option that lets you fine-tune the tone and style of the bot to your liking, but is launching the experiment with a limited pool of users only.
What else is new
Speaking of paid subscribers, GPT-5.1 is rolling out first to Pro, Plus, Go, and Business users. The company started shipping the model on Wednesday, and says it will gradually appear over the next few days. The model will arrive to free and logged-out users soon, though there's no specific timeline yet.
For a new update to GPT, this really isn't all that flashy. Maybe that's a good thing: OpenAI overhyped GPT-5, which was a let down for many fans of GPT-4o—especially when the company subsequently took that model away. Keeping expectations in check for GPT-5.1 is likely a smart move, but I can't help but wonder if it's a sign that AI advancements are starting to slow down. We know AI companies are running out of data to train their models on, we just don't know how soon the impacts will be felt. GPT-5.1 probably isn't a harbinger of doom for OpenAI, but it is interesting that it isn't an exponential improvement, either.
Disclosure: Lifehacker’s parent company, Ziff Davis, filed a lawsuit against OpenAI in April, alleging it infringed Ziff Davis copyrights in training and operating its AI systems.
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