OpenAI releases GPT-5.5 Instant, a new default model for ChatGPT

On Monday, OpenAI launched a brand new basis mannequin referred to as GPT-5.5 Immediate, which is able to substitute GPT-5.3 Immediate because the default ChatGPT mannequin. The corporate stated the mannequin reduces hallucination in delicate areas comparable to regulation, medication, and finance, whereas sustaining the low latency of its predecessor.

OpenAI launched the latest GPT-5.5 model last month with the corporate claiming enhancements in areas like coding and data work.

The brand new mannequin additionally achieved a rating of 81.2 within the AIME 2025 math take a look at, in comparison with 65.4 for the older mannequin. It additionally outperformed its predecessor on the MMMU-Professional multimodal reasoning benchmark, with a rating of 76.0 vs 69.2.

The discharge positioned a selected emphasis on context administration. GPT-5.5 Immediate can use its search device to refer again to previous conversations, information, and Gmail to present you extra personalised solutions. This characteristic can be obtainable to Plus and Professional customers on the internet, with plans to roll it out to cellular quickly. OpenAI stated that it plans to increase entry to this characteristic to Free, Go Enterprise, and enterprise customers within the coming weeks.

With this replace, ChatGPT will salso how reminiscence sources throughout all fashions that will help you perceive the place it generated the solutions from. Customers can delete outdated sources or appropriate them if the reply was fallacious. Crucially, the corporate stated that in the event you share a chat with somebody, they gained’t have the ability to see the reminiscence sources.

For builders, the GPT-5.5 mannequin can be obtainable via API as ‘chat-latest,’ with 5.3 obtainable as an possibility for paid customers for less than three months.

The corporate has faced rebuttal from earlier mannequin withdrawal strikes. When OpenAI withdrew its GPT-4o mannequin, there was important backlash from customers who related to the model’s “personality.” GPT-4o affirmed customers’ selections ceaselessly and that made them really feel a connection to that exact mannequin. Customers who signed petitions to cease OpenAI from retiring it described the mannequin as their “finest good friend” or “a mirror.” Regardless of the outcry, GPT-4o was deprecated in February 2026.