On Monday, OpenAI launched a brand new basis style known as GPT-5.5 Fast, which is able to substitute GPT-5.3 Fast because the default ChatGPT style. The corporate mentioned the style reduces hallucination in delicate spaces equivalent to legislation, drugs, and finance, whilst keeping up the low latency of its predecessor.
OpenAI launched the newest GPT-5.5 style remaining month with the corporate claiming enhancements in spaces like coding and information paintings.
The brand new style additionally accomplished a ranking of 81.2 within the AIME 2025 math check, in comparison to 65.4 for the older style. It additionally outperformed its predecessor at the MMMU-Professional multimodal reasoning benchmark, with a ranking of 76.0 vs 69.2.
The discharge positioned a specific emphasis on context control. GPT-5.5 Fast can use its seek instrument to refer again to previous conversations, recordsdata, and Gmail to come up with extra personalised solutions. This option can be to be had to Plus and Professional customers on the net, with plans to roll it out to cell quickly. OpenAI mentioned that it plans to increase get entry to to this selection to Loose, Move Trade, and endeavor customers within the coming weeks.
With this replace, ChatGPT will salso how reminiscence assets throughout all fashions that can assist you perceive the place it generated the solutions from. Customers can delete old-fashioned assets or right kind them if the solution was once flawed. Crucially, the corporate mentioned that when you proportion a talk with somebody, they gained’t be capable to see the reminiscence assets.
For builders, the GPT-5.5 style can be to be had thru API as ‘chat-latest,’ with 5.3 to be had as an choice for paid customers for handiest 3 months.
The corporate has confronted rebuttal from earlier style withdrawal strikes. When OpenAI withdrew its GPT-4o style, there was once important backlash from customers who associated with the style’s “character.” GPT-4o affirmed customers’ possible choices continuously and that made them really feel a connection to that individual style. Customers who signed petitions to forestall OpenAI from retiring it described the style as their “perfect pal” or “a reflect.” In spite of the outcry, GPT-4o was once deprecated in February 2026.
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