OpenAI announces GPT-5.5, its latest artificial intelligence model

OpenAI CEO Sam Altman during a media tour of the Stargate AI data center in Abilene, Texas, on September 23, 2025.
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OpenAI on Thursday announced its latest AI model, GPT-5.5, which the company says is better at coding, computing and pursuing deeper research capabilities.
The launch comes less than two months after OpenAI released GPT 5.4, the latest sign of the breakneck pace of development driving the AI industry.
“What makes this model really special is that it can do so much more with less guidance,” OpenAI President Greg Brockman said during a briefing with reporters on Thursday. “He can look at an obscure problem and figure out what needs to happen next. It seems to me that it’s laying the foundation for how we will use computers and how we will do computer work in the future.”
OpenAI is racing to catch up with rivals like Google and Anthropic, whose latest model, the Claude Mythos Preview, has wowed Wall Street.
OpenAI said GPT-5.5 excels at analyzing data, writing and debugging code, running software, researching online, and creating documents and spreadsheets. The company added that the model does not exceed the “Critical” cybersecurity risk threshold, which could introduce “unprecedented new pathways to serious harm,” but does meet the criteria for a “High” risk classification, which could “amplify existing pathways to serious harm.”
“GPT-5.5 has undergone extensive third-party security testing and red teaming for cyber and biosecurity [risks]“We have been iterating our cyber protections for months with increasingly cyber-capable models,” Mia Glaese, OpenAI’s vice president of research, said during Thursday’s briefing.
The cybersecurity risks presented by artificial intelligence have been on the minds of tech executives and government officials since Anthropic announced its Mythos model earlier this month. The company decided to limit the rollout of Mythos due to its ability to identify weaknesses and security flaws in the software.
GPT-5.5 will be available to OpenAI’s paid subscribers, including Plus, Pro, Business and Enterprise users, on ChatGPT and its coding assistant Codex on Thursday. The company said the model would come to the application programming interface “very soon,” but that these deployments require “different security measures.”
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