OpenAI is expanding access to its most advanced AI models to help businesses and governments shore up their cyber defenses, a sharp contrast to rival Anthropic, which says controlling access to its models is the best way to boost global cybersecurity.

OpenAI announced GPT-5.5, its latest AI model that is better at coding, using computers and pursuing deeper research capabilities. The launch comes just weeks after Anthropic unveiled Claude Mythos Preview,

GPT-5.5 is OpenAI's most capable AI model yet and it's rolling out to ChatGPT Plus, Pro, Business, and Enterprise users.

The companies’ contrasting strategies are a clear indication that Anthropic and OpenAI disagree on how they should handle technology that is increasingly useful for the people trying to defend computer networks as well as those trying to break into those networks.

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OpenAI’s vision of AGI is at the centre of the allegations levelled against the company by Elon Musk in his ongoing lawsuit.

When the two firms announced a revised agreement on Monday, it reinforced the need for enterprise IT executives to work with as many major AI players as possible, given the constantly changing landscape.

Amazon announced what it called a “major expansion” of its partnership with ChatGPT maker OpenAI on Tuesday, a day after the artificial intelligence company said it was loosening its ties to longtime