OpenAI Has a New GPT-5.4-Cyber Model. Here's Why You Can't Use It
… Unlike Claude Mythos Preview, which Anthropic said is an entirely new model, OpenAI's GPT-5.4-Cyber is a fine-tuned version of its existing GPT-5.4 large language model. …
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Claude Mythos
AI Arms Race Accelerates With New Models from OpenAI, DeepSeek and Anthropic
… Anthropic's less risky AI model Lastly, Anthropic's Opus 4.7 is, let's say, a more accessible and friendly version of AI than Mythos . Mythos is a highly advanced AI model that the company says is so potentially dangerous to cybersecurity that it has been kept from public release so far. …
ChatGPT 5.5 Is All About Math, Science and AI Research
… That's why both Anthropic's Claude Mythos Preview and OpenAI's 5.4-Cyber were released to developers to root out problems before a potential public release. …