OpenAI's GPT-5.5 surpasses Anthropic's Mythos in key AI evaluation

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OpenAI’s GPT-5.5 has reportedly surpassed Anthropic’s Mythos model in a critical AI evaluation, according to sources. This development comes at a time when Anthropic’s models, including Fable 5 and Mythos 5, have been suspended under U.S. export-control directives due to national security concerns. Despite the ban on Anthropic’s models, OpenAI’s GPT-5.5 continues to operate without restrictions. The impact of these events on the competitive landscape of AI development is significant, with OpenAI’s model showing a slight edge in specific expert-level cyber tasks, although still trailing Mythos in the broader headline simulation.

Key Takeaways

OpenAI’s GPT-5.5 appears to have outperformed Anthropic’s Mythos model in a key AI evaluation, suggesting an edge in certain cyber tasks.

Anthropic’s suspension of Fable 5 and Mythos 5 models due to national security concerns adds complexity to the competitive AI landscape.