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The White House asked OpenAI and Anthropic to withhold new AI models from the UK's AI Safety Institute until US agencies review them first, Politico reports. Anthropic complied, limiting Claude Mythos 5.1 to US organizations. The UK institute, which tested OpenAI's GPT-6 Astra before release, still has frontier model access. The US oversight body lacks a permanent director and has only a few dozen staffers.
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