Britain’s AI Security Institute has regained access to pre-release versions of the latest artificial intelligence models from leading American developers, following a 17-day interruption. The freeze was requested by the Office of the National Cyber Director, which wanted US safety reviews to be prioritized. Anthropic chose to withhold its Claude Mythos 5.1 model from non-US entities throughout the period. Access was restored on October 11, 2026. The models now under review include Google’s Gemini 4 Argon, and UK AI Minister Kanishka Narayan is credited with helping secure the renewed access.
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