WSJ article (paywalled): https://www.wsj.com/tech/ai/anthropic-halts-access-to-top-ai-models-after-u-s-ban-on-foreign-use-a4bca2cc?mod=hp_lead_pos4 https://www.

WSJ article (paywalled): https://www.wsj.com/tech/ai/anthropic-halts-access-to-top-ai-models-after-u-s-ban-on-foreign-use-a4bca2cc?mod=hp_lead_pos4 https://www.wsj.com/tech/ai/anthropic-halts-access-to-top-ai... . The accessible portion mentions a letter from Howard Lutnick.