OpenAI and Anthropic are restricting access to their most advanced AI models as a strategic move to gain greater control over security, model distillation, and competing applications. This development comes amid pressure from U.S. regulatory bodies, with Anthropic previously disabling model access due to export-control concerns. OpenAI’s latest GPT-5.6 models and Anthropic’s Claude Fable 5 and Mythos 5 have been subject to access limitations. Market participants view these restrictions as potentially negative for OpenAI’s short-term valuation prospects.
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