OPENAI GIVES EU REGULATORS ACCESS TO NEW CYBER AI — ANTHROPIC IS STILL HOLDING OUT OpenAI has agreed to give European Union regulators limited preview access to GPT-5.5-Cyber, a specialized variant of its latest model built for cybersecurity applications. The rollout goes to vetted EU security teams, a move widely read as an olive branch to regulators who have been pushing hard for transparency from American AI companies operating in Europe. Anthropic is not following suit. The company’s most powerful model, Mythos, launched about a month ago but has not been made available to EU reviewers. Discussions are reportedly ongoing, but at a much earlier stage than those with OpenAI. The gap matters. Europe’s AI Act is entering enforcement phases in stages, and regulators have been vocal about wanting early access to frontier models to assess safety before full public deployment. OpenAI cooperating puts pressure on every other major lab to do the same. Holding out risks a rocky relationship with one of the most powerful regulatory bodies in the world at the precise moment AI companies are trying to expand European enterprise operations. The broader trend is unmistakable. Voluntary cooperation with regulators is becoming a competitive differentiator — a way to signal trustworthiness to enterprise customers and governments that are currently writing the rules these companies will live under for years. Keywords: OpenAI EU regulators, Anthropic Mythos EU access, AI regulation 2026, EU AI Act enforcement