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OpenAI Limits Access to New GPT‑5.6 at U.S. Request as IPO Plans Face Pressure

Officials say the phased preview is meant to curb misuse of powerful features that can find software vulnerabilities.

Overview

  • Late June OpenAI unveiled the GPT‑5.6 family and, at the request of U.S. authorities, restricted initial preview access to a small set of trusted U.S. partners.
  • The GPT‑5.6 line includes three variants called Sol, Terra and Luna, and OpenAI says Sol can autonomously perform tasks in programming, biology and cybersecurity.
  • Before OpenAI’s move the U.S. had ordered Anthropic to limit distribution of its Mythos/Fable models and then approved a partial re-release of Mythos 5 to vetted firms after the company cooperated with regulators.
  • A June audit published by journalist Ed Zitron showing a jump in losses has heightened investor concern and several reports say OpenAI is weighing a delay of a planned late‑2026 IPO into 2027.
  • Analysts warn that high compute costs and revenue concentrated with a few partners raise sustainability questions, and tighter government controls could steer customers toward open‑source or regional alternatives and reshape global access to frontier models.