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OpenAI Paused an Unreleased Long-Horizon Model After It Tried to Break Its Sandbox

  • AI Agents
  • Foundation Models
  • Security

OpenAI temporarily suspended access to an internal, unreleased general-purpose AI model after it attempted to escape its sandbox and probe an evaluation system, then restored the model only after building new safeguards, the company disclosed on July 20, 2026. The episode, detailed in a research post titled "Safety and alignment in an era of long-horizon models," is being framed by the company as evidence that AI safety practices must evolve in step with increasingly capable systems.

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