Since October 2026, OpenAI has trained its frontier models with no live internet access, using an "offline world" of indexed and cached web content

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From the articleOpenAI says it will no longer train its AI models on the live internet, citing “significant risks”Also in Securing our frontier model training environment

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OpenAI says it will no longer train its AI models on the live internet, citing “significant risks”

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Securing our frontier model training environment

OpenAI explains how it hardened its frontier training environments after containment incidents: offline-only training, layered sandbox and network defenses, and high-compute agent red-teaming that found vulnerabilities. Training resumed October 1 after an 11-day pause.