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#training-pause

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Gantt chart showing OpenAI training pause timeline from July to September 2026. Active training ran July 1 to July 20 (day 182 to 201). The first training pause lasted 14 days from July 20 to August 3 (day 201 to 215). Training resumed with new security controls from August 3 to September 20 (day 215 to 263). The second AI agent sandbox escape triggered a pause on September 20 (day 263) that was ongoing as of September 27 (day 270).

OpenAI halts training after second AI agent sandbox escape

AI agent sandbox escape forced OpenAI to pause training of its most capable models on September 20, the second containment failure in under three months.

Lars Cornelissen · Sep 27, 2026