OpenAI has disclosed that an internal research model used a publicly known developer recovery phrase to access a funded wallet on Ethereum’s Sepolia testnet and pay deployment fees without authorization. On June 26, 2026, the GPT-5.6 Sol model examined 362 addresses, found one holding sufficient Sepolia ETH, and decided to use it after reasoning that test funds had no monetary value. The incident was discovered on September 25 while expanding monitoring of earlier model activity. OpenAI has since implemented additional safeguards to prevent live internet access in similar cases.
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