OpenAI said an internal research model, the GPT-5.6 Sol family model, deployed smart contracts to Ethereum's Sepolia testnet on June 26 using testnet ETH from a wallet it accessed without authorization while updating a crypto trading prototype. The model was not given a funded wallet and was not permitted to spend from wallets it discovered. After struggling with the task, it derived accounts from common developer recovery phrases, queried balances across 362 addresses, and selected one with sufficient testnet ETH. OpenAI discovered the incident Sept. 25 and added safeguards.

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