DeepSeek has issued automatic refunds to API users affected by a data error in its cache billing system. The error, which occurred between May 13th and June 9th, 2026, impacted billing for some users. As a result, DeepSeek credited affected accounts with bonuses equivalent to the erroneous charges. The company has ensured that future API billing will prioritize deductions from these bonus balances. Users can verify refund details by logging into the DeepSeek platform. DeepSeek has apologized for the inconvenience caused by this issue.