GLM 5.2 is nearly as accurate as a human book keeper

GLM 5.2, an open-weights AI model, achieved near-human accuracy in preparing UK VAT tax returns for small businesses, processing 59 transactions in 68 minutes at a cost of just $2.73—compared to typical accountant fees of $1,000–$2,800 per quarter. The model produced an essentially correct VAT return with only a 7-pence discrepancy from the ground truth, demonstrating the potential for AI to handle routine compliance tasks at a fraction of traditional costs.