Coinbase fine-tunes Qwen3.5-9B model for fraud prevention, beating frontier models

Coinbase fine-tuned the Qwen3.5-9B model for fraud prevention, outperforming frontier models. The tailored AI solution proved more cost-effective than general models, highlighting the potential of specialized approaches in fraud detection. The success underscores the value of custom models over one-size-fits-all alternatives in the crypto exchange's security operations.