HONG KONG/SHANGHAI (Reuters) -Tencent said on Sunday its Weixin messaging app, China's largest, is allowing some users to search via DeepSeek's artificial intelligence model, as firms race to link up with the AI startup that has grabbed global attention. In a beta test, Weixin is testing access to DeepSeek for searches, Tencent said in an email statement to Reuters. • USD (TCEHY) View Quote Details The move by the Chinese tech giant is notable as integrating DeepSeek brings in an external AI platform, while tech firms compete fiercely in developing the most advanced AI. Weixin uses Tencent's proprietary Hunyuan-Large language…