Weibo's new open source AI model VibeThinker-1.5B outperforms DeepSeek-R1 on $7,800 post-training budget

Chinese social networking company Weibo's AI division recently released its open source VibeThinker-1.5Ba 1.5 billion parameter large language model (LLM) It's a fine-tuned variant of rival Chinese tech firm Alibaba's Qwen2.5-Math