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

Another day in late 2025, another impressive result from a Chinese company in open source artificial intelligence.Chinese social networking company Weibo’s AI division recently released its open source VibeThinker-1.5B—a 1.5 billion parameter large language model (LLM) that is a fine-tuned variant of rival Chinese tech firm Alibaba’s Qwen2.5-Math-1.5B…
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