Weibo AI open-sources a $7,800 reasoning model
Weibo AI just open-sourced VibeThinker-1.5B, a 1.5B-parameter reasoning model trained for just $7,800. On benchmarks like AIME24 and AIME25, it outscored the original DeepSeek R1 despite having a fraction of the parameters. It is tailored specifically for competitive math and coding problems in English.