VibeThinker-1.5B by Sina Weibo

1.5B language model with strong reasoning at tiny cost

3 followers

VibeThinker-1.5B is a 1.5B-parameter dense language model trained for only $7,800. It delivers reasoning performance comparable to much larger models (e.g., GPT OSS-20B Medium) while staying small, efficient, and easy to run—ideal for research, startups, and edge deployment.
VibeThinker-1.5B by Sina Weibo gallery image
VibeThinker-1.5B by Sina Weibo gallery image
VibeThinker-1.5B by Sina Weibo gallery image
VibeThinker-1.5B by Sina Weibo gallery image
Free
Launch Team
AssemblyAI
AssemblyAI
Build voice AI apps with a single API
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What do you think? …

Polman Trudo

What shocked me is that it’s a dense 1.5B-parameter model trained for just $7.8K that delivers reasoning performance comparable to much larger models (e.g., GPT OSS‑20B Medium). That’s huge for teams who need strong reasoning but can’t afford massive training or inference costs.