# VibeThinker-3B (3B)

> Qwen2.5-Coder-based dense reasoner whose gains mainly come from verifier-driven post-training rather than a new block design.

| Property | Value |
| --- | --- |
| Lab | Weibo (China) |
| Released | 2026-06-15 |
| Decoder type | Dense |
| Family | Dense |
| Scale | 3B parameters |
| Context window | 131,072 tokens |
| Attention | 8:1 GQA with RoPE |
| Layer mix | 36 GQA |
| KV cache / token (bf16) | 36 KiB (Low) |
| License | MIT License |

**Key detail:** Standard Qwen2.5-Coder-style dense stack strengthened by curriculum SFT, MGPO RL, Long2Short RL, offline self-distillation, and Instruct RL.

## Architecture concepts

- [Grouped-Query Attention (GQA)](https://llm-atlas-7or.pages.dev/concepts/gqa.md): Several query heads share one key/value head, shrinking the KV cache with little quality loss.

## Links

- Architecture diagram: https://sebastianraschka.com/llm-architecture-gallery/images/architectures/vibethinker-3b.webp
- config.json: https://huggingface.co/WeiboAI/VibeThinker-3B/blob/main/config.json
- License: https://huggingface.co/WeiboAI/VibeThinker-3B/blob/main/LICENSE
- Tech report: https://arxiv.org/abs/2606.16140
- Source card (source of truth): https://sebastianraschka.com/llm-architecture-gallery/#card-vibethinker-3b
- Web page: https://llm-atlas-7or.pages.dev/models/vibethinker-3b/
- JSON: https://llm-atlas-7or.pages.dev/api/models/vibethinker-3b.json

_Data from Sebastian Raschka's LLM Architecture Gallery (https://sebastianraschka.com/llm-architecture-gallery/). Synced 2026-11-04._