Nanbeige4 Models by Nanbeige LLM Lab
2 models2025–2026Up to 256k ctx
Last refreshed 2026-09-07. Next refresh: weekly.
Details
ResearcherNanbeige LLM Lab
LicenseApache 2.0OSI-approved
Commercial useCommercial use: permitted
Models2
Released2025–2026
Max context256k
Capabilities
ReasoningAll models
JSON / Tool use1 of 2 models
About
Nanbeige4 is the fourth-generation model series from Nanbeige LLM Lab (BOSS Zhipin / Kanzhun Limited). Characterized by strong reasoning at small scale: 3B parameters pre-trained on 23 trillion tokens (Nanbeige4-3B), and the enhanced Nanbeige4.1-3B with 256K context and agentic capabilities. Both models are open-source and available on HuggingFace.
Decision facts
- Best fit
- chinareasoningJSON / Tool use
- Capability starting point
- Nanbeige4.1-3B with 256k context and reasoning and JSON / Tool use
- Lowest tracked input
- Not tracked
- Closest related family
- Unisound U2
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
2 in view
Nanbeige4.1-3BCurrent
Use when the workload needs 256k context, 4B parameters, and reasoning.
2026-02256k context4B parametersreasoning
Nanbeige4-3BCurrent
Use when the workload needs 64k context, 3B parameters, and reasoning.
2025-1264k context3B parametersreasoning
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| Nanbeige4.1-3B | Use when the workload needs 256k context, 4B parameters, and reasoning. | 2026-02 | 256k context4B parametersreasoning | Current |
| Nanbeige4-3B | Use when the workload needs 64k context, 3B parameters, and reasoning. | 2025-12 | 64k context3B parametersreasoning | Current |
Release Timeline
2 release groups2026-02
1 current
Nanbeige4.1-3B
Current256k context4B parametersreasoning
2025-12
1 current
Nanbeige4-3B
Current64k context3B parametersreasoning
Specifications(2 models)
| Model | Released | Context | Parameters | Reasoning | JSON / Tool use |
|---|---|---|---|---|---|
| Nanbeige4.1-3B | 2026-02 | 256k | 4B | Yes | Yes |
| Nanbeige4-3B | 2025-12 | 64k | 3B | Yes | No |
