Nanbeige4 Models by Nanbeige LLM Lab
Nanbeige LLM Lab releases · 3 in the last 12 monthsChangelog →
3 models2025–2026Up to 512K ctx
Last refreshed 2026-10-26. Next refresh: weekly.
Details
ResearcherNanbeige LLM Lab
LicenseApache 2.0OSI-approved
Commercial usePermitted
Models3
Released2025–2026
Max context512K
Capabilities
ReasoningAll models
JSON / Tool use2 of 3 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
- Nanbeige4.3-33B with 512K 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.
3 in view
Nanbeige4.3-33BCurrent
Use when the workload needs 512K context, 33B parameters, and reasoning.
2026-10512K context33B parametersreasoning
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 |
|---|---|---|---|---|
| Nanbeige4.3-33B | Use when the workload needs 512K context, 33B parameters, and reasoning. | 2026-10 | 512K context33B parametersreasoning | Current |
| 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
3 release groups2026-10
1 current
Nanbeige4.3-33B
Current512K context33B parametersreasoning
2026-02
1 current
Nanbeige4.1-3B
Current256K context4B parametersreasoning
2025-12
1 current
Nanbeige4-3B
Current64K context3B parametersreasoning
Specifications(3 models)
| Model | Released | Context | Parameters | Reasoning | JSON / Tool use |
|---|---|---|---|---|---|
| Nanbeige4.3-33B | 2026-10 | 512K | 33B | Yes | Yes |
| Nanbeige4.1-3B | 2026-02 | 256K | 4B | Yes | Yes |
| Nanbeige4-3B | 2025-12 | 64K | 3B | Yes | No |
