MiniCPM5-1B Leads Every Sub-2B Open-Weight Model by 7.4 Points on AA Intelligence Index
OpenBMB — the joint lab founded in 2022 by Tsinghua University’s NLP group and ModelBest Inc. — has released MiniCPM5-1B, a non-reasoning text-only model that scores 17.9 on the Artificial Analysis Intelligence Index. That puts it 7.4 points above the next-best sub-2B open-weight model and extends the Pareto frontier for intelligence versus parameter count at this scale.
The Numbers
| Model | Params | AA Intelligence Index |
|---|---|---|
| MiniCPM5-1B | 1B | 17.9 |
| Qwen3.5 2B (Reasoning) | 2B | 16.3 |
| MiniCPM-V 4.6 1.3B | 1.3B | 12.7 |
| Qwen3.5 0.8B (Reasoning) | 0.8B | 10.5 |
MiniCPM5-1B beats Qwen3.5 2B by 1.6 points at less than half the parameter count. It surpasses its own predecessor by 5.3 points at roughly 23% fewer parameters. No other open-weight model under 2B parameters had previously exceeded 15 on the Intelligence Index.
What the Model Does Not Do
MiniCPM5-1B is text-in, text-out only. It does not extend MiniCPM-V 4.6’s multimodal capability. The release is specifically positioned as an intelligence push at the 1B scale — the kind of model that runs on edge hardware, embedded devices, or serves as a fast inference layer in agentic pipelines where raw reasoning matters more than modality coverage.
The Efficiency Argument
At the sub-2B scale, the performance ceiling has historically been set by reasoning-augmented Qwen models. MiniCPM5-1B raises that ceiling without reasoning mode — which matters for latency-constrained deployments where chain-of-thought inference is expensive relative to the task.
The trajectory of the MiniCPM series — 12.7 to 17.9 in roughly one generation — reflects systematic efficiency improvements rather than raw scale increases. OpenBMB is competing on the intelligence-per-parameter curve, not the total compute curve.
Context on the Lab
OpenBMB is a relatively small team operating in a space dominated by Alibaba’s Qwen and Google’s Gemma series. The MiniCPM lineage has consistently punched above its lab size on edge benchmarks, and MiniCPM5-1B is the clearest statement yet that the sub-2B segment has a credible third competitor beyond the two dominant open-weight dynasties.