Introducing Zen 5 — Our Most Capable Model Yet
Zen 5 brings 1T+ parameter scale, 2M context windows, and state-of-the-art performance across reasoning, code, and multimodal tasks.
We're thrilled to announce the Zen 5 family — our most capable generation of foundation models, pushing the frontier of what open models can achieve.
What's New in Zen 5
Zen 5 represents a major leap forward across every dimension that matters:
Scale and Architecture
Zen 5 is built on the Zen MoDE (Mixture of Distilled Experts) architecture — a framework that combines the best of sparse expert routing with distillation from multiple frontier models. At 1T+ total parameters with intelligent expert activation, Zen 5 achieves flagship intelligence without the inference cost of a dense trillion-parameter model.
2M Context Window
Zen 5 supports 2 million tokens of context — enough to process entire codebases, multi-hour transcripts, or hundreds of research papers in a single request. This unlocks agentic workflows that simply weren't possible before.
The Zen 5 Family
| Model | Parameters | Context | Strengths |
|---|---|---|---|
| zen5 | 1T+ MoE | 2M | Flagship reasoning, all tasks |
| zen5-pro | 480B MoE | 512K | High capability, cost-efficient |
| zen5-ultra | 1T+ MoE | 2M | Maximum reasoning depth |
| zen5-mini | 14B | 128K | Fast, lightweight inference |
| zen5-max | 1T+ MoE | 2M | Enterprise scale |
| zen5-coder | 1T+ MoE | 2M | Code generation, software engineering |
Benchmark Performance
Zen 5 achieves state-of-the-art results on major benchmarks:
- MMLU: 92.1% (5-shot)
- HumanEval: 96.3% (pass@1)
- MATH: 91.7%
- GPQA Diamond: 75.2%
Open Weights
True to our commitment to open AI, Zen 5 weights are available on HuggingFace under the Zen Open License. The model runs efficiently in 4-bit quantization on consumer hardware using our optimized inference stack.
Getting Started
# Install the Zen models catalog
npm install @zenlm/models
# Use via the Hanzo API
curl https://api.hanzo.ai/v1/chat/completions \
-H "Authorization: Bearer $HANZO_API_KEY" \
-d '{"model": "zen5", "messages": [{"role": "user", "content": "Hello!"}]}'Or try it instantly at hanzo.chat.
What's Next
We're actively working on Zen 5 fine-tunes for specialized domains — medicine, law, materials science — and expanding multimodal capabilities. The next release will bring native video understanding and real-time audio processing to the Zen 5 family.
Stay tuned.