Zen LM

Zen5LatestFrontier agentic — 256K–1M context, native tool use

Zen4StableProduction chat & code — MoE flagships and coders

Zen3Multimodal & specialty — vision, audio, image, safety

All modelsBrowse the full catalog — 95 open models

Zen Agentic DatasetNew10B+ tokens of real tool use and reasoning

Training DataCuration, sources, and methodology

On HuggingFaceDownload and license the datasets

Research PapersTechnical reports across the Zen family

Papers ArchiveFull paper archive — papers.zenlm.org

BlogResearch notes, deep dives, and releases

Zen5LatestChat with the frontier model — live now

Zen4StableChat with the production family

Zen APIOpenAI- & Anthropic-compatible. One key.

Zen ChatOpen the full chat experience

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Zen LM

95 open Zen models across Zen3, Zen4, and Zen5. Chat, code, vision, audio, image, embeddings, rerankers, and safety. OpenAI- and Anthropic-compatible API.

Zen 5

Zen5 Nano (0.8B - 9B)
Zen5 Flash
Zen5 Mini
Zen5 (default)
Zen5 Coder
Zen5 Pro
Zen5 Max

Zen 4

Zen4 / Zen4.1
Zen4 Ultra / Max / Pro
Zen4 Mini / Thinking
Zen4 Coder / Pro / Flash

Zen 3 Multimodal

Zen3 Omni / VL / Web
Zen3 Nano / Guard
Zen3 Embedding / Reranker
Zen3 Image / ASR / TTS

Resources

Training Data
HuggingFace
GitHub
Research Papers
Zen API

© 2026 Zen Authors. Open foundation models. Served on the Zen API.