qwen3.5:397b

Qwen3.5-397B-A17B is the first open-weight release in the Qwen3.5 series, positioned as a native vision-language foundation model aimed at reasoning, coding, agent tasks, and broad multimodal understanding. Its early-fusion training on multimodal tokens lets it accept image inputs alongside text and produce text outputs, giving teams a single model for grounded analysis, document and chart interpretation, and conversational interfaces rather than a stitched-together vision pipeline. The model is intended for developers and enterprises that need production-grade reasoning with deployable weights, and it slots into existing stacks because the artifacts are published in the Hugging Face Transformers format and are compatible with vLLM, SGLang, and KTransformers for self-hosted inference.

Under the hood, the model uses an efficient hybrid architecture that fuses linear attention via Gated Delta Networks with a sparse Mixture-of-Experts design, totaling 397 billion parameters while activating only 17 billion per forward pass. That combination targets high-throughput inference with low latency, which is what makes a model this large practical for agent-style workloads that chain many calls together. It also expands supported languages and dialects from 119 to 201, improving accessibility for global applications. Teams that want a managed alternative can use the hosted Qwen3.5-Plus counterpart on Alibaba Cloud Model Studio, which adds a 1M context window and built-in tool features, while the open-weight build itself is a strong fit for teams that prefer to control their own serving stack.