Qwen 3.5 397B
Qwen 3.5 397B is Alibaba's flagship open-source language model with 397 billion parameters, offering tool calling and a 128K token context window.
API Pricing
Cheapest on OpenRouter — 21% below avg| Provider | Input / 1M | Output / 1M | Updated |
|---|---|---|---|
| $0.390 | $2.34 | 4/14/2026 | |
| $0.600 | $3.60 | 4/14/2026 |
Prices updated daily. Last check: 4/14/2026
Model Details
General
- Creator
- Alibaba
- Family
- Qwen
- Tier
- Flagship
- Context Window
- 128K
- Modalities
- Text
Capabilities
- Tool Calling
- Yes
- Open Source
- Yes
- Subtypes
- Chat Completion, Code Generation
- Aliases
- qwen3-5-397b-a17b
Strengths & Limitations
- 397 billion parameters provide substantial model capacity for complex reasoning tasks
- Open-source license allows local deployment and custom fine-tuning
- Tool calling support enables integration with external APIs and functions
- 128K token context window handles lengthy documents and conversations
- Supports both chat completion and code generation modalities
- No vendor lock-in or API dependency requirements
- Model weights available for download and self-hosting
- Text-only input lacks multimodal capabilities like image or audio processing
- Requires significant computational resources due to 397B parameter size
- Smaller context window compared to some competing flagship models
- Self-hosting demands substantial GPU memory and infrastructure investment
- May have slower inference speeds than smaller models in the family
Key Features
About Qwen 3.5 397B
Common Use Cases
Qwen 3.5 397B is designed for organizations requiring a flagship-tier model with local deployment capabilities. Its 397B parameter scale makes it suitable for complex reasoning tasks, multi-step problem solving, and sophisticated code generation where model capability is prioritized over inference speed. The open-source nature makes it valuable for research institutions, enterprises with strict data privacy requirements, and developers building custom AI applications that need fine-tuning capabilities. The tool calling feature enables agentic workflows and integration with existing software systems, while the substantial parameter count supports demanding applications like advanced mathematical reasoning, complex document analysis, and multi-turn coding assistance.
Frequently Asked Questions
How much does Qwen 3.5 397B cost per million tokens?
Qwen 3.5 397B pricing varies by provider and deployment method, with some offering hosted API access while others provide infrastructure for self-hosting the open-source model. Check the pricing table above for current rates across all available providers.
What is Qwen 3.5 397B best used for?
Qwen 3.5 397B excels at complex reasoning tasks, advanced code generation, and multi-step problem solving where its 397B parameter scale provides advantages. It's particularly valuable for organizations needing flagship-tier capabilities with local deployment options, research applications requiring model customization, and agentic workflows leveraging its tool calling features.
What are the hardware requirements for running Qwen 3.5 397B locally?
Running Qwen 3.5 397B requires substantial GPU memory due to its 397 billion parameters. The exact requirements depend on precision (FP16, INT8, etc.) and serving configuration, but expect to need multiple high-memory GPUs or specialized inference hardware for practical deployment speeds.