DeepSeek V4.1 Flash
Hugging Face (open weights) Open weights
The catch: No Jinja chat template ships: prompts are encoded with DeepSeek's Python reference code or its deepseek-recipe libraries, and the card gives no vLLM or SGLang command.
| Access | Open weights |
|---|---|
| Free limits | Free to download and self-host; you pay only for your own compute. 552B backbone parameters plus a 196B Engram memory (MoE); activates 8B parameters per token in prefill and 16B in decode, so it needs multi-GPU. 1M-token context; reads images and text. Released 10 Sep 2026. |
| Modality | text, code, image |
| Credit card | Not required |
| Commercial use | Allowed |
| Trains on your data | – |
| Licence or terms | MIT |
| Context window | 1,048,576 tokens |
| Model id | deepseek-ai/DeepSeek-V4.1-Flash |
| Base URL | – |
| Last checked | 8 Oct 2026 |
How to use DeepSeek V4.1 Flash
Download the weights and serve them yourself. Licence: MIT.
Paste into Claude Code
I want to run the open-weight model "DeepSeek V4.1 Flash" (deepseek-ai/DeepSeek-V4.1-Flash) for my project. Please: 1. Check the model card and tell me the hardware it needs and the simplest way to serve it (vLLM, SGLang, Ollama or a hosted endpoint). 2. Give me a minimal working setup and a test request. 3. Tell me the licence terms for commercial use. 4. If a cheaper or smaller variant would do the job, mention it.
Before you ship on it
- No Jinja chat template ships: prompts are encoded with DeepSeek's Python reference code or its deepseek-recipe libraries, and the card gives no vLLM or SGLang command.
- MIT License: use, modify and sell freely; keep the copyright and permission notice. The card says the repository and the model weights are licensed under the MIT License.
- Free to run means you pay for the GPUs, the serving stack and the on-call.
Questions
Is DeepSeek V4.1 Flash free?
Yes. Open weights offers it as open weights, with these limits: Self-host free · MIT. No credit card is needed.
Can I use DeepSeek V4.1 Flash commercially?
Yes, under MIT. Check the current terms before you ship.
How do I start with DeepSeek V4.1 Flash?
Download the weights and serve them yourself. Licence: MIT.
Source: huggingface.co/deepseek-ai/DeepSeek-V4.1-Flash, checked 8 Oct 2026.