Introduction
We present a preview version of DeepSeek-V4 series, including two strong Mixture-of-Experts (MoE) language models — DeepSeek-V4-Pro with 1.6T parameters (49B activated) and DeepSeek-V4-Flash with 284B parameters (13B activated) — both supporting a context length of one million tokens.
DeepSeek-V4 series incorporate several key upgrades in architecture and optimization:
- Hybrid Attention Architecture: We design a hybrid attention mechanism combining Compressed Sparse Attention (CSA) and Heavily Compressed Attention (HCA) to dramatically improve long-context efficiency. In the 1M-token context setting, DeepSeek-V4-Pro requires only 27% of single-token inference FLOPs and 10% of KV cache compared with DeepSeek-V3.2.
- Manifold-Constrained Hyper-Connections (mHC): We incorporate mHC to strengthen conventional residual connections, enhancing stability of signal propagation across layers while preserving model expressivity.
- Muon Optimizer: We employ the Muon optimizer for faster convergence and greater training stability.
We pre-train both models on more than 32T diverse and high-quality tokens, followed by a comprehensive post-training pipeline. The post-training features a two-stage paradigm: independent cultivation of domain-specific experts (through SFT and RL with GRPO), followed by unified model consolidation via on-policy distillation, integrating distinct proficiencies across diverse domains into a single model.
DeepSeek-V4-Pro-Max, the maximum reasoning effort mode of DeepSeek-V4-Pro, significantly advances the knowledge capabilities of open-source models, firmly establishing itself as the best open-source model available today. It achieves top-tier performance in coding benchmarks and significantly bridges the gap with leading closed-source models on reasoning and agentic tasks. Meanwhile, DeepSeek-V4-Flash-Max achieves comparable reasoning performance to the Pro version when given a larger thinking budget, though its smaller parameter scale naturally places it slightly behind on pure knowledge tasks and the most complex agentic workflows.
Model Downloads
Table with columns: Model, #Total Params, #Activated Params, Context Length, Precision, Download| Model | #Total Params | #Activated Params | Context Length | Precision | Download |
|---|
| DeepSeek-V4-Flash-Base | 284B | 13B | 1M | FP8 Mixed | HuggingFace | ModelScope |
| DeepSeek-V4-Flash | 284B | 13B |
*FP4 + FP8 Mixed: MoE expert parameters use FP4 precision; most other parameters use FP8.
Evaluation Results
Base Model
Table with columns: Benchmark (Metric), # Shots, DeepSeek-V3.2-Base, DeepSeek-V4-Flash-Base, DeepSeek-V4-Pro-Base| Benchmark (Metric) | # Shots | DeepSeek-V3.2-Base | DeepSeek-V4-Flash-Base | DeepSeek-V4-Pro-Base |
|---|
| Architecture | - | MoE | MoE | MoE |
| # Activated Params | - | 37B | 13B | 49B |
| # Total Params | - | 671B | 284B | 1.6T |
Instruct Model
DeepSeek-V4-Pro and DeepSeek-V4-Flash both support three reasoning effort modes:
Table with columns: Reasoning Mode, Characteristics, Typical Use Cases, Response Format| Reasoning Mode | Characteristics | Typical Use Cases | Response Format |
|---|
| Non-think | Fast, intuitive responses | Routine daily tasks, low-risk decisions | </think> summary |
| Think High | Conscious logical analysis, slower but more accurate | Complex problem-solving, planning | <think> thinking </think> summary |
| Think Max | Push reasoning to its fullest extent | Exploring the boundary of model reasoning capability |
DeepSeek-V4-Pro-Max vs Frontier Models
Table with columns: Benchmark (Metric), Opus-4.6 Max, GPT-5.4 xHigh, Gemini-3.1-Pro High, K2.6 Thinking, GLM-5.1 Thinking, DS-V4-Pro Max| Benchmark (Metric) | Opus-4.6 Max | GPT-5.4 xHigh | Gemini-3.1-Pro High | K2.6 Thinking | GLM-5.1 Thinking | DS-V4-Pro Max |
|---|
| Knowledge & Reasoning | | | | | | |
| MMLU-Pro (EM) | 89.1 | 87.5 | 91.0 | 87.1 | 86.0 |
Comparison across Modes
Table with columns: Benchmark (Metric), V4-Flash Non-Think, V4-Flash High, V4-Flash Max, V4-Pro Non-Think, V4-Pro High, V4-Pro Max| Benchmark (Metric) | V4-Flash Non-Think | V4-Flash High | V4-Flash Max | V4-Pro Non-Think | V4-Pro High | V4-Pro Max |
|---|
| Knowledge & Reasoning | | | | | | |
| MMLU-Pro (EM) | 83.0 | 86.4 | 86.2 | 82.9 | 87.1 |
Chat Template
This release does not include a Jinja-format chat template. Instead, we provide a dedicated encoding folder with Python scripts and test cases demonstrating how to encode messages in OpenAI-compatible format into input strings for the model, and how to parse the model's text output. Please refer to the encoding folder for full documentation.
A brief example:
from encoding_dsv4 import encode_messages, parse_message_from_completion_text
messages = [
{"role": "user", "content": "hello"},
{"role": "assistant", "content": "Hello! I am DeepSeek.", "reasoning_content": "thinking..."},
{"role": "user", "content": "1+1=?"}
]
prompt = encode_messages(messages, thinking_mode="thinking")
import transformers
tokenizer = transformers.AutoTokenizer.from_pretrained("deepseek-ai/DeepSeek-V4-Pro")
tokens = tokenizer.encode(prompt)
How to Run Locally
Please refer to the inference folder for detailed instructions on running DeepSeek-V4 locally, including model weight conversion and interactive chat demos.
For local deployment, we recommend setting the sampling parameters to temperature = 1.0, top_p = 1.0. For the Think Max reasoning mode, we recommend setting the context window to at least 384K tokens.
License
This repository and the model weights are licensed under the MIT License.
Citation
@misc{deepseekai2026deepseekv4,
title={DeepSeek-V4: Towards Highly Efficient Million-Token Context Intelligence},
author={DeepSeek-AI},
year={2026},
}
If you have any questions, please raise an issue or contact us at service@deepseek.com.