DeepSeek-V4-Flash
Version: 2026-04-23
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Key capabilities
About this model
We present a preview version of the 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. 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.Key model capabilities
- 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.
Use cases
See Responsible AI for additional considerations for responsible use.Key use cases
The provider has not supplied this information.Out of scope use cases
Microsoft and external researchers have found Deepseek-V4-Flash to be less aligned than other models -- meaning the model appears to have undergone less refinement designed to make its behavior and outputs more safe and appropriate for users -- resulting in (i) higher risks that the model will produce potentially harmful content and (ii) lower scores on safety and jailbreak benchmarks. We recommend customers use Azure AI Content Safety in conjunction with this model and conduct their own evaluations on production systems.Pricing
Pricing is based on a number of factors, including deployment type and tokens used. See pricing details here.Technical specs
The provider has not supplied this information.Training cut-off date
The provider has not supplied this information.Training time
The provider has not supplied this information.Input formats
TextOutput formats
TextSupported languages
The provider has not supplied this information.Sample JSON response
The provider has not supplied this information.Model architecture
The provider has not supplied this information.Long context
The provider has not supplied this information.Optimizing model performance
The provider has not supplied this information.Additional assets
The provider has not supplied this information.Training disclosure
Training, testing and validation
The provider has not supplied this information.Distribution
Distribution channels
The provider has not supplied this information.More information
Learn more: original model announcement 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.Content filtering
When deployed via Microsoft Foundry, prompts and completions are passed through a default configuration of Azure AI Content Safety classification models to detect and prevent the output of harmful content. Learn more about Azure AI Content Safety . Configuration options for content filtering vary when you deploy a model for production in Azure AI; learn more .Responsible AI considerations
Safety techniques
The provider has not supplied this information.Safety evaluations
Microsoft and external researchers have found Deepseek-V4-Flash to be less aligned than other models -- meaning the model appears to have undergone less refinement designed to make its behavior and outputs more safe and appropriate for users -- resulting in (i) higher risks that the model will produce potentially harmful content and (ii) lower scores on safety and jailbreak benchmarks. We recommend customers use Azure AI Content Safety in conjunction with this model and conduct their own evaluations on production systems.Known limitations
The provider has not supplied this information.Acceptable use
Acceptable use policy
The provider has not supplied this information.Base Model
| 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 |
| World Knowledge | ||||
| AGIEval (EM) | 0-shot | 80.1 | 82.6 | 83.1 |
| MMLU (EM) | 5-shot | 87.8 | 88.7 | 90.1 |
| MMLU-Redux (EM) | 5-shot | 87.5 | 89.4 | 90.8 |
| MMLU-Pro (EM) | 5-shot | 65.5 | 68.3 | 73.5 |
| MMMLU (EM) | 5-shot | 87.9 | 88.8 | 90.3 |
| C-Eval (EM) | 5-shot | 90.4 | 92.1 | 93.1 |
| CMMLU (EM) | 5-shot | 88.9 | 90.4 | 90.8 |
| MultiLoKo (EM) | 5-shot | 38.7 | 42.2 | 51.1 |
| Simple-QA verified (EM) | 25-shot | 28.3 | 30.1 | 55.2 |
| SuperGPQA (EM) | 5-shot | 45.0 | 46.5 | 53.9 |
| FACTS Parametric (EM) | 25-shot | 27.1 | 33.9 | 62.6 |
| TriviaQA (EM) | 5-shot | 83.3 | 82.8 | 85.6 |
| Language & Reasoning | ||||
| BBH (EM) | 3-shot | 87.6 | 86.9 | 87.5 |
| DROP (F1) | 1-shot | 88.2 | 88.6 | 88.7 |
| HellaSwag (EM) | 0-shot | 86.4 | 85.7 | 88.0 |
| WinoGrande (EM) | 0-shot | 78.9 | 79.5 | 81.5 |
| CLUEWSC (EM) | 5-shot | 83.5 | 82.2 | 85.2 |
| Code & Math | ||||
| BigCodeBench (Pass@1) | 3-shot | 63.9 | 56.8 | 59.2 |
| HumanEval (Pass@1) | 0-shot | 62.8 | 69.5 | 76.8 |
| GSM8K (EM) | 8-shot | 91.1 | 90.8 | 92.6 |
| MATH (EM) | 4-shot | 60.5 | 57.4 | 64.5 |
| MGSM (EM) | 8-shot | 81.3 | 85.7 | 84.4 |
| CMath (EM) | 3-shot | 92.6 | 93.6 | 90.9 |
| Long Context | ||||
| LongBench-V2 (EM) | 1-shot | 40.2 | 44.7 | 51.5 |
Instruct Model
DeepSeek-V4-Pro and DeepSeek-V4-Flash both support three reasoning effort modes:| 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 | Special system prompt + <think> thinking </think> summary |
DeepSeek-V4-Pro-Max vs Frontier Models
| 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 | 87.5 |
| SimpleQA-Verified (Pass@1) | 46.2 | 45.3 | 75.6 | 36.9 | 38.1 | 57.9 |
| Chinese-SimpleQA (Pass@1) | 76.4 | 76.8 | 85.9 | 75.9 | 75.0 | 84.4 |
| GPQA Diamond (Pass@1) | 91.3 | 93.0 | 94.3 | 90.5 | 86.2 | 90.1 |
| HLE (Pass@1) | 40.0 | 39.8 | 44.4 | 36.4 | 34.7 | 37.7 |
| LiveCodeBench (Pass@1) | 88.8 | - | 91.7 | 89.6 | - | 93.5 |
| Codeforces (Rating) | - | 3168 | 3052 | - | - | 3206 |
| HMMT 2026 Feb (Pass@1) | 96.2 | 97.7 | 94.7 | 92.7 | 89.4 | 95.2 |
| IMOAnswerBench (Pass@1) | 75.3 | 91.4 | 81.0 | 86.0 | 83.8 | 89.8 |
| Apex (Pass@1) | 34.5 | 54.1 | 60.9 | 24.0 | 11.5 | 38.3 |
| Apex Shortlist (Pass@1) | 85.9 | 78.1 | 89.1 | 75.5 | 72.4 | 90.2 |
| Long Context | ||||||
| MRCR 1M (MMR) | 92.9 | - | 76.3 | - | - | 83.5 |
| CorpusQA 1M (ACC) | 71.7 | - | 53.8 | - | - | 62.0 |
| Agentic | ||||||
| Terminal Bench 2.0 (Acc) | 65.4 | 75.1 | 68.5 | 66.7 | 63.5 | 67.9 |
| SWE Verified (Resolved) | 80.8 | - | 80.6 | 80.2 | - | 80.6 |
| SWE Pro (Resolved) | 57.3 | 57.7 | 54.2 | 58.6 | 58.4 | 55.4 |
| SWE Multilingual (Resolved) | 77.5 | - | - | 76.7 | 73.3 | 76.2 |
| BrowseComp (Pass@1) | 83.7 | 82.7 | 85.9 | 83.2 | 79.3 | 83.4 |
| HLE w/ tools (Pass@1) | 53.1 | 52.0 | 51.6 | 54.0 | 50.4 | 48.2 |
| GDPval-AA (Elo) | 1619 | 1674 | 1314 | 1482 | 1535 | 1554 |
| MCPAtlas Public (Pass@1) | 73.8 | 67.2 | 69.2 | 66.6 | 71.8 | 73.6 |
| Toolathlon (Pass@1) | 47.2 | 54.6 | 48.8 | 50.0 | 40.7 | 51.8 |
Comparison across Modes
| 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 | 87.5 |
| SimpleQA-Verified (Pass@1) | 23.1 | 28.9 | 34.1 | 45.0 | 46.2 | 57.9 |
| Chinese-SimpleQA (Pass@1) | 71.5 | 73.2 | 78.9 | 75.8 | 77.7 | 84.4 |
| GPQA Diamond (Pass@1) | 71.2 | 87.4 | 88.1 | 72.9 | 89.1 | 90.1 |
| HLE (Pass@1) | 8.1 | 29.4 | 34.8 | 7.7 | 34.5 | 37.7 |
| LiveCodeBench (Pass@1) | 55.2 | 88.4 | 91.6 | 56.8 | 89.8 | 93.5 |
| Codeforces (Rating) | - | 2816 | 3052 | - | 2919 | 3206 |
| HMMT 2026 Feb (Pass@1) | 40.8 | 91.9 | 94.8 | 31.7 | 94.0 | 95.2 |
| IMOAnswerBench (Pass@1) | 41.9 | 85.1 | 88.4 | 35.3 | 88.0 | 89.8 |
| Apex (Pass@1) | 1.0 | 19.1 | 33.0 | 0.4 | 27.4 | 38.3 |
| Apex Shortlist (Pass@1) | 9.3 | 72.1 | 85.7 | 9.2 | 85.5 | 90.2 |
| Long Context | ||||||
| MRCR 1M (MMR) | 37.5 | 76.9 | 78.7 | 44.7 | 83.3 | 83.5 |
| CorpusQA 1M (ACC) | 15.5 | 59.3 | 60.5 | 35.6 | 56.5 | 62.0 |
| Agentic | ||||||
| Terminal Bench 2.0 (Acc) | 49.1 | 56.6 | 56.9 | 59.1 | 63.3 | 67.9 |
| SWE Verified (Resolved) | 73.7 | 78.6 | 79.0 | 73.6 | 79.4 | 80.6 |
| SWE Pro (Resolved) | 49.1 | 52.3 | 52.6 | 52.1 | 54.4 | 55.4 |
| SWE Multilingual (Resolved) | 69.7 | 70.2 | 73.3 | 69.8 | 74.1 | 76.2 |
| BrowseComp (Pass@1) | - | 53.5 | 73.2 | - | 80.4 | 83.4 |
| HLE w/ tools (Pass@1) | - | 40.3 | 45.1 | - | 44.7 | 48.2 |
| MCPAtlas (Pass@1) | 64.0 | 67.4 | 69.0 | 69.4 | 74.2 | 73.6 |
| GDPval-AA (Elo) | - | - | 1395 | - | - | 1554 |
| Toolathlon (Pass@1) | 40.7 | 43.5 | 47.8 | 46.3 | 49.0 | 51.8 |
Model Specifications
Context Length1000000
Quality Index0.72
LicenseCustom
Last UpdatedMay 2026
Input TypeText
Output TypeText
ProviderDeepSeek
Languages2 Languages
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