DeepSeek V4 Pro

DeepSeek's most advanced model for complex reasoning and deep analysis. DeepSeek V4 Pro delivers exceptional accuracy across coding, research, and beyond.

Gemini 3 Pro
Claude
GPT-5.2
Grok-4
DeepSeek V4

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Dive Deeper with DeepSeek V4 Pro

The most powerful open-weight model available — 1.6 trillion parameters, 1M context, frontier-class coding and reasoning at a fraction of closed-model pricing

The Largest Open-Weight Model Ever Released
DeepSeek V4 Pro is the flagship model of the DeepSeek V4 series, released April 24, 2026. With 1.6 trillion total parameters and 49 billion active per query, it currently holds the record as the largest open-weight model ever published. It delivers performance that rivals the world's top closed-source models across coding, reasoning, knowledge work, and agentic tasks — while remaining fully open under the MIT License and costing dramatically less per token than GPT-5.5 or Claude Opus. Inside Chat Smith, you get direct access to this frontier-class model without the enterprise pricing.
Best-in-Class Open-Source Coding
DeepSeek V4 Pro is the most capable open-weight model for software development tasks. It excels at planning complex features, writing production-quality code across multiple files, reviewing and refactoring large codebases, and assisting with difficult debugging sessions that require understanding how many pieces of a system interact. Whether you're a solo developer working on a personal project, a team lead managing a complex codebase, or a developer building AI-powered applications, V4 Pro brings the depth and reliability of a world-class engineering assistant directly into your Chat Smith workflow.
Richer World Knowledge Than Any Other Open Model
One of V4 Pro's standout strengths is its world knowledge. It leads all current open models in general knowledge and awareness of the world — trailing only Gemini 3.1 Pro among all models — which means conversations about current events, industry trends, business context, scientific concepts, and complex factual questions are handled with greater breadth and accuracy than any competing open model. This makes V4 Pro especially valuable for research-oriented tasks, writing that requires factual grounding, and any interaction where knowing a lot about the world matters.
Powerful Agentic Workflows With Tool Use
DeepSeek V4 Pro is the open-source leader in agentic coding benchmarks, excelling at complex multi-step tasks that require planning, tool use, code execution, and decision-making over extended interactions. Both Thinking and Non-Thinking modes are available, giving you the flexibility to run fast, direct responses when you need them and to activate deep step-by-step reasoning when the task genuinely demands it. For teams building AI pipelines, automating workflows, or delegating complex research and analysis tasks, V4 Pro is the most powerful open tool available today.
1M Context and Open Weights for Maximum Flexibility
V4 Pro ships with a 1 million token context window by default, allowing it to process entire codebases, lengthy research corpora, or complex multi-document analysis tasks without fragmentation. And because it's released under the MIT License with full weights available on Hugging Face, organizations have complete flexibility in how they access and deploy it — through Chat Smith for zero-friction access, through the API for application development, or self-hosted for privacy-sensitive environments. The combination of frontier power and open access is simply unmatched at this price point.

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What is DeepSeek V4 Pro?

DeepSeek V4 Pro is a high-capability large language model developed by DeepSeek AI, available through Chat Smith. It is a frontier-level model recognized for its exceptional performance on reasoning, mathematics, science, and coding tasks — delivering results that benchmark competitively with leading global AI models at a highly efficient inference cost. DeepSeek V4 Pro is designed for users who need strong analytical and technical capability in a powerful, versatile AI assistant.

How does DeepSeek V4 Pro differ from earlier DeepSeek models?

DeepSeek V4 Pro represents a significant generational advancement over previous DeepSeek releases, with improvements in reasoning depth, instruction-following accuracy, coding proficiency, and general knowledge breadth. It incorporates architectural innovations that enable strong performance with greater inference efficiency compared to earlier versions — delivering a better balance of capability and speed for demanding professional use cases.

What tasks is DeepSeek V4 Pro best suited for?

DeepSeek V4 Pro excels at technically demanding tasks including complex mathematical reasoning and problem-solving, advanced coding and algorithm design, scientific analysis and research synthesis, structured logical argumentation, data interpretation, technical writing, and multi-step question answering. It is particularly strong in STEM-related tasks and performs competitively across general language and reasoning benchmarks.

How good is DeepSeek V4 Pro at mathematics and scientific reasoning?

DeepSeek V4 Pro is one of the strongest available models for mathematical and scientific reasoning, benchmarking at a competitive level with leading frontier models on tasks like competition mathematics, physics problems, and scientific research comprehension. It can work through multi-step quantitative problems, apply formal logical frameworks, and produce well-structured, accurate technical explanations suitable for academic and professional contexts.

How does DeepSeek V4 Pro perform on coding tasks?

DeepSeek V4 Pro is an exceptional coding model that performs strongly across all major programming languages and paradigms. It generates production-quality code, designs complex algorithms and data structures, reviews and debugs codebases, writes comprehensive documentation, and explains technical implementations clearly. Its coding benchmarks are competitive with the best global coding models, making it an excellent choice for developers and engineering teams.

Can DeepSeek V4 Pro handle long documents and complex multi-turn conversations?

Yes. DeepSeek V4 Pro supports a large context window that allows it to process, reference, and reason over extensive text within a single session. This makes it well-suited for summarizing long technical documents, maintaining coherence across extended technical dialogues, analyzing research papers, reviewing lengthy codebases, and working through complex multi-step professional workflows.

How does DeepSeek V4 Pro compare to GPT-5 and Claude Opus?

DeepSeek V4 Pro benchmarks competitively with leading frontier models including GPT-5 and Claude Opus on reasoning, coding, and mathematics tasks. It is particularly noteworthy for delivering frontier-level performance with greater inference efficiency. While each model has distinct strengths — GPT-5 excels in multimodal tasks and general knowledge, Claude Opus in long-form writing depth and safety alignment — DeepSeek V4 Pro is a compelling choice for STEM-heavy, analytical, and coding-intensive workflows.

How can I get the best results from DeepSeek V4 Pro?

Provide detailed, well-structured prompts that clearly define the task, relevant constraints, desired output format, and any specific technical requirements. For mathematical or scientific problems, state all given variables and describe the expected approach. For coding tasks, specify the language, framework, performance requirements, and edge cases. DeepSeek V4 Pro performs best when given precise, technically complete instructions.

Is DeepSeek V4 Pro available for free on Chat Smith?

Chat Smith offers access to DeepSeek V4 Pro on applicable plans. Given its frontier-level capability, it may be available on paid plans or with usage limits on free tiers. Check the Chat Smith plans page for the most current details on model availability and usage allocations for your account type.

Does DeepSeek V4 Pro support multiple languages?

Yes. DeepSeek V4 Pro performs well across multiple major languages. It has particularly strong performance in English and Chinese, given DeepSeek AI's origins, and handles Spanish, French, German, Japanese, Korean, Arabic, Portuguese, Hindi, and other major languages with solid capability for writing, reasoning, translation, and analysis tasks.

Is DeepSeek V4 Pro safe and aligned?

DeepSeek V4 Pro is developed with safety and alignment considerations incorporated into its training process. It applies content moderation, declines harmful requests, and is designed to produce helpful, accurate, and responsible outputs. Chat Smith also applies its own content moderation and safety policies when serving DeepSeek V4 Pro through the platform, providing an additional layer of responsible AI deployment.

Who develops DeepSeek V4 Pro and why is it significant?

DeepSeek V4 Pro is developed by DeepSeek AI, a Chinese AI research company that has attracted significant global attention for producing frontier-level models with remarkable computational efficiency. DeepSeek's approach to model training has demonstrated that world-class AI performance can be achieved with innovative architecture and training techniques — positioning DeepSeek V4 Pro as an important and competitive option in the global large language model landscape available through Chat Smith.