Experience DeepSeek V4, China's open-source AI flagship. 1M token context, leading Agent capabilities, reasoning performance on par with top closed-source models. Free to use now at chat.deepseek.com.
DeepSeek V4 is the latest generation large language model from China's open-source AI leader DeepSeek. With 1M token context window, it leads in Agent capabilities, world knowledge, and reasoning performance among domestic and open-source models.
DeepSeek V4 is an AI assistant that understands Chinese better than GPT and has longer context than Claude - completely free to use.
1M token context window - process entire books, codebases, or hundreds of pages in one go.
Free to use at chat.deepseek.com with generous API free tier - excellent cost performance.
Five core reasons to choose DeepSeek V4
Traditional AI models have context limits of just tens of thousands of tokens. DeepSeek V4 breaks this bottleneck with 1M token context - let AI read entire books, codebases, or analyze hundreds of pages at once.
DeepSeek V4 is specially optimized for Claude Code, OpenClaw, OpenCode and other major Agent products. In Agentic Coding benchmarks, V4 achieves the best among current open-source models, outperforming Sonnet 4.5 and approaching Opus 4.6 non-thinking mode quality.
In math, STEM, and competitive coding reasoning tasks, DeepSeek V4 surpasses all publicly evaluated open-source models, achieving results on par with GPT-4, Claude, and other top closed-source models.
DeepSeek V4 offers Pro and Flash versions. Flash is smaller, faster, and cheaper; Pro is more powerful for complex reasoning and deep analysis.
DeepSeek V4 model weights are open source on HuggingFace and ModelScope with publicly available technical reports. Committed to long-termism - not seduced by praise, not frightened by criticism.
Two easy ways to start using DeepSeek V4
1. Open browser, visit chat.deepseek.com
2. Register or login (supports phone, WeChat)
3. Select DeepSeek V4 model, start chatting
4. Enjoy the power of 1M ultra-long context
DeepSeek V4 API is fully compatible with OpenAI format - just change the model parameter:
model = "deepseek-v4-pro" (Pro version, more powerful)
model = "deepseek-v4-flash" (Flash version, faster and cheaper)
Both versions support thinking mode - set reasoning_effort to adjust thinking intensity.
DeepSeek V4 provides comprehensive AI capabilities
1M token context window - process entire books in one input, cross-document analysis, DSA sparse attention mechanism for efficiency.
Full support for code writing, debugging, and optimization. Compatible with Claude Code, OpenClaw, OpenCode. Global understanding of complex projects.
Accurate math problem solving, STEM analysis, competition-level code generation, logical reasoning and common sense judgment.
User-controllable thinking intensity. Step-by-step reasoning for complex problems. Self-reflection and self-correction. Transparent and interpretable thinking process.
100% compatible with OpenAI ChatCompletions API, supports Anthropic format. Easy migration from existing projects. Complete official documentation.
Deeply optimized Chinese understanding and generation. Excellent performance in Chinese context. Understands Chinese internet culture better than GPT.
DeepSeek V4 is suitable for various practical applications
Feed entire product manuals, bidding documents, or legal contracts to DeepSeek V4. It extracts key points, identifies risks, and summarizes. 1M context enables precise "needle in haystack" information retrieval.
When newcomers take over legacy codebases, it often takes weeks to understand them. DeepSeek V4 can read entire repositories at once, quickly generate architecture diagrams, identify core logic, and explain function purposes - dramatically shortening onboarding time.
When reading papers, DeepSeek V4 can process dozens of papers simultaneously, helping you discover research trends, identify gaps, and compare different viewpoints across papers.
When writing novels, series articles, or complete reports, DeepSeek V4 remembers all previous details, maintaining narrative consistency and avoiding the "amnesia" problem common in AI writing.
DeepSeek V4's powerful Agent capabilities make it the best partner for automated workflows. Combined with Claude Code or OpenClaw, it can achieve complex automation tasks like automatic data analysis, report generation, and code review.
Common questions about DeepSeek V4
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