DeepSeek-V4 Preview: Entering the Era of Affordable Million-Token Context

DeepSeek-V4 Preview is officially live & open-sourced! Welcome to the era of cost-effective 1M context length.

• DeepSeek-V4-Pro: 1.6T total / 49B active params. Performance rivaling the world's top closed-source models.
• DeepSeek-V4-Flash: 284B total / 13B active params. Your fast, efficient, and economical choice.

Try it now at chat.deepseek.com via Expert Mode / Instant Mode. API is updated & available today!

• DeepSeek-V4 Open Weights - Hugging Face
• DeepSeek-V4 Technical Report - arXiv

DeepSeek-V4-Pro

• Enhanced Agentic Capabilities: Open-source SOTA in Agentic Coding benchmarks.
• Rich World Knowledge: Leads all current open models, trailing only Gemini-3.1-Pro.
• World-Class Reasoning: Beats all current open models in Math/STEM/Coding, rivaling top closed-source models.

DeepSeek-V4-Flash

• Reasoning capabilities closely approach V4-Pro.
• Performs on par with V4-Pro on simple Agent tasks.
• Smaller parameter size, faster response times, and highly cost-effective API pricing.

Structural Innovation & Ultra-High Context Efficiency

• Novel Attention: Token-wise compression + DSA (DeepSeek Sparse Attention).
• Peak Efficiency: World-leading long context with drastically reduced compute & memory costs.
• 1M Standard: 1M context is now the default across all official DeepSeek services.

Dedicated Optimizations for Agent Capabilities

• DeepSeek-V4 is seamlessly integrated with leading AI agents like Claude Code, OpenClaw & OpenCode.
• Already driving our in-house agentic coding at DeepSeek.

The figure below showcases a sample PDF generated by DeepSeek-V4-Pro.

API is Available Today!

• Keep base_url, just update model to deepseek-v4-pro or deepseek-v4-flash.
• Supports OpenAI ChatCompletions & Anthropic APIs.
• Both models support 1M context & dual modes (Thinking / Non-Thinking): Thinking Mode Guide - API Docs

Note: deepseek-chat & deepseek-reasoner will be fully retired and inaccessible after Jul 24th, 2026, 15:59 (UTC Time). Currently routing to deepseek-v4-flash non-thinking/thinking.

• Amid recent attention, a quick reminder: please rely only on our official accounts for DeepSeek news. Statements from other channels do not reflect our views.
• Thank you for your continued trust. We remain committed to longtermism, advancing steadily toward our ultimate goal of AGI.