DeepSeek-V2
Last Updated on: Sep 12, 2025
DeepSeek-V2
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What is DeepSeek-V2?
DeepSeek V2 is an open-source, Mixture‑of‑Experts (MoE) language model developed by DeepSeek-AI, released in May 2024. It features a massive 236 B total parameters with approximately 21 B activated per token, supports up to 128 K token context, and adopts innovative MLA (Multi‑head Latent Attention) and sparse expert routing. DeepSeek V2 delivers top-tier performance on benchmarks while cutting training and inference costs significantly.
Who can use DeepSeek-V2 & how?
  • Developers & Engineers: Build efficient chatbots, reasoning pipelines, and coding assistants with a high context window.
  • Researchers & AI Practitioners: Run advanced benchmarks across reasoning, math, code, and multilingual tasks.
  • Enterprises & API Users: Deploy via Hugging Face, DeepSeek API, or Bedrock Chat for production-grade integration.
  • Data & Analytics Teams: Utilize long-context summarization, Q&A, retrieval, and knowledge extraction.
  • Open-Source Community: Self-host or fine-tune via MIT-licensed weights; use dedicated vLLM support for local deployment.

How to Use DeepSeek V2?
  • Get the Model: Download base/chat versions (128K context) from Hugging Face or use hosted API endpoints.
  • Install Runtime: Use Optimized vLLM inference setup or Transformers integration for efficient use.
  • Send Prompts: Provide up to 128K-token inputs in text, code, or reasoning prompts.
  • Use Chat Variant: For conversational outputs; includes RL fine-tuning for improved alignment.
  • Monitor & Deploy: Tune temperature, use function calling, and scale with enterprise reliability.
What's so unique or special about DeepSeek-V2?
  • Very Large Context: Supports 128K-token windows via YaRN architecture.
  • Efficient MoE Design: 236B total with only 21B active per token—42% lower training cost and 5.76× faster throughput.
  • Benchmark Powerhouse: Delivers competitive scores: 78 MMLU, 84 Chinese MMLU, 79 Math, 49 HumanEval on code.
  • Open-Source with RL & SFT: Offers SFT and RL-tuned chat models with strong alignment and rationale.
  • High Throughput Inference: MLA halves KV cache, enabling high-speed, low-memory use in long contexts.
Things We Like
  • Massive 128 K context window for long-document handling
  • Efficient compute: powerful MoE with smaller active footprint
  • Strong benchmark results across language, math, code, and Chinese
  • Open-weight model with MIT license and inference optimizations
  • Chat/ RL versions for conversational use, hosted and local options
Things We Don't Like
  • Requires high VRAM and optimized runtimes for efficiency
  • Chat variant slightly trails closed-source best (e.g., GPT‑4)
  • Open-source inference performance may lag proprietary systems without tuning
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FAQs

An open-source MoE LLM with 236B params (21B active), 128K context, and high performance in reasoning and code.
Up to 128,000 tokens, thanks to the YaRN mechanism.
Active compute is 21 B parameters, reducing training cost by 42% and speeding throughput 5.76×.
78 MMLU, Math 79 GSM8K, HumanEval ~48–66, and high Chinese and coding performance.
Yes—base and chat variants available; chat includes supervised fine-tuning and RL-tuning.

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