DeepSeek-R1-Zero
Last Updated on: Sep 12, 2025
DeepSeek-R1-Zero
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What is DeepSeek-R1-Zero?
DeepSeek R1 Zero is an open-source large language model introduced in January 2025 by DeepSeek AI. It is a reinforcement learning–only version of DeepSeek R1, trained without supervised fine-tuning. With 671B total parameters (37B active) and a 128K-token context window, it demonstrates strong chain-of-thought reasoning, self-verification, and reflection.
Who can use DeepSeek-R1-Zero & how?
  • Researchers & Academics: Explore RL-driven reasoning architectures without SFT bias.
  • Developers & Experimenters: Examine pure RL patterns like self-verification and long-form logic.
  • Open-Source Enthusiasts: Leverage MIT-licensed weights for building or fine-tuning advanced models.
  • Benchmarkers: Study model behavior in reasoning-heavy tasks, especially with chain-of-thought.
  • Tooling & Safety Teams: Investigate RL-induced behaviors, repetition, language mixing, and safety implications.

How to Use DeepSeek R1 Zero?
  • Load Model Weights: Available via Hugging Face (`deepseek-ai/DeepSeek-R1-Zero`).
  • Provide Prompts: Supply up to 128K tokens for chain-of-thought tasks—e.g., math proofs, code debugging.
  • Run and Observe: Expect reasoning paths, but note issues: longer text repetition, mixed-language outputs.
  • Use for Research: Compare against DeepSeek R1 (which adds SFT) to evaluate RL-only reasoning behaviors.
  • Quantify Issues: Common failure modes include readability degradation and language switching.
What's so unique or special about DeepSeek-R1-Zero?
  • RL-Only Chain-of-Thought: First open model trained by pure RL, generating reasoning traces without SFT seeding.
  • High Performance: Activates 37B params at inference; rivals GPT-4-o1 in reasoning tasks.
  • Open-Source & MIT License: Freely inspect or fine-tune its weights and outputs.
  • Large Context Window: 128K tokens support extended logic flows, math proofs, document analysis.
  • Baseline for Comparison: Acts as a research benchmark to evaluate effects of RL vs SFT in reasoning.
Things We Like
  • Pure RL strategy highlights capability to learn chain-of-thought autonomously
  • Open-weight and permissive licensing spur community innovation
  • Large context is useful for complex reasoning tasks
  • Self-verification and reflection emerge naturally
  • Enables study of reasoning without supervised data biases
Things We Don't Like
  • Outputs may loop, switch languages, and degrade readability
  • Less polished than RL+SFT variant (DeepSeek R1) in clarity and format
  • Lacks distilled-menu smaller models—large size may be heavy for many users
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FAQs

An RL-only version of DeepSeek R1 with 671B parameters (37B active), trained without supervised fine-tuning, released January 2025.
Using purely large-scale reinforcement learning without any SFT phase—encouraging chain-of-thought behavior.
Up to 128,000 tokens—ideal for long reasoning chains.
What are its drawbacks?
DeepSeek R1 uses SFT follow-up to clean up readability and fix language mixing, whereas R1 Zero reflects raw RL patterns.

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