Breaking news! DeepSeek-Prover-V2-671B is quietly launched, paving the way for R2?

Written by
Iris Vance
Updated on:June-25th-2025
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DeepSeek-Prover-V2-671B quietly launched, or paving the way for R2? The mystery of this new model is about to be unveiled.

Core content:
1. The mysterious launch and parameter scale of DeepSeek-Prover-V2-671B
2. Review of the history and innovative highlights of V1.5
3. The potential impact of V2 launch on DeepSeek R2 and future prospects

Yang Fangxian
Founder of 53A/Most Valuable Expert of Tencent Cloud (TVP)

DeepSeek R2 didn’t arrive on May Day, but DeepSeek quietly released a super explosive new model: DeepSeek-Prover-V2-671B ! What is this? What does it mean for the future of DeepSeek?

Its predecessor: DeepSeek-Prover-V1.5

Back in August 2024, DeepSeek released a paper titled  DeepSeek-Prover-V1.5: Harnessing Proof Assistant Feedback for Reinforcement Learning and Monte-Carlo Tree Search [1]

At the same time, the corresponding base model was also open sourced: DeepSeek-Prover-V1.5-Base [2] .

V1.5 Key Highlights:

  • ✅ Fusion  supervised fine-tuning + reinforcement learning + improved MCTS (Monte Carlo Tree Search)
  • ✅ Proposed an innovative truncation and recovery mechanism to significantly improve the performance of the model in complex reasoning tasks
  • ✅ Emphasize "intrinsic reward-driven exploration" to push the boundaries of language model application in formal mathematical proofs
  • ✅ Multiple indicators surpass the best model of the previous generation

To sum up in one sentence: Not only do you understand the language, you can also "think" about how to prove it!

So what is Prover-V2?

Although the official paper or details have not yet been released, judging from the model name "V2" and the parameter scale "671B", this may be DeepSeek doing  capability verification or warm-up for R2 .

Looking back at the positioning of V1.5, it is more oriented towards the niche field of formal theorem proving. The launch of V2 may mean:

  • DeepSeek takes another big step forward in complex reasoning capabilities
  • It is expected to  integrate proof-based intelligence  into larger-scale general models
  • R2's "deep thinking" may be far beyond our previous expectations

summary

DeepSeek-Prover-V2-671B is now available on HuggingFace, but has not been promoted in a big way. This "secretly released" model may be the "trailer" of DeepSeek R2.

HuggingFace Address:https://huggingface.co/deepseek-ai/DeepSeek-Prover-V2-671B, come and watch quickly!

R2 has not come, but Prover-V2 has come first. The next step is not just a stronger model, but the path between "thinking" and "proof" of language intelligence.