Update README.md

README.md

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 - [AgentCPM-Explore](https://huggingface.co/openbmb/AgentCPM-Explore) The first open-source agent model with 4B parameters to appear on 8 widely used long-horizon agent benchmarks.
 - [AgentCPM-Explore-GGUF](https://huggingface.co/openbmb/AgentCPM-Explore-GGUF) The GGUF version of AgentCPM-Explore
 - [AgentCPM](https://github.com/OpenBMB/AgentCPM) Our code for AgentCPM Series
-- [UltraRAG](https://github.com/OpenBMB/UltraRAG) The low code RAG Framework
+- [UltraRAG](https://github.com/OpenBMB/UltraRAG) A RAG Framework, Less Code, Lower Barrier, Faster Deployment
 
 
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