PCMind-2.1-Kaiyuan-2B Technical Report

• URL: http://arxiv.org/abs/2512.07612v1
• Date: Mon, 08 Dec 2025 15:00:10 GMT
• Title: PCMind-2.1-Kaiyuan-2B Technical Report
• Abstract summary: We introduce PCMind-2.1-Kaiyuan-2B, a fully open-source 2-billion- parameter model focused on improving training efficiency and effectiveness under resource constraints.<n>Our methodology includes three key innovations: a Quantile Data Benchmarking method for systematically comparing heterogeneous open-source datasets.<n>We release all assets (including model weights, data, and code) under Apache 2.0 license at https://huggingface.co/thu-pacman/PCMind-2.1-Kaiyuan-2B.
• Score: 31.709484756045587
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: The rapid advancement of Large Language Models (LLMs) has resulted in a significant knowledge gap between the open-source community and industry, primarily because the latter relies on closed-source, high-quality data and training recipes. To address this, we introduce PCMind-2.1-Kaiyuan-2B, a fully open-source 2-billion-parameter model focused on improving training efficiency and effectiveness under resource constraints. Our methodology includes three key innovations: a Quantile Data Benchmarking method for systematically comparing heterogeneous open-source datasets and providing insights on data mixing strategies; a Strategic Selective Repetition scheme within a multi-phase paradigm to effectively leverage sparse, high-quality data; and a Multi-Domain Curriculum Training policy that orders samples by quality. Supported by a highly optimized data preprocessing pipeline and architectural modifications for FP16 stability, Kaiyuan-2B achieves performance competitive with state-of-the-art fully open-source models, demonstrating practical and scalable solutions for resource-limited pretraining. We release all assets (including model weights, data, and code) under Apache 2.0 license at https://huggingface.co/thu-pacman/PCMind-2.1-Kaiyuan-2B.

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