xGen-small Technical Report
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Abstract (arXiv)
We introduce xGen-small, a family of 4B and 9B Transformer decoder models optimized for long-context applications. Our vertically integrated pipeline unites domain-balanced, frequency-aware data curation; multi-stage pre-training with quality annealing and length extension to 128k tokens; and targeted post-training via supervised fine-tuning, preference learning, and online reinforcement learning. xGen-small delivers strong performance across various tasks, especially in math and coding domains, while excelling at long context benchmarks.
Key facts. Cited by 1 paper in the map (data through 14 Oct 2026). Builds on 30 of its 33 references that are in the map. First posted on arXiv 10 May 2025.
Builds on
30 of 33 references.
References · 30
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18 more
- 2021RoFormer: Enhanced Transformer with Rotary Position Embeddingcited by 4,703
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Citing papers per year: 2025: 1.
1 paper.
- 2025Mid-Training of Large Language Models: A Surveycited by 21
- 2025Mid-Training of Large Language Models: A Survey8 Oct 2025
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