Instella is a series of high-performance open-source language models developed by the AMD GenAI team, trained on AMD Instinct™ MI300X GPUs. This model significantly outperforms other open-source language models of the same size and is comparable in functionality to models like Llama-3.2-3B and Qwen2.5-3B. Instella provides model weights, training code, and training data, aiming to promote the development of open-source language models. Its main advantages include high performance, open-source availability, and optimized support for AMD hardware.