AFM-4.5B-Base

About

AFM-4.5B-Base is a 4.5 billion parameter foundation model from Arcee AI, pretrained on 8 trillion tokens (6.5 trillion of general data plus 1.5 trillion of midtraining data weighted toward mathematical reasoning and code). Its small size means it runs in deployment environments from cloud servers down to edge hardware, and it is published as a base checkpoint intended for teams that want to fine-tune their own variants rather than use a fixed assistant. It is distributed on Hugging Face under Apache 2.0 and works with Transformers, vLLM, SGLang, and Docker Model Runner.