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Fast-LLM is an open-source library from ServiceNow Research's Foundation Models Lab designed to train large language models with unmatched speed, scalability, and cost-efficiency. It provides unified GPT-like architecture support, optimized GPU kernels, and memory-efficient parallelism to handle models from around 1B to 70B+ parameters, adapting parallelism strategies by scale. The project is community-driven and invites contributions on GitHub, targeting researchers, AI/ML engineers, academic and industrial labs, and enterprise product teams pushing generative AI.
AI named Fast-LLM in December 2025.