GigaTrain provides an efficient and scalable training framework for developing large AI models. It offers unified distributed training across multi-GPU and multi-node environments, supporting DeepSpeed ZeRO, FSDP, FSDP2, and DDP strategies. The framework includes mixed precision training (FP16/BF16/FP8), gradient accumulation and checkpointing, EMA, built-in monitoring, and robust checkpointing for resumable long runs. It uses a registry-driven modular design with pluggable components for optimizers, schedulers, and transforms.