If you don't mind getting your hands dirty a bit, I think Nvidia's model [Jasper](https://arxiv.org/pdf/1904.03288.pdf) is near SOTA, and they have [pretrained models](https://ngc.nvidia.com/catalog/models/nvidia:jaspernet10x5dr) and [tutorials / scripts](https://nvidia.github.io/NeMo/asr/tutorial.html) freely available. The first is in their library "nemo", but they also have it available in [vanilla Pytorch](https://github.com/NVIDIA/DeepLearningExamples/tree/master/P...) as well.