We evaluated your and various T5-models on syntax: [Evaluating PaLM-FLAN-T5 and previous models on syntax](https://github.com/Bachstelze/clams/blob/master/combined_Evaluating_PaLM_Flan_T5_on_Syntax_20_03.pdf) Gramformer is the the grammar-tuned dot:  The evaluation suggests using [FLAN-T5-base](https://huggingface.co/google/flan-t5-base)