GPT-3 is popular.
It is not true that some giant language models do not have good performance.  All language models with good performance are used by some researchers. If a language model is used by some researchers, it is popular.  If BERT is a giant language model, then GPT-3 is also a giant language model.  BERT is a giant language model. 
¬(∃x (LanguageModel(x) ∧ Giant(x) ∧ ¬GoodPerformance(x))) ∀x ((LanguageModel(x) ∧ GoodPerformance(x)) → UsedBySomeResearchers(x)) ∀x (UsedBySomeResearchers(x) → Popular(x)) (LanguageModel(bert) ∧ Giant(bert)) → (LanguageModel(gpt-3) ∧ Giant(gpt-3)). LanguageModel(bert) ∧ Giant(bert) 