Update README.md

README.md

@@ -30,7 +30,7 @@ We also have other two MiniCheck model variants:
 ### Model Performance
 The performance of these models is evaluated on our new collected benchmark (unseen by our models during training), [LLM-AggreFact](https://huggingface.co/datasets/lytang/LLM-AggreFact), 
 from 10 recent human annotated datasets on fact-checking and grounding LLM generations. Our most capable model MiniCheck-Flan-T5-Large outperform all
-exisiting specialized fact-checkers with a similar scale by a large margin (4-10% absolute increase) and is on par with GPT-4. See full results in our work.
+exisiting specialized fact-checkers with a similar scale by a large margin (4-10% absolute increase) and is on par with GPT-4, but 400x cheaper. See full results in our work.
 
 Note: We only evaluated the performance of our models on real claims -- without any human intervention in 
 any format, such as injecting certain error types into model-generated claims. Those edited claims do not reflect