Update README.md

README.md

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-As is, CARROT supports routing to the following collection of large language models.
+As is, CARROT supports routing to the following collection of large language models. Instantiating the CarrotRouter class automatically loads the trained predictors for ouput token count and performance that are provided below. You may set $\mu$ to control the priority given to performance vs cost! 
 
 |                      | claude-3-5-sonnet-v1 | titan-text-premier-v1 | openai-gpt-4o | openai-gpt-4o-mini | granite-3-2b-instruct | granite-3-8b-instruct | llama-3-1-70b-instruct | llama-3-1-8b-instruct | llama-3-2-1b-instruct | llama-3-2-3b-instruct | llama-3-3-70b-instruct | mixtral-8x7b-instruct | llama-3-405b-instruct |
 |----------------------|---------------------|----------------------|---------------|--------------------|----------------------|----------------------|----------------------|----------------------|----------------------|----------------------|----------------------|----------------------|----------------------|