Works for me with Claude 3.5:

Me: How many Rs are in the word strawberry? Think step by step

Claude: Let's approach this step-by-step:

1. First, let's write out the word: strawberry

2. Now, let's go through each letter one by one: s - not an R t - not an R r - this is an R (count: 1) a - not an R w - not an R b - not an R e - not an R r - this is another R (count: 2) r - this is a third R (count: 3) y - not an R

3. After going through all the letters, we've counted 3 Rs.

Therefore, there are 3 Rs in the word "strawberry".