<|system|>
Is the function $f(x) = 5^x - 5^{-x}$ even, odd, or neither?

Enter "odd", "even", or "neither".</s>.
<|user|>
Can you answer based on context?
<|assistant|>
Since
\[f(-x) = 5^{-x} - 5^x = -f(x),\]the function $f(x)$ is $\text{odd}.$