回复：ask about treaty($5,000)

Because you are in the 6th year, you are RA. But even if you are an RA, you can use $5000 treaty. But cannot have standard deduction. This is 5000 vs. 4750 so using treaty does not give you a lot of advantages.

Your wife cannot use treaty because she did not enter US with an F-1.

So the best approach is:

file joint return. choose to treat your wife (non-resident spouse) as resident. See pub 519 page 10. you can have two exemptions (2x 3050) and std deduction of 9500.