It currently plays with the following limitations:

- only uses a pool of 17 heroes, instead of the 117 (iirc) heroes in regular Dota 2.

- no illusions. Meaning illusion runes don’t spawn, you can’t pick heroes that have illusions, and you can’t buy items that create illusions.

So it still isn’t playing full Dota. Definitely getting closer though.

Do they still have invulnerable couriers or was that restriction removed?

In the first game the OpenAI courier was repeatedly getting sniped, so it seems that's now normal.

I'm curious. What made you think that OpenAI Five is playing standard DOTA? I want to know what makes OpenAI propaganda so effective.

This. ^ And as a piggyback what makes OpenAI five radically different from when they were trounced last year? They scaled up the computing and trained more hours. Butdid anything change? People are still saying it was its micro not it's long term strategy that won the day. Furthermore people who know OG are suspicious that they threw the match because they said "that's not how they play, they made to many amateur mistakes". I'm highly suspicious about OpenAI especially with how they handled GPT-2. Talking to journalist before releasing anything else. Propaganda is definitely what it sounds like.