I think it's 4D with normal time setting and fast computer (not that server's fast)
But the latest experiment version is 6D now (it's 7D in fast game in KGS)
But the exploitation of AI weakness is nothing new, it happened in computer chess too. But there'll be the time human just can't win against AI unless in a handicap game. Computer chess was already passed that point and I see no reason why computer go can't reach that point too.

So what? Making a strong program is a good achievement for AI scientists but, perhaps controversially, it has nothing to do with humans playing go. Would we feel it had any meaning for human abilities if a robot that moved on two "legs" could "run" 100 meters in 5 seconds?

How strong is Zenith Go, the commercial version of Zen?

I ask this question because of an interesting event in China. Weiqi TV there produced a series of programs to discuss AlphaGo. In today's program, Luo Xihe 9-dan, a former Samsung Cup winner, gave an unique view on AI. He suggested that any AI would have weakness which, once discovered, could be exploited by human players. To proof his point, he played a live game against Zenith Go , giving the AI a 9-stone handicap and beat it easily. He said he played many games against Zenith Go so presumably he knew that AI's weakness quite well.

Then there's this shocking opinion: Luo said he could probably give Alpha Go 4 stones. It doesn't look like a joke.

We'd feel very happy, for example, if driverless car is prove to drive 100x better than the best human driver with zero accident, I'd feel very happy to buy one because it means I've own a good car.

There are many human activities that computers have long ago surpassed human abilities. For example adding a list of 1000 10 digit integers.

Aged 18, he got a job working out the payroll for 160 people: this was a task that took him only a few hours, without the need for a calculator. However, he became unemployed a decade later when his employers decided to computerize payroll accounting, and he was replaced by two full-time accountants and a computer.

Yes. I would buy such a car if I could afford it. My point related to how many go players seem to think that the existence of a program that can play go well enough to defeat the strongest pros somehow diminishes humanity. Of course that is silly. There are many human activities that computers have long ago surpassed human abilities. For example adding a list of 1000 10 digit integers.

That video is a joke because the settings for Zen was completely wrong (set level rather than time). Can see how that mistake is made (Zen has a pretty counter intuitive setting where "5d" is weaker than 5 seconds per move and you can only select either strength or time), but can't believe no one at weiqitv realized and pointed it out.

We'd feel very happy, for example, if driverless car is prove to drive 100x better than the best human driver with zero accident, I'd feel very happy to buy one because it means I've own a good car.

As a Brit, I always chuckle when an American says "a semi". For the unaware, he means a truck/lorry.

Hu considered that this bot has reached a solid 5 dan amateur level under this setting.