"To be coached by some of the best coaches in the world is definitely something pretty exciting."
Anscombe, a former New Zealand Under-20 representative, said he had a few overseas offers on the table but didn't want to pursue them.
"I didn't really look down that channel, to be honest. I was keen to stay in New Zealand. There were a few others but I think the Chiefs are suited to me and I'm really looking forward to going down to Hamilton."
Anscombe will serve as a back-up to All Blacks first-five Aaron Cruden and said he was fine with that prospect.
"There is a positive and negative there. Aaron has been playing really well and that's a positive. I can learn off him a lot. Sure, he's an All Black and I certainly accept that, but I'll be going down there to challenge him."
Auckland coach Wayne Pivac said: "We're pleased that Gareth is going to be playing Super Rugby, and so are the boys in the Blues. For him it's just a matter of working on his game and further developing his game. He knows what he's got to do and I'm pleased for him."
Kirwan, who has former Highlander Chris Noakes and untried Counties player Baden Kerr as his first-five options so far, has said he believes Anscombe is a player for the future but needs more experience.
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