Act party leader David Seymour has stayed loyal to an in-house agreement not to talk about the specifics of ongoing coalition negotiations but has dropped hints around the topics holding up the talks.

Interest in coalition negotiations reached an all-time high yesterday when Prime Minister-elect, Christopher Luxon met NZ First's Winston Peters and Seymour at the Pullman Hotel in Auckland - where a photo was taken of the three leaders together at last.

Luxon has been determined to bat away any attempts from the media to divulge the specifics of what has been discussed during prior meetings and Peters has barely spoken to any media in the first place.

But in an interview with the Mike Hosking Breakfast today, Seymour was willing to give a vague confirmation that the discussions around the Treaty of Waitangi and tax policies were the crunch points.

"I'm not supposed to say that," he responded when Hosking asked if the problems could be summed up as "tax and Treaty".

"We all promised each other we would not openly talk about what the coalition issues are."

Hosking pushed him on whether he was close to guessing the topics of contention.

"You can see from what the different parties campaigned on and what the different priorities are," Seymour responded but added Hosking's’ speculation “wouldn’t be unreasonable given that's the things the parties said were important going into the negotiations".

Seymour had been previously bullish about the chances of getting talks over the line in the coming days and was quick to agree that everybody in the room wanted the talks to go quicker.

He said nobody had the power to compel each other to move within a particular timeframe, but that the trio had worked through a large portion of issues and "really narrowed" what disagreement remained.

In rugby terms, he said, they weren't quite at the five-metre line but well within the 22.

Hosking asked about the reported Peters no-show and whether the veteran politician had failed to show up for a meeting, but Seymour said there was no meeting for him to attend.

"I think the media have really beaten this up," he said.

Seymour explained a core team of five people were involved in the negotiations and several others were advising the key players.

"But, of course, we've got our board as a party, we've got our caucus who have to lie in whatever bed we collectively make for the next three years, so those people are important too," he said.

The photo snapped at the Pullman yesterday demonstrated the possibility of taking three election competitors and bringing them to cooperation, Seymour added.

"As I said before the election, New Zealand faces enormous challenges and needs a government that gets stuck in," he said.

Hosking said some members of the public had voiced their desire to go back to the polls again, a suggestion Seymour rejected.

"I don't think that's necessary," he said.

"It would be a nuclear option if it wasn't possible to get a government together. There's a difference between it being slow and not possible."

Seymour said he'd spoken with project managers who had remarked that the project the three leaders were working on would need to last three years and required the appropriate foundations to be laid at the start.

"If it isn't looking good at the two-year mark, nobody will say 'Yeah, but that's okay because you got the deal done two days earlier'.

"It doesn't fill people with excitement, but we got some difficult balances between confidentiality and openness and transparency, speed and quality. We're doing what we can to get the best out of those trade-offs."