Labour leader Andrew Little says a poll that shows his party has slumped to just 26 per cent doesn't stack up with other recent surveys.

The One News Colmar-Brunton poll was released on Monday night, and Mr Little described it as bogus.

He's now drawing comparisons with other polls.

"There have been two other recent polls that I have seen that have shown completely different results," he said on Tuesday.

"And there was one published two or three weeks ago that was even better than our internal polling."

The poll showed Labour losing three points since June, while National was steady on 48 per cent.

Prime Minister John Key doesn't doubt the figures.

"It's pretty close to what we've been seeing for a while," he said.

"Andrew is getting angry with the polls, but the real issue is a trend we've been seeing in our polls - once Labour married the Greens, centrist voters don't see them as a credible option."

The One News poll showed the Greens up one point to 13 per cent and NZ First up two points to 11 per cent.

The results meant that if an election was held now, National would be able to form a government with its existing partners.