Haas team boss Gunther Steiner has been impressed by Formula 1 rival Renault’s upturn in form but says it has a long way to go to fight at the front.
Jolyon Palmer scored his first points of the season with sixth in the Singapore Grand Prix to move Renault above Haas into seventh in the constructors' championship.
"They have done a good job," he said. "They are a big company, that's what they should be doing if you compare them with us. It's not a 'wow' factor.
"That's something. but they have over 600 people now, so they are almost like Red Bull now.
"They do a good job but they are beating us, but they are beating us, they are not beating one of the big ones. They have a long way to go."
The fight for fifth in the constructors' championship is tight, with Williams leading the way on 59, seven clear of Toro Rosso, which closed the gap after Carlos Sainz's brilliant fourth-place finish in Singapore.
Renault, which feels it has the fourth-fastest car on the grid, is now 10 points adrift in seventh, with Haas a further five back in eighth.
When asked if Haas could expect to reclaim seventh or move any higher, Steiner said it would be "difficult, but not impossible".
He added: "It's so tight together. If we have a good weekend, both cars in the points, all of a sudden you swap again.
"It's not like next weekend, we're going to finish fourth and fifth. But we can swap. Toro Rosso scored well in Singapore as well. You always have to push hard."