The remarks by coalition spokesman, Col. Ryan Dillon, came as coalition allies were working out ways to safely evacuate an estimated 4,000 civilians who remain trapped in the city.
The coalition has said IS militants are holding some civilians as human shields, preventing them from escaping as the fight enters its final stages.
The city, on the banks of the Euphrates River, has been badly damaged by the fighting, and activists have reported that over 1,000 civilians have been killed there since June.
Dillon said the Raqqa Civil Council, a local administration of Arab and Kurdish officials, was leading the discussions to ensure the safe evacuation of civilians.
However, it was not clear with whom the council is speaking inside Raqqa. A Kurdish-led force, the Syrian Democratic Forces, is leading the battle on the ground.
"We are seeing some good progress of civilians that are being able to safely exit Raqqa. The trend has turned into ... a broader effort by the Raqqa Civil Council to get the remaining civilians out of there," Dillon told The Associated Press.
But Dillon added that discussions about the fate of the militants remaining in the city have focused on "unconditional surrender."
A negotiated withdrawal "is absolutely something that we as a coalition would not be a part of or agree with," Dillon added. Between 300 and 400 militants are believed to be holed up in about four square kms of Raqqa, including in the city's stadium and a hospital, he said.
The stadium is believed to be used by the militants as weapons warehouse and a prison while the hospital is one of their major headquarters.
Airstrikes on the city appeared to have decreased recently, apparently to allow for the evacuations. The coalition reported just five airstrikes near Raqqa yesterday.
The extremist group has suffered a series of major battlefield defeats in both Iraq and Syria in recent months, but has continued to stage attacks far from the front lines.
At least three suicide bombers struck outside the police headquarters in central Damascus today, killing at least two people and wounding others, according to the Syrian interior minister.
The pro-government Al-Ikhbariya TV today showed pictures from outside the heavily guarded police headquarters, which is encircled by blast walls. The street was littered with shrapnel but there was no sign of other damage.
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