AP PHOTO Treasury Secretary Steven Mnuchin, makes a brief comment as he leaves the Capitol Wednesday in Washington. Mnuchin earlier met with House Speaker Nancy Pelosi of Calif.

WASHINGTON — House Speaker Nancy Pelosi and Treasury Secretary Steven Mnuchin held an “extensive conversation” Wednesday on a huge COVID-19 rescue package, meeting face to face for the first time in more than a month in a last-ditch effort to seal a tentative accord on an additional round of coronavirus relief.

After a 90-minute meeting in the Capitol, Pelosi issued a statement saying the two would continue to talk. “We found areas where we are seeking further clarification,” she said. Talks resume Thursday.

“We made a lot of progress over the last few days. We still don’t have an agreement,” Mnuchin said after meeting with Pelosi and briefing top Senate Republican Mitch McConnell.

At the very least, the positive tone set by Pelosi and Mnuchin represented an improvement over earlier statements. But there is still a considerable gulf between the two sides, McConnell said.

“I’ve seen substantial movement, yes, and certainly the rhetoric has changed,” White House Chief of Staff Mark Meadows said.

In an appearance on Fox Business Wednesday night, Mnuchin described the talks as the first serious discussions with Pelosi in “several weeks” and said he is raising his offer into “the neighborhood” of $1.5 trillion. That’s well above what many Senate Republicans want but would probably be acceptable to GOP pragmatists and senators in difficult races.

After initially saying the Democratic-controlled chamber would vote Wednesday night on a $2.2 trillion relief bill — a debate that would have been partisan and possibly unproductive — Pelosi made an about-face and postponed the vote until Thursday in hopes of giving the talks with Mnuchin greater breathing room.

At issue is a long-delayed package that would extend another round of $1,200 direct stimulus payments, restore bonus pandemic jobless benefits, speed aid to schools and extend assistance to airlines, restaurants and other struggling businesses. A landmark $2 trillion relief bill in March passed with sweeping support and is credited with helping the economy through the spring and summer, but worries are mounting that the recovery may sputter without additional relief.

Mnuchin said Wednesday morning that he would tender a new offer resembling a plan released a couple of weeks ago by the bipartisan Problem Solvers Caucus. That proposal was previously rejected by Pelosi and other top Democrats as inadequate. It totals about $1.5 trillion and would provide additional jobless benefits if unemployment remains unacceptably high.

The “top line” limit upon which Pelosi, the Trump administration and Senate Republicans might be able to agree has been a subject of considerable speculation. Pelosi had drawn a hard line until recently, and talks have foundered, but failure now could mean there wouldn’t be any COVID relief until next year, especially if Trump loses his reelection bid. Pelosi has never had a reputation for leaving large sums of money on the table.

Pelosi and Mnuchin have ramped up talks in recent days but remain far apart. The two have worked effectively together in the past and were key forces on the “CARES Act” in March, but the bipartisan spirit that drove that measure into law has all but evaporated. Neither side has publicly offered the kind of concessions that would generate tangible momentum.

McConnell said the two sides remain “very, very far apart,” though he spoke before being briefed on the Mnuchin-Pelosi meeting. GOP congressional aides said the two sides are not close, even as administration officials like Meadows and Mnuchin sounded more optimistic.