United Auto Workers President Shawn Fain is to update members Friday afternoon on progress in contract talks with Detroit's three automakers as General Motors increased its offer to the union in an effort to end a strike.

In a statement, GM said it made an offer Friday with “substantial movement in all key areas in an effort to reach a final agreement with the UAW and get our people back to work.”

The company says the offer raises pay for most of the work force to US$40.39 per hour, or about $84,000 per year by the end of a four-year contract. That's a 23 per cent increase over the $32.32 per hour that most factory workers make. Compounded annually it's 25 per cent.

The company also said it reinstated cost of living raises for many employees in the first year of the contract, boosting the pay increase to over 30 per cent by September of 2027. Workers gave up the inflation-fighting raises in 2007 when the companies were in financial trouble.

GM previously had offered to contribute eight per cent of a worker's salary into 401(k) defined contribution plans.

The UAW had no immediate comment on the increased offer, but it had been seeking 36 per cent raises over the four years. GM's wage offer was similar to one made earlier by Ford.

The union said in a statement that Fain's update comes after “a week of intensive negotiations” with the companies.

Stephen McCray, one of the striking GM workers at a factory in Wentzville, Missouri near St. Louis, said the company's latest offer seems to be good, but he is suspicious that GM will wait a year to give cost of living increases.

A former temporary worker, he's concerned that part-time temps won't be converted to full time in the deal. That said, McCray thinks workers will ratify the contract because of the raises, cost of living pay, and other benefits, if Fain tells workers this is the best deal he could get.

“If this is what he's going to bring to the table, after everything that has been going on since September, I believe it will be ratified,” McCray said. “This might be the best that they might bring out.”

But Adrian Mitchell, a striking worker at GM's parts warehouse in Van Buren Township, Michigan, said increases in the 401(k) payment and for retirement health care aren't big enough. He doesn't think there's enough yet for a tentative agreement. “I think he should maybe fight a little more at the table to try to get a few more things,” Mitchell said.

Tony Totty, a local union president at a GM transmission plant in Toledo, Ohio, said workers are concerned that a five per cent increase in pensions for traditional workers isn't enough. “Everybody I talk to, that's dead on arrival,” he said.

Yet Marick Masters, a business professor at Wayne State University in Detroit, said the GM offer has the potential to be a breakthrough that could bring agreements to end the union's 5-week-old strikes against GM, Ford and Jeep maker Stellantis.

“That moves them closer, and I think that it may not take much from that point” to reach a deal, he said.

Fain is scheduled to do a live video appearance Friday afternoon to update workers on the bargaining. He could call on more workers to strike and join the 34,000 already off the job at six vehicle assembly plants and 38 parts distribution warehouses.

Fain will add more plants to the strikes depending on how much progress each company has made, Masters said. But he expects that GM will be spared this round due to its offer.

Masters said in order to settle with all three, Ford and Stellantis will have to join GM in agreeing to include future electric vehicle battery factories in the UAW national agreement. That would essentially ensure that the factories of the future would be represented by the union, a key point for the UAW.

Last week, before GM agreed to the battery plant provisions, the union had threatened to close a GM factory in Arlington, Texas, which makes highly profitable large SUVs.

The union's strikes at targeted plants at each company began on Sept. 15 and are nearing the start of their sixth week.

GM was to meet with the union on Friday. There also were meetings on Thursday with Jeep maker Stellantis.

The UAW also is seeking restoration of defined benefit pensions that workers gave up in the Great Recession, pension increases for retirees, an end to varying tiers of wages for workers and other items. GM's offer appears to end the tiers in the last year of the new contract.

GM said Thursday that it can't give Fain everything he wants because it needs profits to invest in future vehicles and factories. Ford and Stellantis have made similar comments, with Ford saying it has reached the limit on how much it can spend to settle the strike.

The union, however, says labour expenses are only about five per cent of a vehicle's costs, and the companies can divert money from profits and stock buybacks to pay for raises that cover inflation and make up for years of contracts without significant increases.

The strikes started with one assembly plant from each company, and the union later added the parts warehouses, then one assembly plant each from Ford and GM. Last week the union made a surprise move, escalating the strikes by adding a huge Ford pickup truck and SUV plant in Louisville, Kentucky.

About 23 per cent of the union's 146,000 members employed by the three automakers are on strike.