CARLSBAD, Calif. — Major League Baseball on Wednesday made an updated proposal for baseball’s reserve system, including a revised approach to eliminating salary arbitration.

Overall, the proposal is similar to the one the league made in August, people with knowledge of the discussions said. Like August’s proposal, Wednesday’s would grant players free agency at the age of 29 1/2 and do away with arbitration. The most significant change between the two versions is how player salaries would be determined prior to free agency.

In the August proposal, MLB offered to use a predetermined sum of money that would be distributed to eligible players, those who had reached at least three years of service time. This time, MLB is offering to pay players based on performance, specifically on a calculation of wins above replacement, or WAR. There are multiple variants of WAR, but MLB proposed to rely on FanGraphs’ version, or fWAR. A player’s career WAR would be part of the calculation, weighted for recency. Whether a player has been in the majors for three-plus, four-plus, or five-plus years would affect the calculation.

Performance already greatly influences the current arbitration system, under which players who have reached three years in the majors can go to a hearing to fight for a higher salary than the team proposes. But the current system nonetheless allows flexibility and room for players to argue to a third party for better salaries.

Full details of Wednesday’s proposal were not immediately known, but the players’ union is unlikely to see the proposal in a much better light than August’s version. One player agent said the proposal has “zero chance.”

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