** Shares of Chinese AI startup MiniMax Group 0100.HK jump 25.7% to HK$854.5, highest level since Jan 9 debut
** Stock set for its biggest one-day pct rise since Jan 27; third straight session of gain
** MiniMax released M2.5 open-source model on Friday, saying the performance matches leading models in productivity scenarios in programming, tool invocation and search, and office tasks
** Model's strength is its cost efficiency, SCMP reported, citing MiniMax
** Stock up 417.9% from offer price of HK$165 apiece; YTD, benchmark Hang Seng Index .HSI up 3.9%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))