It entirely depends on the personality of the betta. I believe that most don't do well with tank mates, this comes from my personal experience. Others have had them eat antenna off of snails and consume their shrimp. I have heard others say that they do well with corys. Each case is unique.
75: blood parrots, featherfin cat, emperor tetras, turquoise rainbowfish, BN plecos, japanese trapdoor; 46: WCMM, gold inca snails, ghost, bamboo & amano shrimp, kuhli loaches, rummynose & ember tetras, endlers, platies, flame gourami, guppies; 16: pygmy, peppered, loxozonus corys, otos, assassins, RCS ... ~ Research PRIOR to purchase.... ~