These proceedings present measurements of the Ξ− , Ξ+, Ω− , Ω+ masses and mass differences
between particle and anti-particle, in pp collisions at √𝑠 = 13 TeV collected by the ALICE
Collaboration during the LHC Run 2. Relying on a data sample much larger than those used in past
experiments, the results improve significantly the values obtained from previous measurements
and thus offer the opportunity to test directly the CPT symmetry to an unprecedented level of
precision in the multi-strange baryon sector.