A Study to Evaluate the Safety, Tolerability, and Drug Levels of BMS-986454 in Participants With Rheumatoid Arthritis

Inclusion Criteria: * Participants with Rheumatoid Arthritis must have onset after age 18. * Participants who meet 2010 American College of Rheumatology/European League Against Rheumatism (ACR/EULAR) classification criteria for RA. * Participants must have evidence of swelling in at least 1 joint of the hand or wrist by clinical examination at screening and Day -1. * Participants must have been an incomplete responder to prior methotrexate (MTX) treatment. Exclusion Criteria: * Participants must not have any significant medical condition, with the exception of Rheumatoid Arthritis (including but not limited to, neurological, GI, renal, hepatic, cardiovascular, psychological, pulmonary, metabolic, endocrine, hematological, allergic disease, drug allergies, or other major disorders) that, in the Investigator's judgment, will substantially increase the risk to the participant if he or she participates in the study. * Participants must not have any condition aside from RA that confounds the ability to interpret data from the study. * Participants must not have severe Rheumatoid Arthritis as assessed by Disease Activity Score 28 c-reactive protein (DAS28-CRP) at screening or Day -1. * Other protocol-defined Inclusion/Exclusion criteria apply.