In Brazil, CA-50 rebar, with a minimum characteristic yield strength of 500 MPa, is the most commonly used steel for reinforced concrete structures. In North America, Grade 60 steel, with a minimum characteristic yield strength of 60 ksi (equivalent to 413 MPa), is widely applied. However, technological advancements and research investments have led to the emergence of higher-strength steels for use in concrete reinforcement. The introduction of CA-70 steel, with a minimum characteristic yield strength of 700 MPa, signifies progress in this modernization process, indicating an industry more focused on high-performance materials. The general objective of this study is to determine the flexural behavior and serviceability of beams made of steel fiber reinforced concrete (SFRC) reinforced with high-strength steel. Specific objectives include experimentally evaluating the impact of changes in the detailing of high-strength steel longitudinal reinforcements on crack openings under service conditions, assessing the contribution of steel fibers in beams reinforced with high-strength steel longitudinal reinforcements and without transverse reinforcement on crack openings under service conditions, and numerically evaluating the effect of fiber content on flexural behavior, focusing on crack openings, of concrete beams reinforced with high-strength steel longitudinal reinforcements. This study comprises experimental and numerical investigations. Experimental testing involves material characterization, including compressive strength determination of conventional and fiber-reinforced concrete, modulus of elasticity determination, and post-cracking behavior of fiber-reinforced concrete. Steel rebar types will undergo direct tensile tests to obtain stress-strain curves, modulus of elasticity, yield stress, ultimate stress, and corresponding strains. Flexural testing will be conducted on beams with various reinforcement arrangements, followed by numerical modeling using Abaqus software to simulate the behavior of tested beams and extrapolate results for other configurations. Expected outcomes include a better understanding of the flexural behavior of SFRC beams reinforced with high-strength steel, insights into the influence of reinforcement detailing and fiber content on crack openings, and validation of numerical models using experimental data. Additionally, the study aims to provide insights into the potential synergistic effects of using high-strength steel and steel fiber reinforcement to achieve structures with reduced reinforcement density and controlled crack openings, contributing to advancements in structural engineering practices.