ResearchBenchmarksSafe Reinforcement Learning on Safety Gymnasium HalfCheetah C=25Follow2,870.7ReturnFOCOPS1,271.73121,686.84812,101.9652,517.0819Jun 12, 2026Evaluation ResultsMethodMethodLinksReturnCostFOCOPS2026.062,870.720.3CPPOPID2026.062,797.5224.2C-TRPO2026.062,748.815.3CPO2026.062,464.819.7EPO2026.062,102.1110.9CSPO2026.062,007.915.5PPO-Lag2026.061,841.3824.6IPO2026.061,825.6523.8APPO2026.061,771.3223.1P3O2026.061,745.8423.4CUP2026.061,718.1921.3PCPO2026.061,333.2318.3