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Excited to release Step-Jev 🔥 step-by-step rewards for agent RL, even when there’s no answer key After DeepSeek R1, everyone said step rewards get hacked, so just reward the final answer. We found the opposite. With an AI judge grading only the final answer, our agent learned to fool it and accuracy dropped every single update until it was worse than no training at all. Step rewards fixed it. Everything is open!