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LongRM: Revealing and Unlocking the Context Boundary of Reward Modeling

How AI Learned to Remember the Whole Story

Ever wondered why a chatbot sometimes forgets what you told it minutes ago? Scientists have discovered a new way to teach large language models to keep track of long conversations, just like a good listener remembers the whole plot of a movie.
They built a test called Long‑RewardBench that checks whether an AI’s answers stay true to the full context, not just the last sentence.
Think of it as a quiz where the AI must answer questions based on an entire chapter instead of a single paragraph.
The team found that even the most advanced “reward models” stumble when the story gets long, but their new multi‑stage training recipe creates a LongRM that stays on point.
Remarkably, an 8‑billion‑parameter LongRM beats much larger rivals and rivals a top‑secret Gemini model.
This breakthrough means future chatbots, virtual assistants, and AI agents will be more reliable, keeping conversations coherent from start to finish—making our digital talks feel more natural and trustworthy.
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LongRM: Revealing and Unlocking the Context Boundary of Reward Modeling

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