RENDER: Controlling Reader-Facing Evidence in LLM Memory Evaluation

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[Submitted on 5 Jun 2026]

Title:RENDER: Controlling Reader-Facing Evidence in LLM Memory Evaluation

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Abstract:Memory and RAG evaluations often treat the answering model's input as an implementation detail, even though systems may render the same history as a memory entry, summary, typed record, or raw excerpt. We introduce RENDER, a benchmark control that fixes the conversation while varying the reader-facing artifact. RENDER combines a five-level packet ladder, localizing when answer-bearing content enters the input, with deterministic templates approximating ChatGPT-style entries, LangChain summaries, MemGPT-style typed records, and raw conversation. On 500 LongMemEval questions and nine models, matched-budget resolved packets beat recency-truncated raw dialogue by 42.4-72.6 points. In deployed-style templates, best-worst spread is 24.6-48.8 points per model; under the primary scorer, ChatGPT-style entries have higher point estimates than raw conversation on 7 of 9 models. Judge rescoring preserves the positive aggregate effect, but model-specific significance is mixed. Three models scoring 0 percent on formal ledger packets answer the same facts from natural-language entries at 45.4-53.4 percent. The effect persists under retrieval noise and transfers to HotpotQA, suggesting that memory/RAG evaluations should report or control the reader-facing artifact.

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Artificial Intelligence (cs.AI)

Cite as: arXiv:2608.23568 [cs.AI]

(or arXiv:2608.23568v1 [cs.AI] for this version)

https://doi.org/10.48550/arXiv.2608.23568

arXiv-issued DOI via DataCite

Submission history

From: Yuan Si [view email] [v1] Fri, 5 Jun 2026 07:45:12 UTC (393 KB)

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