Pith Number

pith:RTQGP7BP

pith:2026:RTQGP7BP4LMGQEVOYJLLX5NVJT

not attested not anchored not stored refs pending

MemBuilder: Reinforcing LLMs for Long-Term Memory Construction via Attributed Dense Rewards

Fuming Lai, Shaobing Lian, Yanghui Rao, Zhiyu Shen, Ziming Wu

MemBuilder trains a 4B model with dense rewards to outperform closed-source LLMs on long-term dialogue memory.

arxiv:2601.05488 v4 · 2026-01-09 · cs.CL

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\pithnumber{RTQGP7BP4LMGQEVOYJLLX5NVJT}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Experimental results show that MemBuilder enables a 4B-parameter model to outperform state-of-the-art closed-source baselines, exhibiting strong generalization across long-term dialogue benchmarks.

C2weakest assumption

That synthetic session-level question generation produces unbiased, representative dense rewards that accurately measure and improve real-world memory construction quality without introducing artifacts.

C3one line summary

MemBuilder trains 4B-parameter models with attributed dense rewards to outperform closed-source baselines on long-term dialogue memory tasks.

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-06-23T02:13:19.896189Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8ce067fc2fe2d86812aec256bbf5b54ceb75bb201f921243cb2addeb7842f823

Aliases

arxiv: 2601.05488 · arxiv_version: 2601.05488v4 · doi: 10.48550/arxiv.2601.05488 · pith_short_12: RTQGP7BP4LMG · pith_short_16: RTQGP7BP4LMGQEVO · pith_short_8: RTQGP7BP

Agent API

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/RTQGP7BP4LMGQEVOYJLLX5NVJT \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 8ce067fc2fe2d86812aec256bbf5b54ceb75bb201f921243cb2addeb7842f823

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e5a186dec8385e48b46cebc9616f85230615985ba34d607dc23fbbfe0d0e4a56",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2026-01-09T02:44:37Z",
    "title_canon_sha256": "c178304caa6aaa1b902a468ea4ee41cc68c2669cb31e2b34459160bab673c3cb"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2601.05488",
    "kind": "arxiv",
    "version": 4
  }
}