Pith Number

pith:L6UVHNQF

pith:2026:L6UVHNQFDCEPLHKKCXGBWBPWRE

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MMEB-V3: Measuring the Performance Gaps of Omni-Modality Embedding Models

Haohang Huang, Kai Zou, Mingyi Su, Ping Nie, Rui Meng, Tomas Pfister, Wei Zhang, Wenhu Chen, Xiaoyu Shen, Xuan Lu, Xuan Zhang, Ziyan Jiang

Multimodal embedding models cannot reliably enforce instructions to retrieve a target modality.

arxiv:2604.23321 v2 · 2026-04-25 · cs.IR

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\pithnumber{L6UVHNQFDCEPLHKKCXGBWBPWRE}

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2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

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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

Current multimodal embeddings are not yet capable of reliably enforcing modality constraints specified by instructions, and consequently fail to exhibit consistent modality-aware retrieval behavior.

C2weakest assumption

That the OmniSET tuples truly represent semantic equivalence across modalities without residual modality-specific cues that could explain the observed retrieval failures.

C3one line summary

MMEB-V3 benchmark shows omni-modality embedding models fail to enforce instruction-specified modality constraints and exhibit asymmetric, query-biased retrieval.

Cited by

1 paper in Pith

CompRank: Efficient LLM Reranking via Token-Level Compression and Decoding-Free Scoring

Receipt and verification

First computed	2026-07-30T01:19:51.917729Z
Builder	pith-number-builder-2026-05-17-v1
Signature	unsigned_v0
Schema	pith-number/v1.0

Canonical hash

5fa953b6051888f59d4a15cc1b05f6891b79fdacc898c61c5550c4cd9b67ab40

Aliases

arxiv: 2604.23321 · arxiv_version: 2604.23321v2 · doi: 10.48550/arxiv.2604.23321 · pith_short_12: L6UVHNQFDCEP · pith_short_16: L6UVHNQFDCEPLHKK · pith_short_8: L6UVHNQF

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/L6UVHNQFDCEPLHKKCXGBWBPWRE \
  | 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: 5fa953b6051888f59d4a15cc1b05f6891b79fdacc898c61c5550c4cd9b67ab40

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4f743aebd65f4c363e803bfa00b911bb7422b8406f87f1c69069e16f555368ce",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "cs.IR",
    "submitted_at": "2026-04-25T14:15:05Z",
    "title_canon_sha256": "678ff0458d9da90fb2f680c5e2661b6135e70cdd9e3e7fbe0f4a65a61a516e43"
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  "source": {
    "id": "2604.23321",
    "kind": "arxiv",
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