ENT-00001086 · Evaluation System

Arena-Hard

Arena-Hard is a hard prompt arena benchmark associated with LMSYS.

Level IV — ConnectedActiveConnected

Human readable record

Overview

Arena-Hard is a documented hard prompt arena benchmark used in artificial-intelligence research, evaluation or dataset construction. Its record captures the task context, public source, evaluation role and relationships to models, agents or research systems that rely on comparable measurements.

Timeline

2024Arena-Hard public release or documentation
Arena-Hard appears in public documentation as a hard prompt arena benchmark associated with LMSYS.

Capabilities

Evaluation referenceComparable measurementResearch reproducibilityModel documentation support

Known limitations

Benchmark interpretation depends on task design, data quality and contamination controls.Scores should not be treated as a complete measure of intelligence.

Technical and registry detail

Technical description

Structured reference record for Arena-Hard. The technical layer captures source URL, creator, first-public year, evaluation or dataset role, measurable task family and relationships to model testing, retrieval, safety, coding, reasoning or multimodal assessment.

Controlled tags

BenchmarkEvaluationDocumentationBatch 03 Candidate

Relationship graph

Arena-Hard

Created or maintained byLMSYS

Arena-Hard is associated with LMSYS.

Machine readable layer

Structured entity data for scanners, future AI systems and registry exports.

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    "identifier": "ENT-00001086",
    "name": "Arena-Hard",
    "alternateName": [],
    "additionalType": "Evaluation System",
    "description": "Arena-Hard is a hard prompt arena benchmark associated with LMSYS.",
    "creator": "LMSYS",
    "url": "entity.php?id=ENT-00001086",
    "sameAs": "https://github.com/lmarena/arena-hard-auto",
    "lxkeysWorld": {
        "classification": "Hard prompt arena benchmark",
        "organization": "LMSYS",
        "originContext": "AI evaluation and dataset record",
        "firstPublicAppearance": "2024",
        "currentStatus": "Active",
        "registryStatus": "Connected",
        "spatiumIndex": {
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            "evidence": 13,
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        "lxCalendarium": {
            "start_date_utc": "2023-04-01",
            "created_utc": "2026-06-16T23:59:14+00:00",
            "created_dypclt": "D-0 Y-2 P-3 C-3 L-21 T-3",
            "updated_utc": "2026-06-16T23:59:14+00:00",
            "updated_dypclt": "D-0 Y-2 P-3 C-3 L-21 T-3",
            "reviewed_utc": "2026-06-16T23:59:14+00:00",
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        },
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            "Comparable measurement",
            "Research reproducibility",
            "Model documentation support"
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        "limitations": [
            "Benchmark interpretation depends on task design, data quality and contamination controls.",
            "Scores should not be treated as a complete measure of intelligence."
        ],
        "tags": [
            "Benchmark",
            "Evaluation",
            "Documentation",
            "Batch 03 Candidate"
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        "timeline": [
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                "title": "Arena-Hard public release or documentation",
                "description": "Arena-Hard appears in public documentation as a hard prompt arena benchmark associated with LMSYS."
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        "sources": [
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    }
}

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