ENT-00000898 · Foundation Model

Hyena Hierarchy

Hyena Hierarchy is a documented foundation model associated with Stanford University.

Level V — PersistentActiveDocumented

Human readable record

Overview

Hyena Hierarchy is documented as a foundation model or model-family record associated with Stanford University. Its relevance comes from research model architecture for long-context sequence modeling. The entity is useful for tracing model lineage, provider strategy, capability evolution and relationships between assistants, APIs and downstream products.

Timeline

2023Hyena Hierarchy public reference
Hyena Hierarchy is publicly documented in relation to Stanford University.

Capabilities

Language or multimodal model capabilityAPI or deployment integrationReasoning, generation or representation learningModel-family relationship mapping

Known limitations

Capabilities vary by release, deployment setting and evaluation method.Operational details may differ across hosted APIs, open releases or downstream integrations.

Technical and registry detail

Technical description

Structured record for Hyena Hierarchy. The technical layer identifies entity type Foundation Model, organization Stanford University, source anchor https://hazyresearch.stanford.edu/blog/2023-03-07-hyena, capability fields, limitation fields, timeline event, source records, tags (Stanford University, Foundation Model, Documented AI) and graph relationships for machine-readable registry integration.

Controlled tags

Stanford UniversityFoundation ModelDocumented AIlong-context

Relationship graph

Hyena Hierarchy

Associated OrganizationStanford University

Stanford University is the organization or ecosystem associated with Hyena Hierarchy.

Creator or DeveloperStanford / Together AI researchers

Stanford / Together AI researchers is identified as a creator, developer or originating actor for Hyena Hierarchy.

Registry CategoryFoundation Models

Model-level entity connected to the foundation-model layer of the registry.

Machine readable layer

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

{
    "@context": "https://schema.org",
    "@type": "Thing",
    "identifier": "ENT-00000898",
    "name": "Hyena Hierarchy",
    "alternateName": [],
    "additionalType": "Foundation Model",
    "description": "Hyena Hierarchy is a documented foundation model associated with Stanford University.",
    "creator": "Stanford / Together AI researchers",
    "url": "entity.php?id=ENT-00000898",
    "sameAs": "https://hazyresearch.stanford.edu/blog/2023-03-07-hyena",
    "lxkeysWorld": {
        "classification": "long-context sequence model",
        "organization": "Stanford University",
        "originContext": "Research model",
        "firstPublicAppearance": "2023",
        "currentStatus": "Active",
        "registryStatus": "Documented",
        "spatiumIndex": {
            "total": 88,
            "documentation": 25,
            "evidence": 13,
            "structure": 25,
            "relationships": 25,
            "level": "Level V — Persistent"
        },
        "lxCalendarium": {
            "start_date_utc": "2023-04-01",
            "created_utc": "2026-06-16T23:59:02+00:00",
            "created_dypclt": "D-0 Y-2 P-3 C-3 L-21 T-3",
            "updated_utc": "2026-06-16T23:59:02+00:00",
            "updated_dypclt": "D-0 Y-2 P-3 C-3 L-21 T-3",
            "reviewed_utc": "2026-06-16T23:59:02+00:00",
            "reviewed_dypclt": "D-0 Y-2 P-3 C-3 L-21 T-3"
        },
        "capabilities": [
            "Language or multimodal model capability",
            "API or deployment integration",
            "Reasoning, generation or representation learning",
            "Model-family relationship mapping"
        ],
        "limitations": [
            "Capabilities vary by release, deployment setting and evaluation method.",
            "Operational details may differ across hosted APIs, open releases or downstream integrations."
        ],
        "tags": [
            "Stanford University",
            "Foundation Model",
            "Documented AI",
            "long-context"
        ],
        "timeline": [
            {
                "date": "2023",
                "title": "Hyena Hierarchy public reference",
                "description": "Hyena Hierarchy is publicly documented in relation to Stanford University."
            }
        ],
        "relationships": [
            {
                "target": "Stanford University",
                "type": "Associated Organization",
                "description": "Stanford University is the organization or ecosystem associated with Hyena Hierarchy.",
                "evidence_level": "documentary"
            },
            {
                "target": "Stanford / Together AI researchers",
                "type": "Creator or Developer",
                "description": "Stanford / Together AI researchers is identified as a creator, developer or originating actor for Hyena Hierarchy.",
                "evidence_level": "documentary"
            },
            {
                "target": "Foundation Models",
                "type": "Registry Category",
                "description": "Model-level entity connected to the foundation-model layer of the registry.",
                "evidence_level": "documentary"
            }
        ],
        "sources": [
            {
                "label": "Hyena Hierarchy official reference",
                "url": "https://hazyresearch.stanford.edu/blog/2023-03-07-hyena",
                "source_type": "Official Documentation",
                "verification_status": "verified"
            }
        ]
    }
}

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