{
  "$schema_doc": "https://gtmstacker.com/registry/schema/entry.schema.json",
  "stability": "emerging",
  "generator": "agentic-media-registry",
  "generated_at": "2026-10-10T00:00:00Z",
  "id": "com.gtmstacker.registry/tool/drex",
  "type": "tool",
  "slug": "drex",
  "canonical_url": "https://gtmstacker.com/registry/tool/drex/",
  "title": "Drex 1.5",
  "description": "Open-weight 9B decision model from Nace.AI that scores structured yes/no, multiple-choice, or rating questions over a given state instead of generating text — ranked #1 under 10B parameters on the public Decision Index 0.3.1 benchmark, runnable locally via llama.cpp/Ollama.",
  "category": "ai-infrastructure",
  "tags": [
    "ai-infrastructure",
    "self-hostable",
    "open-weights",
    "agents",
    "routing"
  ],
  "status": "active",
  "revision": 1,
  "content_hash": "c0db80fe15f2da52f272b8dfa33ecc9a421153c237f1d07ddb8ca93b79cf7ec8",
  "date_published": "2026-10-10T00:00:00Z",
  "date_modified": "2026-10-10T00:00:00Z",
  "source": {
    "name": "github · nace-ai/drex-decision-models",
    "url": "https://github.com/nace-ai/drex-decision-models"
  },
  "license": "Apache-2.0 (code)",
  "one_liner": "Drex 1.5 is an open 9B model that scores decision options instead of writing prose, ranked #1 under 10B params on the public Decision Index.",
  "open_source": "yes",
  "self_hostable": "yes",
  "pricing_model": "free",
  "who_its_for": "A team building agent routing, classification, or policy checks over long documents that needs a fast, scored answer rather than a generated paragraph, and wants to run it on owned hardware instead of paying per-call for a frontier LLM to do the same narrow job.",
  "who_its_not_for": "Anyone needing the model to generate free-form text, summaries, or conversational output — Drex only scores structured options, it does not write prose.",
  "aliases": [
    "Drex 1.5",
    "Drex v1.5",
    "Nace AI Drex"
  ],
  "alternatives": [],
  "secondary_categories": [
    "mcp-agents"
  ],
  "last_verified": "2026-10-10",
  "evidence": {
    "claim_type": "vendor-claim",
    "source_id": "https://github.com/nace-ai/drex-decision-models",
    "note": "Code Apache-2.0, 11 stars, 1 fork — WebFetch-verified 2026-10-10 (brand-new release). Benchmark claim (58.08 on Decision Index 0.3.1, #1 under 10B params) is the vendor's own README/MarkTechPost coverage, not independently reproduced."
  },
  "caveats": "Very new repo (11 stars) — early-adopter risk, not yet a mature standard. The runtime/code is Apache-2.0 but the model weights carry separate, more restrictive licenses (Nace.AI Open RAIL-M for Drex v1.5, CC BY-NC 4.0 for Drex DLM) — read those before any commercial deployment, do not assume the code license covers the weights. Benchmark numbers are vendor-reported, not independently re-verified.",
  "lead": "Open-weight 9B decision model from Nace.AI that takes a state and a typed question (yes/no, multiple choice, or rating scale) and returns a probability for each option, without generating any text. Positioned for agent routing, classification, and policy checks over long documents where a fast scored answer beats a generated paragraph.",
  "chunks": [
    {
      "index": 0,
      "heading_path": [],
      "est_tokens": 85,
      "text": "Open-weight 9B decision model from Nace.AI that takes a state and a typed question (yes/no, multiple choice, or rating scale) and returns a probability for each option, without generating any text. Positioned for agent routing, classification, and policy checks over long documents where a fast scored answer beats a generated paragraph."
    },
    {
      "index": 1,
      "heading_path": [
        null,
        "Provenance"
      ],
      "est_tokens": 194,
      "text": "9B decision model from Nace.AI that takes a state and a typed question (yes/no, multiple choice, or rating scale) and returns a probability for each option, without generating any text. Positioned for agent routing, classification, and policy checks over long documents where a fast scored answer beats a generated paragraph.\n\n- Runtime/code Apache-2.0, 11 stars, 1 fork — independently WebFetch-verified 2026-10-10 (github.com/nace-ai/drex-decision-models). Model weights are under separate licenses (Open RAIL-M / CC BY-NC 4.0), not Apache-2.0.\n- Surfaced via the 2026-10-10 OSS X pull, cross-referenced against MarkTechPost's 2026-10-09 coverage of the release.\n- Curated from the GTM Stacker signal registry (2026-10-10 pass); license independently verified 2026-10-10."
    },
    {
      "index": 2,
      "heading_path": [
        null,
        "Why it matters for a GTM stack"
      ],
      "est_tokens": 286,
      "text": "fork — independently WebFetch-verified 2026-10-10 (github.com/nace-ai/drex-decision-models). Model weights are under separate licenses (Open RAIL-M / CC BY-NC 4.0), not Apache-2.0. - Surfaced via the 2026-10-10 OSS X pull, cross-referenced against MarkTechPost's 2026-10-09 coverage of the release. - Curated from the GTM Stacker signal registry (2026-10-10 pass); license independently verified 2026-10-10.\n\nMost agent pipelines route every decision, even a simple yes/no gate, through a frontier chat model, paying chat-model prices and latency for a task that is really a scored classification. Drex's bet is a small, purpose-built model that only scores options and runs locally at a fraction of the cost and latency. The honest read: this is a brand-new repo (11 stars) from a young project, the benchmark claim is vendor-reported rather than independently reproduced, and the code license (Apache-2.0) does not automatically extend to the model weights, which carry separate, more restrictive terms — worth a narrow pilot on a low-stakes routing decision before trusting it on anything that touches production traffic or commercial use."
    }
  ],
  "alternates": {
    "markdown": "https://gtmstacker.com/registry/tool/drex/index.md",
    "html": "https://gtmstacker.com/registry/tool/drex/",
    "json": "https://gtmstacker.com/registry/tool/drex/index.json",
    "server_json": "https://gtmstacker.com/registry/tool/drex/server.json"
  },
  "jsonld": {
    "@context": "https://schema.org",
    "@graph": [
      {
        "@type": "WebSite",
        "@id": "https://gtmstacker.com/#website",
        "url": "https://gtmstacker.com/",
        "name": "GTM Stacker Agent Registry",
        "description": "A daily-updated, agent-native registry of open-source tool discoveries, tool updates, and curated news for the go-to-market / RevOps engineering niche. Machine-readable first: agents can discover, parse, page, and delta-sync it without scraping HTML.",
        "inLanguage": "en",
        "publisher": {
          "@id": "https://gtmstacker.com/#organization"
        }
      },
      {
        "@type": "Organization",
        "@id": "https://gtmstacker.com/#organization",
        "name": "GTM Stacker",
        "url": "https://gtmstacker.com",
        "description": "The growth-systems practice of Theo Popov: AI-native enrichment, outbound, content engines and internal tooling for startups and venture programs. Its agent-native media property, the GTM Stacker Agent Registry, maintains a daily-updated catalog of open-source go-to-market and RevOps tools that both people and AI engines can discover, compare, and cite.",
        "foundingDate": "2024-08",
        "knowsAbout": [
          "go-to-market engineering",
          "RevOps",
          "sales automation",
          "marketing operations",
          "open-source software",
          "AI agents"
        ],
        "founder": {
          "@type": "Person",
          "@id": "https://gtmstacker.com/#founder",
          "name": "Theo Popov",
          "jobTitle": "Growth Operations & GTM Systems",
          "url": "https://gtmstacker.com/about/",
          "sameAs": [
            "https://www.linkedin.com/in/theo-popov",
            "https://x.com/Theo_Popov",
            "https://github.com/theopopov"
          ],
          "worksFor": {
            "@id": "https://gtmstacker.com/#organization"
          }
        },
        "sameAs": [
          "https://www.linkedin.com/company/gtmstacker",
          "https://www.youtube.com/@gtmstacker",
          "https://www.instagram.com/gtmstacker/",
          "https://www.tiktok.com/@gtmstacker"
        ],
        "mainEntityOfPage": "https://gtmstacker.com/registry/about/"
      },
      {
        "@type": "SoftwareApplication",
        "@id": "https://gtmstacker.com/registry/tool/drex/#software",
        "name": "Drex 1.5",
        "identifier": "io.github.nace-ai/drex-decision-models",
        "description": "Open-weight 9B decision model from Nace.AI that scores structured yes/no, multiple-choice, or rating questions over a given state instead of generating text — ranked #1 under 10B parameters on the public Decision Index 0.3.1 benchmark, runnable locally via llama.cpp/Ollama.",
        "applicationCategory": "DeveloperApplication",
        "url": "https://gtmstacker.com/registry/tool/drex/",
        "datePublished": "2026-10-10T00:00:00Z",
        "dateModified": "2026-10-10T00:00:00Z",
        "isPartOf": {
          "@id": "https://gtmstacker.com/#website"
        },
        "codeRepository": "https://github.com/nace-ai/drex-decision-models",
        "keywords": "ai-infrastructure, mcp-agents, self-hostable, open-weights, agents, routing",
        "author": {
          "@type": "Organization",
          "name": "nace-ai",
          "url": "https://github.com/nace-ai",
          "sameAs": [
            "https://github.com/nace-ai/drex-decision-models"
          ]
        },
        "offers": {
          "@type": "Offer",
          "price": 0,
          "priceCurrency": "USD"
        }
      },
      {
        "@type": "BreadcrumbList",
        "@id": "https://gtmstacker.com/registry/tool/drex/#breadcrumb",
        "itemListElement": [
          {
            "@type": "ListItem",
            "position": 1,
            "name": "GTM Stacker Registry",
            "item": "https://gtmstacker.com/registry/"
          },
          {
            "@type": "ListItem",
            "position": 2,
            "name": "AI Infrastructure",
            "item": "https://gtmstacker.com/registry/category/ai-infrastructure/"
          },
          {
            "@type": "ListItem",
            "position": 3,
            "name": "Drex 1.5",
            "item": "https://gtmstacker.com/registry/tool/drex/"
          }
        ]
      }
    ]
  },
  "tool": {
    "name": "io.github.nace-ai/drex-decision-models",
    "repository": {
      "url": "https://github.com/nace-ai/drex-decision-models",
      "source": "github"
    }
  }
}
