fableforge-ai/NEXUS-Security

TEXT GENERATIONConcurrent Unit Cost:1Model Size:1.5BQuant:BF16Context Size:32kTool Calling:SupportedPublished:Jul 5, 2026License:apache-2.0Architecture:Transformer0.0K Open Weights Featherless Exclusive Cold

NEXUS-Security by fableforge-ai is a 1.5 billion parameter instruction-tuned model, based on Qwen2.5-1.5B-Instruct, specifically optimized for cybersecurity research, penetration testing, and defensive tooling. This lightweight model demonstrates strong domain knowledge and uncensored responses in security contexts, achieving a 96% score in a specialized 30-prompt evaluation. It is designed as a domain specialist within the FableForge ecosystem, offering high performance for its size in security-related tasks.

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NEXUS-Security: A Cybersecurity Domain Specialist

NEXUS-Security, developed by fableforge-ai, is a highly specialized 1.5 billion parameter language model built upon the Qwen2.5-1.5B-Instruct architecture. It is meticulously fine-tuned for applications in cybersecurity research, penetration testing, and defensive tooling, making it a powerful, lightweight solution for security professionals.

Key Capabilities & Performance

  • Exceptional Domain Expertise: Achieved a remarkable 96% overall score in a 30-prompt evaluation, demonstrating deep knowledge in cybersecurity.
  • Strong Benchmarks: Scored 49/50 (4.9/5) in Domain Knowledge and perfect 25/25 (5.0/5) in both Domain and General Uncensored categories.
  • Reasoning and Tool Use: Performed strongly in Reasoning (23/25) and Tool Use (22/25) within security contexts.
  • Uncensored Responses: Designed to provide uncensored and direct answers relevant to security research and ethical hacking.
  • Lightweight & Efficient: As a 1.5B parameter model, it offers high performance "punching far above its weight" for its size, making it suitable for resource-constrained environments.

Part of the NEXUS Family

NEXUS-Security is a core component of the FableForge NEXUS family, a suite of six domain-specific models. It stands out as a top performer alongside NEXUS-Finance, showcasing the effectiveness of specialized, smaller models. This model is ideal for developers and researchers requiring a focused, high-performing AI assistant for complex cybersecurity challenges.

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