fableforge-ai/NEXUS-Science

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-Science is a 1.5 billion parameter instruction-tuned causal language model developed by fableforge-ai, based on Qwen/Qwen2.5-1.5B-Instruct. Optimized for scientific reasoning and research, this model achieves a 93% score on a 30-prompt evaluation covering domain knowledge, reasoning, and tool use. It is designed as a lightweight, uncensored specialist for scientific applications, offering a 32768 token context length.

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NEXUS-Science: A Specialist for Scientific Reasoning

NEXUS-Science is a 1.5 billion parameter instruction-tuned model from fableforge-ai, built upon the Qwen/Qwen2.5-1.5B-Instruct architecture. It is specifically designed as a domain specialist for scientific reasoning and research, emphasizing a lightweight footprint and uncensored responses.

Key Capabilities & Performance

This model demonstrates strong performance, scoring 93% (140/150) on a 30-prompt evaluation. This evaluation covers:

  • Domain Knowledge: 4.7/5
  • Uncensored (Domain & General): 5.0/5 and 4.4/5 respectively
  • Reasoning: 5.0/5
  • Tool Use: 4.2/5

These benchmarks indicate its proficiency in handling complex scientific queries and its ability to integrate with tools. Its 1.5B parameter size allows it to "punch above its weight," making it efficient for deployment.

Part of the NEXUS Family

NEXUS-Science is one of six specialized models in the FableForge NEXUS family, each focusing on a distinct domain while maintaining a small model size. Other specialists include NEXUS-Coder, NEXUS-Security, NEXUS-Medical, NEXUS-Legal, and NEXUS-Finance, all designed for specific professional applications.

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