hamishivi/Qwen3.5-4B

VISIONConcurrency Cost:1Model Size:4.5BQuant:BF16Ctx Length:32kTool Calling:SupportedPublished:May 14, 2026License:apache-2.0Architecture:Transformer Open Weights Cold

Qwen3.5-4B is a 4.5 billion parameter causal language model developed by Qwen, featuring a unified vision-language foundation and an efficient hybrid architecture. It integrates multimodal learning and architectural efficiency, excelling in reasoning, coding, agent tasks, and visual understanding. The model supports a native context length of 262,144 tokens, extensible up to 1,010,000 tokens, and offers expanded global linguistic coverage across 201 languages and dialects.

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Qwen3.5-4B: A Multimodal Agent Foundation Model

Qwen3.5-4B is a 4.5 billion parameter multimodal large language model from the Qwen family, designed for exceptional utility and performance. It features a unified vision-language foundation that achieves strong performance across reasoning, coding, agent tasks, and visual understanding benchmarks, even outperforming previous Qwen3-VL models. The model incorporates an efficient hybrid architecture utilizing Gated Delta Networks and sparse Mixture-of-Experts for high-throughput inference with minimal latency.

Key Capabilities

  • Multimodal Learning: Early fusion training on multimodal tokens enables robust visual understanding and reasoning.
  • Extended Context Window: Natively supports 262,144 tokens, extensible up to 1,010,000 tokens using techniques like YaRN, making it suitable for ultra-long text processing.
  • Scalable RL Generalization: Enhanced real-world adaptability through reinforcement learning scaled across million-agent environments.
  • Global Linguistic Coverage: Supports 201 languages and dialects for inclusive worldwide deployment.
  • Agentic Functionality: Excels in tool calling, with recommended integration via Qwen-Agent and Qwen Code for terminal-based AI agent applications.

Good For

  • Applications requiring multimodal understanding (image and video input).
  • Tasks demanding long-context processing and complex reasoning.
  • Developing AI agents that interact with tools and environments.
  • Global applications needing broad language support.