Qwen3-4B is a 4 billion parameter causal language model developed by Qwen, part of the latest Qwen3 series. This model uniquely supports seamless switching between a 'thinking mode' for complex logical reasoning, math, and coding, and a 'non-thinking mode' for efficient general-purpose dialogue. It features enhanced reasoning capabilities, superior human preference alignment for creative writing and multi-turn dialogues, and strong multilingual support across 100+ languages, with a native context length of 32,768 tokens extendable to 131,072 tokens via YaRN.
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