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qwen3-4b-reasoning is a 4B-parameter Qwen3-based reasoning “backfill” fine-tune (joeyzero/Qwen3-4B-Reasoning-Backfill-v0.1) converted to GGUF for llama.cpp/Ollama, with ~40K context and published as Q4_K_M (recommended) and iq4_xs (smaller).