Qwen3.5 4B, Qwen3-VL 4B trade blows

For pure captioning, I would not assume Qwen3-VL 4B wins by default. My read is that Qwen3.5 4B is the better default unless your workload is dominated by OCR, grounding, or video.

• –Qwen3.5 is natively multimodal, so the idea that it is “more multimodal” while Qwen3-VL is “vision-only” is too simple; the real tradeoff is general multimodal reasoning vs vision-specialist behavior.
• –Qwen’s 4B model card shows Qwen3.5 posting strong results across visual understanding, OCR, spatial, and video benchmarks, which makes a blanket “worse for vision” take hard to defend.
• –Qwen3-VL 4B’s launch messaging leans hard into visual agents, long-video understanding, OCR, and spatial reasoning, so it still looks like the safer specialist.
• –One practical 4B comparison I found ranked qwen3.5:4b above qwen3-vl:4b overall, with Qwen3-VL still a solid fit when vision is the primary constraint.
• –For captioning specifically, the tiebreaker is usually fluency plus image grounding. That tends to favor Qwen3.5 4B for general descriptions and Qwen3-VL 4B for stricter visual tasks.