Counterintuitive Finding: Visual Reasoning Relies on Tool-Call Text, Not Pixels
kwangmoo_yi · x · 2026-08-14
The paper "Thinking With Tools, Not With Pixels" presents a counterintuitive conclusion about how vision-language models "think."
- Core Finding: In tool-augmented vision models, skipping or removing returned image pixels doesn't significantly degrade performance (only a 0.52 pp drop on VBench) and can even improve performance on MathVista.
- Mechanism: The authors propose the "Tool-Call Scaffold Hypothesis." The structured text emitted when calling tools like crop or zoom (including tool name, coordinates, target description) already encodes the causal signal of where to look and what to find.
- Conclusion: Visual reasoning is actually driven by the textual scaffolding of the tool call, not the returned image pixels themselves.
Related event: Study Finds Tool-Based Text Beats Pixel Viewing in Visual Reasoning(2 posts)→
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