ResearchResearch paperMultimodal Models · Agents & Tool Use · Reasoning & Planning2 sources · Oct 19, 2026

OpenVLHarness: Real World Visual Agentic Tool-Use with Multimodal Memory

Multimodal large language models (MLLMs) have made rapid progress on visual reasoning, yet many tasks require evidence that is difficult to obtain through internal reasoning alone: our controlled study on 22 benchmarks shows that simply increasing the inference budget of the base model yields only modest gains.

Key points

  • We introduce OpenVLHarness, a multimodal reasoning harness organized around a capability layer and persistent multimodal memory.
  • The capability layer combines task-level tool interfaces with evidence rendering, providing consistent access to heterogeneous backends and converting their outputs into model-readable observations.
  • Persistent multimodal memory retains the corresponding images, structured data, and web references as addressable artifacts throughout each query.
  • With GPT-6 Luna at medium reasoning effort, OpenVLHarness outperforms the base model, Codex, and Visual Sketchpad at maximum effort by 7.7-8.5 points while incurring at most 37% of their model-token cost.

Sources (2)

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Before this

  1. Oct 18, 2026Google Open-Sources Harness2, a Recursive Agent Harnessing Framework
  2. Oct 17, 2026deepseek-ai/DeepSeek-V4.1-Flash-1017
  3. Oct 16, 2026VERAS: Verification-Guided Adaptive Search for Reliable Operations Research
  4. Oct 16, 2026HexaShell: A Thin Harness for Exploring the Limits of VLM Agents as Robot Coding Agents
  5. Oct 16, 2026Welcome Beam: a 501B open model you can own, customize, and scale
  6. Oct 15, 2026Spatial Memory by Agents, for Agents

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