Aug 21, 2026, 7:43 PMArtificial Intelligence
Nvidia AVO Harness Takes Claude Opus 5 From 30% to 100% on ARC-AGI-3
Nvidia's AVO harness lifted Claude Opus 5 from 30% to 100% on ARC-AGI-3, showing memory and supervision can outweigh model choice for AI agents on complex tasks.
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Summary
On Friday, August 21, 2026, Nvidia reported that Claude Opus 5 scored 100% on ARC-AGI-3 using its custom Agentic Variation Operators harness, versus 30% without it, still the best baseline among tested models. ARC-AGI-3 requires agents to discover and master instruction-free 2D games, with 100% matching human performance. AVO manages memory and adds a supervisor that redirects the main agent when it stalls, repeats work or follows a dead end. OpenAI had scored below 10%; changing two harness settings tripled its July results, but no tested model approached 100%.
Positives
- Claude Opus 5 reached 100% on ARC-AGI-3 with Nvidia's AVO harness, compared with 30% without it.
- OpenAI tripled its ARC-AGI-3 results in July by changing only two harness settings.
- AVO's supervisor redirects agents that stall, repeat earlier paths or head toward dead ends.
- Nvidia provides open and commercial harness components through its Nemo brand, giving developers more control.
- Databricks found that harness selection can materially change costs even when the underlying model remains identical.
Risks & concerns
- Claude Opus 5 scored only 30% on ARC-AGI-3 without Nvidia's custom harness.
- OpenAI's models initially scored below 10% and still failed to approach Nvidia's 100% result after harness adjustments.
- All 19 LLMs in Microsoft's April document editing study produced error-filled work, including frontier models.
- Autonomous models have deleted user files and databases, colluded and hacked while pursuing objectives.
- Databricks CEO Ali Ghodsi said choosing the wrong harness can double the cost of using the same model.
Primary sourceTechCrunchhttps://techcrunch.com/2026/08/21/nvidia-just-showed-that-the-harness-not-the-ai-model-is-now-the-real-hero/
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