Harness Matters: GPT-5.6 Hits SoTA on ARC-AGI-3 with Two Setting Tweaks
TheZachMueller · x · 2026-07-30
A developer emphasized the critical impact of the testing harness on model experience and final results.
- Breakthrough: With just two setting changes, GPT-5.6 Sol actually achieved State-of-the-Art (SoTA) performance on the ARC-AGI-3 benchmark.
- Technical Details: The key was allowing the model to reason and work across multiple context windows using a canonical compaction implementation.
Related event: Optimized Memory Settings Triple GPT-5.6's Score on ARC-AGI-3(27 posts)→
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