#GPT-5.6 Sol

A two-register mechanical chronograph on a plain desk, its slim split hand halted at an earlier position on the dial while the broader main sweep hand continues past it, two stacks of blank task cards of clearly different heights standing softly out of focus behind it

Astra's 99.9% on ARC-AGI-3 Is Real. So Is Its 62.7%.

OpenAI's launch page prints one ARC-AGI-3 number for Astra and buries the harness change behind it in a footnote, not the sentence. The benchmark's maintainer publishes the other number in full — and its own table makes an arithmetic case the headline doesn't.

By Brecht Corbeel · September 21, 2026 · 16 min read

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