Gary Marcus on GPT-6 Astra: symbolic world models are vindication, but no proof of AGI
GaryMarcus · x · 2026-09-04
Gary Marcus published a take on OpenAI's rumored GPT-6 Astra, challenging Greg Brockman's AGI claims:
- Multiple reports suggest a genuine, impressive advance.
- After nearly a decade of campaigning for (neuro)symbolic world models, he finds it "extraordinarily vindicating" that an OpenAI product explicitly creates and manipulates symbolic world models during computation.
- The key open question is how robust that capability actually is.
- Success on ARC-AGI is impressive but not proof of AGI despite the benchmark's name; he expects many failures to surface.
The retweeter adds that, as a scientist, it's disappointing how little we still know about how the system actually works.
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