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Gary Marcus tweeted that Claude Code is “the most neurosymbolic thing” he has…

2026-05-12 · 13:58 UTC ·@heathercmiller ·1 min read

Brief

Heather C. Miller amplifies Gary Marcus's claim that Claude Code, while "still not AGI," is a major neurosymbolic advance: it pairs a state‑of‑the‑art LLM with 53 symbolic tools and roughly 500,000 lines of symbolic code. She argues this vindicates integrating classical AI/CS into compound systems rather than relying on pure LLMs, and links to a ccunpacked.dev dissection.

Why it matters

Gary Marcus tweeted that Claude Code is “the most neurosymbolic thing” he has seen, describing it as “still not AGI” but the biggest advance since GPT‑4; he says it integrates 53 symbolic tools and about 500,000 lines of symbolic code with a state‑of‑the‑art LLM.

Key details

  • Heather C. Miller frames Marcus’s praise as evidence that recent progress is a victory for integrating classical AI and computer‑science techniques into compound/neurosymbolic systems (not for pure LLMs) and points to a technical dissection at ccunpacked.dev.
Source evidence

"It is categorically not a victory for pure LLMs; it’s a victory for borrowing from classical AI and CS to move beyond pure LLMs."

☝️ Compound AI Systems alllll the way downnn

Gary Marcus (@GaryMarcus)

🤩🤯🤩 Claude Code (still not AGI but biggest advance since GPT-4) is the most neurosymbolic thing I have ever seen in my life. 53 symbolic tools, 500,000 lines of symbolic code, combined with a state-of-the-art LLM.

It is categorically not a victory for pure LLMs; it’s a victory for borrowing from classical AI and CS to move beyond pure LLMs.

Its success is complete vindication for everything I have said since 2001.

Amazing dissection of how it works at ccunpacked.dev/

— https://nitter.net/GaryMarcus/status/2054015225318482075#m