---
title: 'Claude Mythos 5 redesigns quantum circuits, cutting gate counts up to 17x'
url: 'https://securteksecurity.com/news/claude-mythos-5-quantum-circuits-gate-counts-17x'
markdown: 'https://securteksecurity.com/news/claude-mythos-5-quantum-circuits-gate-counts-17x.md'
date: '2026-10-16'
description: 'Anthropic reports that Claude Mythos 5, working in a generator and judge loop with formal verification in Lean, redesigned eight quantum circuit tasks from plain-language specifications. Seven of the eight reduced both Toffoli gate counts and qubit counts against the best published designs. The eig…'
taxonomy:
  category:
    - AI
---

# [Claude Mythos 5 redesigns quantum circuits, cutting gate counts up to 17x](https://securteksecurity.com/news/claude-mythos-5-quantum-circuits-gate-counts-17x)

   16th Oct 2026  

Anthropic reports that Claude Mythos 5, working in a generator and judge loop with formal verification in Lean, redesigned eight quantum circuit tasks from plain-language specifications. Seven of the eight reduced both Toffoli gate counts and qubit counts against the best published designs. The eighth, an elliptic-curve point-addition circuit, used about 12 percent more qubits (935 against 838) for roughly 17 times fewer gates (4 million against 70 million), in a single 53-hour run.

Sourcing note: these results rest on Anthropic's own research announcement and outlets reporting it. They are circuit resource estimates, not runs on quantum hardware, and independent replication is not yet available.

Sources: [TokenPost](https://www.tokenpost.com/news/technology/33768); [CryptoBriefing](https://cryptobriefing.com/anthropic-claude-designs-quantum-circuits/)

---

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