Grok 4.7 Takes the Top Spot on Artificial Analysis' Cyber Index

As seen on the 24/7 Wall St. homepage on October 4, 2026.

Elon Musk @elonmusk Quote post

xAI claiming the top cybersecurity ranking over Claude Opus 5.5 and ChatGPT 6 Astra gives Musk a concrete benchmark win to sell enterprise and defense buyers ahead of his next funding round.

Grok 4.7 is #1 on the AA Cyber Index https://t.co/skcnNrMBA1 [Quoted @XFreeze]: Grok 4.7 xHigh ranked #1 on Artificial Analysis’ Cyber Index Grok 4.7 is now very powerful with serious cybersecurity capabilities It outperformed Claude Opus 5.5, Fable 5.1, ChatGPT 6 Astra and other frontier models The Cyber Index combines three evaluations: • CWE-Bench-AA https://t.co/b8uN59b973
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Artificial Analysis' Cyber Index ranks frontier AI models on cybersecurity capability, and xAI's Grok 4.7 now sits at number one. The benchmark combines multiple evaluations, including CWE-Bench-AA, to stress-test how well models handle real security challenges.

The models it displaced are not minor entries. Grok 4.7 outperformed Claude Opus 5.5, Fable 5.1, and ChatGPT 6 Astra, which represent the current generation of frontier competition from Anthropic, and OpenAI respectively. Beating that field on a security-specific index is a different kind of claim than a general reasoning leaderboard.

Enterprise and defense buyers increasingly treat cybersecurity AI capability as a procurement requirement. A verifiable top ranking on a named third-party index gives xAI a concrete data point to put in front of those buyers.

Elon Musk amplified the result personally, quoting an X Freeze post that framed the win in detail. The original post drew over 455,000 impressions, suggesting the benchmark result is landing with an audience well beyond AI researchers.