“Not as good. Opus 5.5 is a masterpiece.”

Elon Musk @elonmusk10 November 2026X

Archived text

@Dimdv99 @tetsuoai Not as good. Opus 5.5 is a masterpiece.

But Grok 5 should exceed Opus 5.5 and maybe that happens in 2 or 3 months, with continued acceleration thereafter.

Source: x.com/elonmusk/status/2120099798078656909Archived 2026-11-12 via fxtwitter (unofficial).Counts: 2,095,045 views, 12,947 likes, 716 reposts, 501 replies (at fetch time)

Cited in

Model releases 10 Nov 133 days after the cutoff

Musk says Grok 4.8 is ‘not as good’ as Claude Opus 5.5, ‘a masterpiece’, and that xAI rewrote its RL and inference stack in C/C++

Coming upxAI expected to release Grok 4.8

Archived text

Cited in

Musk says Grok 4.8 is ‘not as good’ as Claude Opus 5.5, ‘a masterpiece’, and that xAI rewrote its RL and inference stack in C/C++