As of: 2026-11-13 13:49 CET.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/p/x-elonmusk-2120099798078656909/

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

Elon Musk (@elonmusk), X, 2026-11-10.
Source: https://x.com/elonmusk/status/2120099798078656909

## 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.

Archived 2026-11-12 via fxtwitter (unofficial).
Counts: 2,095,045 views, 12,947 likes, 716 reposts, 501 replies (at fetch time)

## Cited in

- 2026-11-10: [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++](https://postcutoff.com/e/2026-11-10-musk-opus-5-5-masterpiece-grok-4-8/)
- Coming up: [xAI expected to release Grok 4.8](https://postcutoff.com/upcoming/#2026-10-01-grok-4-8-release)