# Opus 5.5 is probably still nerfed

> Source: <https://micjm.com/blog/opus-5.5-after-fable/>
> Published: 2026-11-13 18:00:00+00:00

# Opus 5.5 is probably still nerfed

A few days ago, [I wrote about Opus 5.5 being nerfed](https://micjm.com/blog/get-ready-for-fewer-opus-5.5-em-dashes/). One theory was that this was because of testing Fable 5.2, so I wanted to check again, since [Fable has now launched](https://www.anthropic.com/claude-fable-and-mythos-5-2).

Here’s a chart of Opus 5.5’s reported reasoning tokens per request, relative to alternative models in the same battles. The vertical line is the Fable release date, November 9:

From our data alone, we can only say that it’s likely that Opus is still nerfed. The p-val on the bootstrap test of before and after the Fable launch is p=0.105.