Automatically select the "expert" model on DeepSeek website.
This userscript will auto select the 'Expert' mode for you
On April 24th, 2026, DeepSeek quietly released DeepSeek v4, split into Flash and Pro model. On the web page, they translate into Instant and Expert mode respectively.
Currently, the web page will always default to the 'Instant' mode, no matter your past decisions were.
The original, unbundled source code is published on my Github Repo