OpenCode Zen requests take ~5 minutes and sometimes throw UnsupportedContentType (Desktop v1.14.29, Windows)

Description

opencode zen has become extremely slow on my machine. it worked normally for months, but starting around july 24, every request hangs on "thinking" for several minutes before eventually completing. even a simple prompt like "hello" takes around 5 minutes to respond. i also see the clienterror: unsupportedcontenttype error in the devtools console.

i'm using opencode desktop v1.14.29 on windows with opencode zen, and the issue affects all zen models. i've already updated opencode, generated a new api key, reset my opencode configuration, disabled my agents.md file, and tested on a different network using a phone hotspot, but nothing has changed.

if there are any logs or additional information i can provide, i'd be happy to help troubleshoot the issue.

Plugins

Graphify

OpenCode version

Desktop v1.14.29

Steps to reproduce

open opencode desktop, select any opencode zen model, and send a simple prompt such as "hello." the request hangs on "thinking" for several minutes before eventually completing. this happens consistently across all zen models.

Screenshot and/or share link

No response

Operating System

Windows 11

Terminal

Desktop app