Paid model fails with "Unexpected server error"

Description

Go subscription. Same API key works for deepseek-v4-flash on my PC
(desktop client) but on my server (same OpenCode 1.18.16, same key) it
returns:

"Unexpected server error" (ref: err_88f929e7)

Free model (deepseek-v4-flash-free) works fine on both.

OpenCode 1.18.16 · workspace wrk_01KZNC9A5SK5QFAWRKSQK5KG5M

Plugins

No response

OpenCode version

1.18.16

Steps to reproduce

1. Use OpenCode Go subscription, provider "opencode-go" with API key (type: api).
2. Run: opencode run --model opencode/deepseek-v4-flash "test"
3. Expected: model responds.
4. Actual: returns Unexpected server error (ref: err_88f929e7).

Note: The SAME key + SAME version on my desktop client runs
deepseek-v4-flash fine. Free model (deepseek-v4-flash-free) also works
fine on the server. Only paying models fail on the server.

Workspace: wrk_01KZNC9A5SK5QFAWRKSQK5KG5M

Screenshot and/or share link

No response

Operating System

Server (fails): Debian 12 (Linux x86_64) PC (works): Windows

Terminal

Server: ssh/bash (non-interactive opencode run) PC: OpenCode desktop client