HTTP 400 error trying to use mimo-v2.5

Description

I have been using opencode go with Hermes with no problem. It was in the middle of a multiturn task using that model, when all of a sudden I got the below error. Since it was in the middle of a task, it is not like I changed the config or anything, so something very recently happened on the opencode go side to make this model no longer available.

── Hermes error details ──
time: 2026-08-28T18:01:55.153Z
layer: provider
code: unknown
retryable: true
provider: opencode-go
model: mimo-v2.5
error: HTTP 400: Error from provider (Console Go): Upstream request failed: [404] No allowed providers are available for the selected model. Providers serving xiaomi/mimo-v2.5-20260422: gmicloud, deepinfra, xiaomi, parasail, streamlake, novita, but your request's provider.only preference permits only: tencent.

Plugins

No response

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

No response

Operating System

No response

Terminal

No response

Start with the provider layer described in the Hermes error details and trace how the selected model and provider.only preference are sent to Console Go. Compare the allowed providers in the error with the requested preference; done means the issue's cause and a reproducible resolution are documented or the request no longer receives this 400 response.