Upstream request failed: [404] No allowed providers available for selected model despite provider.only whitelist

Description

Summary

When using a model via Console (Models.dev), opencode fails with a 404 'No allowed providers are available for the selected model' error. Even though the selected model IS among the served providers, the provider.only preference whitelists a provider that does not actually serve the model, so every request fails.

Error

Error from provider (Console): 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.

[retrying in 4s attempt #3] Retry Error

Expected behavior

opencode should either (a) fall back to one of the providers that actually serves the selected model, or (b) surface a clearer, actionable error instead of retrying the request 3+ times with a 404. The current behavior hides the root cause (an incompatible provider.only preference vs. the model's actual providers) behind a generic retry loop.

Plugins

No response

OpenCode version

No response

Steps to reproduce

1. Select model xiaomi/mimo-v2.5-20260422 (served by gmicloud, deepinfra, xiaomi, parasail, streamlake, novita).
2. Set a provider.only preference that whitelists only 'tencent' (a provider that does NOT serve this model).
3. Send a message.
4. Observe repeated 404 errors with retry loop: '[retrying in 4s attempt #3]'.

Screenshot and/or share link

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Operating System

Windows 11

Terminal

Windows Terminal