Models other than hy3-free / deepseek flash free fail with Forbidden: {model:big-pickle} #43054

Description

When using opencode with any model other than hy3-free and deepseek flash free, requests fail with a Forbidden error whose body references the model big-pickle:

Forbidden: {"model":"big-pickle"}

Only hy3-free and deepseek flash free are usable. Every other model selection results in this error.

Steps to reproduce

1. Set the active model to anything other than hy3-free or deepseek flash free (e.g. a model that internally resolves to / is routed as big-pickle).
2. Send any prompt / start a session.
3. Observe the Forbidden: {"model":"big-pickle"} response.

Expected behavior

• The selected model is accepted and the request completes, OR
• a clear, descriptive error explains which models are permitted.

Actual behavior

• The request is rejected with Forbidden: {"model":"big-pickle"}.
• Only hy3-free and deepseek flash free work.

Notes

• The rejected model id big-pickle appears to be a backend model name that is not authorized for the account/endpoint.
• This looks like a model-access / entitlement issue: the backend only allows hy3-free and deepseek flash free, while other models (including ones that map to big-pickle) are blocked with a bare Forbidden and no detail.
• A clearer error message (which models are allowed, or why this one is forbidden) would make the failure actionable instead of cryptic.

Environment

• opencode
• Working models: hy3-free, deepseek flash free
• Failing models: everything else (backend returns {"model":"big-pickle"})