If the tool caches models, refresh after key changes.
Coding-agent tip
Prefer a stable default for day-to-day coding (for example gpt-5.5 when visible on your key), and only switch when you need longer context or a different capability.
If a model is missing
Confirm the channel is enabled for your group.
Confirm the model is registered in the gateway catalog.
Re-check with the same token on global and China hosts — identical short lists mean catalog/policy, not DNS.