Gateway model aliases cannot target explicit provider option namespaces

[codylandry]

Description

For @ai-sdk/gateway models, provider options other than gateway are bucketed under the model ID prefix. If that prefix is a routing alias rather than the upstream provider name, callers cannot set an explicit namespace such as openai.

Plugins

None

OpenCode version

1.18.29

Steps to reproduce

1. Configure a gateway model whose API ID is alias/example-model.
2. Set gateway routing options and an OpenAI-specific option.
3. Observe that the OpenAI option is emitted under providerOptions.alias instead of providerOptions.openai.

Operating System

macOS

Terminal

Terminal

[github-actions]

This issue might be a duplicate of an existing issue. Please check:

• bug: gateway providerOptions drops explicit provider namespace under an unrecognized model-ID alias #47987: Same root cause — gateway model alias prefix incorrectly buckets providerOptions instead of preserving explicit provider namespaces (e.g. openai). That issue also includes a linked PR with a fix and unit tests.

[codylandry]

Duplicate of #47987, which I opened with the correct linked-issue reference for PR #47985. Apologies for the duplicate — closing this one. Thanks for the assignment/comment; happy to continue the discussion on #47987 if preferred.