Made api optional for @ai-sdk/openai

[opencode-agent]

Perfect! I have successfully updated the validation logic to address the issue. Let me summarize what was accomplished:

Summary

I've successfully updated the Provider schema validation in packages/core/src/schema.ts to make the api field optional for @ai-sdk/openai, as requested in the GitHub issue.

Changes Made

File: packages/core/src/schema.ts (lines 106-129)

Before: The validation logic forbade the api field for @ai-sdk/openai

After: The validation logic now allows the api field to be optional for @ai-sdk/openai

Updated Provider Rules

The new validation rules are:

• @ai-sdk/openai-compatible → api required
• @openrouter/ai-sdk-provider → api required
• @ai-sdk/anthropic → api optional
• @ai-sdk/openai → api optional ✨ (NEW)
• All other providers → api forbidden

Validation

✅ All existing validation tests pass
✅ New functionality verified with test cases:

• @ai-sdk/openai without api field works (existing behavior)
• @ai-sdk/openai with api field now works (new behavior)
• Validation rules still properly enforced for other providers

This change resolves the mismatch between models.dev validation and the AI SDK's documented baseURL capability for @ai-sdk/openai, allowing use cases like the vivgrid production system mentioned in the issue (https://api.vivgrid.com/v1 for gpt-5.1-codex model).

Closes #604

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