fix(core): send catalog models to a configured provider baseURL

packages/core/src/config/plugin/provider.ts

@@ -58,12 +58,14 @@ export const Plugin = define({
         const current = providers.get(providerID)
         const source = providers.get(item.canonical ?? current?.provider.canonical ?? providerID)
         const changed = item.canonical !== undefined && item.canonical !== current?.provider.canonical
+        let catalogBaseURL: string | undefined
         providers.update(providerID, (provider) => {
           if (changed && source && source.provider !== provider)
             Object.assign(provider, structuredClone(source.provider), {
               id: provider.id,
               integrationID: provider.integrationID,
             })
+          catalogBaseURL = provider.settings?.baseURL
           provider.activation = "enabled"
           if (item.canonical !== undefined) provider.canonical = item.canonical
           if (item.name) provider.name = item.name
@@ -74,6 +76,14 @@ export const Plugin = define({
           if (item.headers !== undefined) provider.headers = Provider.mergeHeaders(provider.headers, item.headers)
           if (item.body !== undefined) provider.body = Provider.mergeOverlay(provider.body, item.body)
         })
+        // A catalog model can carry a variant of the provider endpoint, which would otherwise win over the
+        // configured one. A model on another origin (Azure, Bedrock, Vertex partner models) keeps its own.
+        if (item.settings?.baseURL !== undefined && catalogBaseURL !== undefined)
+          for (const [id, model] of providers.get(providerID)?.models ?? [])
+            if (model.settings?.baseURL !== undefined && sameOrigin(model.settings.baseURL, catalogBaseURL))
+              providers.models.update(providerID, id, (model) => {
+                if (model.settings) delete model.settings.baseURL
+              })
         const definitions = new Map<string, { readonly inherit: boolean; readonly base?: Model.Info }>()
         for (const [id, config] of Object.entries(item.models ?? {})) {
           const base = source?.models.get(config.modelID ?? id) ?? source?.models.get(id)
@@ -196,3 +206,11 @@ function configuredProviders(entries: readonly Entry[]) {
     .filter((entry): entry is Document => entry.type === "document")
     .flatMap((file) => Object.entries(file.info.providers ?? {}))
 }
+
+const sameOrigin = (a: string, b: string) => {
+  try {
+    return new URL(a).origin === new URL(b).origin
+  } catch {
+    return false
+  }
+}

packages/core/test/config/provider.test.ts

@@ -690,6 +690,90 @@ describe("ConfigProviderPlugin.Plugin", () => {
     }),
   )
 
+  it.effect("sends catalog models with their own endpoint to the configured provider baseURL", () =>
+    Effect.gen(function* () {
+      const providers = yield* Provider.Service
+      const models = yield* Model.Service
+      const providerID = Provider.ID.make("custom")
+      yield* providers.transform((editor) => {
+        editor.update(providerID, (provider) => {
+          provider.package = "@opencode/ai/providers/openai/chat"
+          provider.settings = { baseURL: "https://catalog.example/v1" }
+        })
+        for (const id of ["chat", "listed"])
+          editor.models.update(providerID, Model.ID.make(id), (model) => {
+            model.settings = { baseURL: "https://catalog.example/v1" }
+          })
+      })
+      yield* addPlugin([
+        new Document({
+          type: "document",
+          info: decode({
+            providers: {
+              custom: {
+                settings: { baseURL: "https://gateway.example/v1" },
+                models: { listed: { settings: { baseURL: "https://listed.example/v1" } } },
+              },
+            },
+          }),
+        }),
+      ])
+
+      const resolver = yield* ModelResolver.Service
+      const endpoint = (id: string) =>
+        models.get(providerID, Model.ID.make(id)).pipe(
+          Effect.flatMap((model) => resolver.resolveModel(required(model))),
+          Effect.map((resolved) => resolved.model.route.endpoint.baseURL),
+        )
+      expect(yield* endpoint("chat")).toBe("https://gateway.example/v1")
+      expect(yield* endpoint("listed")).toBe("https://listed.example/v1")
+    }).pipe(Effect.provide(ModelResolver.layer)),
+  )
+
+  it.effect("keeps a catalog model endpoint on another origin, or under a provider with no catalog baseURL", () =>
+    Effect.gen(function* () {
+      const providers = yield* Provider.Service
+      const models = yield* Model.Service
+      const withBase = Provider.ID.make("custom")
+      const withoutBase = Provider.ID.make("partner")
+      yield* providers.transform((editor) => {
+        editor.update(withBase, (provider) => {
+          provider.package = "@opencode/ai/providers/openai/chat"
+          provider.settings = { baseURL: "https://catalog.example/v1" }
+        })
+        editor.models.update(withBase, Model.ID.make("partner-model"), (model) => {
+          model.settings = { baseURL: "https://partner.example/models" }
+        })
+        editor.update(withoutBase, (provider) => {
+          provider.package = "@opencode/ai/providers/openai/chat"
+        })
+        editor.models.update(withoutBase, Model.ID.make("claude"), (model) => {
+          model.settings = { baseURL: "https://resource.example/anthropic/v1" }
+        })
+      })
+      yield* addPlugin([
+        new Document({
+          type: "document",
+          info: decode({
+            providers: {
+              custom: { settings: { baseURL: "https://gateway.example/v1" } },
+              partner: { settings: { baseURL: "https://vpc.example/v1" } },
+            },
+          }),
+        }),
+      ])
+
+      const resolver = yield* ModelResolver.Service
+      const endpoint = (providerID: Provider.ID, id: string) =>
+        models.get(providerID, Model.ID.make(id)).pipe(
+          Effect.flatMap((model) => resolver.resolveModel(required(model))),
+          Effect.map((resolved) => resolved.model.route.endpoint.baseURL),
+        )
+      expect(yield* endpoint(withBase, "partner-model")).toBe("https://partner.example/models")
+      expect(yield* endpoint(withoutBase, "claude")).toBe("https://resource.example/anthropic/v1")
+    }).pipe(Effect.provide(ModelResolver.layer)),
+  )
+
   it.effect("generates variants after rewriting a configured model package", () =>
     Effect.gen(function* () {
       const models = yield* Model.Service