diff --git a/opencode/packages/opencode/src/provider/provider.ts b/opencode/packages/opencode/src/provider/provider.ts
index 64bc19f..cf16324 100644
--- a/opencode/packages/opencode/src/provider/provider.ts
+++ b/opencode/packages/opencode/src/provider/provider.ts
@@ -940,7 +940,10 @@ export namespace Provider {
               write: model?.cost?.cache_write ?? existingModel?.cost?.cache.write ?? 0,
             },
           },
-          options: mergeDeep(existingModel?.options ?? {}, model.options ?? {}, model.providerPreference ? { providerPreference: model.providerPreference } : {}),
+          options: mergeDeep(
+            mergeDeep(existingModel?.options ?? {}, model.options ?? {}),
+            model.providerPreference ? { providerPreference: model.providerPreference } : {}
+          ),
           limit: {
             context: model.limit?.context ?? existingModel?.limit?.context ?? 0,
             output: model.limit?.output ?? existingModel?.limit?.output ?? 0,