diff --git a/src/agents/model-id-normalization.ts b/src/agents/model-id-normalization.ts
index 9b0b27a7f01..c0c694a0dfa 100644
--- a/src/agents/model-id-normalization.ts
+++ b/src/agents/model-id-normalization.ts
@@ -1,5 +1,5 @@
-// Keep model ID normalization dependency-free so config parsing and other
-// startup-only paths do not pull in provider discovery or plugin loading.
+// Keep these helpers dependency-free so config/model parsing can use them
+// without pulling in provider discovery or auth-profile graphs.
 export function normalizeGoogleModelId(id: string): string {
   if (id === "gemini-3-pro") {
     return "gemini-3-pro-preview";
diff --git a/src/agents/model-selection.ts b/src/agents/model-selection.ts
index acc29a32bf9..289d9d53290 100644
--- a/src/agents/model-selection.ts
+++ b/src/agents/model-selection.ts
@@ -16,12 +16,6 @@ import { DEFAULT_MODEL, DEFAULT_PROVIDER } from "./defaults.js";
 import type { ModelCatalogEntry } from "./model-catalog.js";
 import { normalizeGoogleModelId } from "./model-id-normalization.js";
 import { splitTrailingAuthProfile } from "./model-ref-profile.js";
-import {
-  findNormalizedProviderKey,
-  findNormalizedProviderValue,
-  normalizeProviderId,
-  normalizeProviderIdForAuth,
-} from "./provider-id.js";
 
 const log = createSubsystemLogger("model-selection");
 
@@ -41,6 +35,72 @@ function normalizeAliasKey(value: string): string {
   return value.trim().toLowerCase();
 }
 
+export function normalizeProviderId(provider: string): string {
+  const normalized = provider.trim().toLowerCase();
+  if (normalized === "z.ai" || normalized === "z-ai") {
+    return "zai";
+  }
+  if (normalized === "opencode-zen") {
+    return "opencode";
+  }
+  if (normalized === "opencode-go-auth") {
+    return "opencode-go";
+  }
+  if (normalized === "qwen") {
+    return "qwen-portal";
+  }
+  if (normalized === "kimi" || normalized === "kimi-code" || normalized === "kimi-coding") {
+    return "kimi";
+  }
+  if (normalized === "bedrock" || normalized === "aws-bedrock") {
+    return "amazon-bedrock";
+  }
+  // Backward compatibility for older provider naming.
+  if (normalized === "bytedance" || normalized === "doubao") {
+    return "volcengine";
+  }
+  return normalized;
+}
+
+/** Normalize provider ID for auth lookup. Coding-plan variants share auth with base. */
+export function normalizeProviderIdForAuth(provider: string): string {
+  const normalized = normalizeProviderId(provider);
+  if (normalized === "volcengine-plan") {
+    return "volcengine";
+  }
+  if (normalized === "byteplus-plan") {
+    return "byteplus";
+  }
+  return normalized;
+}
+
+export function findNormalizedProviderValue<T>(
+  entries: Record<string, T> | undefined,
+  provider: string,
+): T | undefined {
+  if (!entries) {
+    return undefined;
+  }
+  const providerKey = normalizeProviderId(provider);
+  for (const [key, value] of Object.entries(entries)) {
+    if (normalizeProviderId(key) === providerKey) {
+      return value;
+    }
+  }
+  return undefined;
+}
+
+export function findNormalizedProviderKey(
+  entries: Record<string, unknown> | undefined,
+  provider: string,
+): string | undefined {
+  if (!entries) {
+    return undefined;
+  }
+  const providerKey = normalizeProviderId(provider);
+  return Object.keys(entries).find((key) => normalizeProviderId(key) === providerKey);
+}
+
 export function modelKey(provider: string, model: string) {
   const providerId = provider.trim();
   const modelId = model.trim();
diff --git a/src/agents/models-config.providers.ts b/src/agents/models-config.providers.ts
index af9c3d6e34a..4281ad505cb 100644
--- a/src/agents/models-config.providers.ts
+++ b/src/agents/models-config.providers.ts
@@ -182,6 +182,8 @@ type ProfileApiKeyResolution = {
   discoveryApiKey?: string;
 };
 
+export { normalizeGoogleModelId };
+
 function toDiscoveryApiKey(value: string | undefined): string | undefined {
   const trimmed = value?.trim();
   if (!trimmed || isNonSecretApiKeyMarker(trimmed)) {