diff --git a/apps/server/src/provider/Layers/ClaudeProvider.ts b/apps/server/src/provider/Layers/ClaudeProvider.ts
index 761b795fe5..9feec28637 100644
--- a/apps/server/src/provider/Layers/ClaudeProvider.ts
+++ b/apps/server/src/provider/Layers/ClaudeProvider.ts
@@ -27,6 +27,14 @@ import { ClaudeProvider } from "../Services/ClaudeProvider";
 import { ServerSettingsService } from "../../serverSettings";
 import { ServerSettingsError } from "@t3tools/contracts";
 
+const DEFAULT_CLAUDE_MODEL_CAPABILITIES: ModelCapabilities = {
+  reasoningEffortLevels: [],
+  supportsFastMode: false,
+  supportsThinkingToggle: false,
+  contextWindowOptions: [],
+  promptInjectedEffortLevels: [],
+};
+
 const PROVIDER = "claudeAgent" as const;
 const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
   {
@@ -87,13 +95,8 @@ const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
 export function getClaudeModelCapabilities(model: string | null | undefined): ModelCapabilities {
   const slug = model?.trim();
   return (
-    BUILT_IN_MODELS.find((candidate) => candidate.slug === slug)?.capabilities ?? {
-      reasoningEffortLevels: [],
-      supportsFastMode: false,
-      supportsThinkingToggle: false,
-      contextWindowOptions: [],
-      promptInjectedEffortLevels: [],
-    }
+    BUILT_IN_MODELS.find((candidate) => candidate.slug === slug)?.capabilities ??
+    DEFAULT_CLAUDE_MODEL_CAPABILITIES
   );
 }
 
@@ -450,7 +453,12 @@ export const checkClaudeProviderStatus = Effect.fn("checkClaudeProviderStatus")(
     Effect.map((settings) => settings.providers.claudeAgent),
   );
   const checkedAt = new Date().toISOString();
-  const models = providerModelsFromSettings(BUILT_IN_MODELS, PROVIDER, claudeSettings.customModels);
+  const models = providerModelsFromSettings(
+    BUILT_IN_MODELS,
+    PROVIDER,
+    claudeSettings.customModels,
+    DEFAULT_CLAUDE_MODEL_CAPABILITIES,
+  );
 
   if (!claudeSettings.enabled) {
     return buildServerProvider({
diff --git a/apps/server/src/provider/Layers/CodexProvider.ts b/apps/server/src/provider/Layers/CodexProvider.ts
index 667bdf048b..3509fa9257 100644
--- a/apps/server/src/provider/Layers/CodexProvider.ts
+++ b/apps/server/src/provider/Layers/CodexProvider.ts
@@ -49,6 +49,19 @@ import { CodexProvider } from "../Services/CodexProvider";
 import { ServerSettingsService } from "../../serverSettings";
 import { ServerSettingsError } from "@t3tools/contracts";
 
+const DEFAULT_CODEX_MODEL_CAPABILITIES: ModelCapabilities = {
+  reasoningEffortLevels: [
+    { value: "xhigh", label: "Extra High" },
+    { value: "high", label: "High", isDefault: true },
+    { value: "medium", label: "Medium" },
+    { value: "low", label: "Low" },
+  ],
+  supportsFastMode: true,
+  supportsThinkingToggle: false,
+  contextWindowOptions: [],
+  promptInjectedEffortLevels: [],
+};
+
 const PROVIDER = "codex" as const;
 const OPENAI_AUTH_PROVIDERS = new Set(["openai"]);
 const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
@@ -159,13 +172,8 @@ const BUILT_IN_MODELS: ReadonlyArray<ServerProviderModel> = [
 export function getCodexModelCapabilities(model: string | null | undefined): ModelCapabilities {
   const slug = model?.trim();
   return (
-    BUILT_IN_MODELS.find((candidate) => candidate.slug === slug)?.capabilities ?? {
-      reasoningEffortLevels: [],
-      supportsFastMode: false,
-      supportsThinkingToggle: false,
-      contextWindowOptions: [],
-      promptInjectedEffortLevels: [],
-    }
+    BUILT_IN_MODELS.find((candidate) => candidate.slug === slug)?.capabilities ??
+    DEFAULT_CODEX_MODEL_CAPABILITIES
   );
 }
 
@@ -339,7 +347,12 @@ export const checkCodexProviderStatus = Effect.fn("checkCodexProviderStatus")(fu
     Effect.map((settings) => settings.providers.codex),
   );
   const checkedAt = new Date().toISOString();
-  const models = providerModelsFromSettings(BUILT_IN_MODELS, PROVIDER, codexSettings.customModels);
+  const models = providerModelsFromSettings(
+    BUILT_IN_MODELS,
+    PROVIDER,
+    codexSettings.customModels,
+    DEFAULT_CODEX_MODEL_CAPABILITIES,
+  );
 
   if (!codexSettings.enabled) {
     return buildServerProvider({
diff --git a/apps/server/src/provider/providerSnapshot.ts b/apps/server/src/provider/providerSnapshot.ts
index e1243c4bd0..4c80d78e20 100644
--- a/apps/server/src/provider/providerSnapshot.ts
+++ b/apps/server/src/provider/providerSnapshot.ts
@@ -1,4 +1,5 @@
 import type {
+  ModelCapabilities,
   ServerProvider,
   ServerProviderAuth,
   ServerProviderModel,
@@ -102,6 +103,7 @@ export function providerModelsFromSettings(
   builtInModels: ReadonlyArray<ServerProviderModel>,
   provider: ServerProvider["provider"],
   customModels: ReadonlyArray<string>,
+  customModelCapabilities: ModelCapabilities,
 ): ReadonlyArray<ServerProviderModel> {
   const resolvedBuiltInModels = [...builtInModels];
   const seen = new Set(resolvedBuiltInModels.map((model) => model.slug));
@@ -117,7 +119,7 @@ export function providerModelsFromSettings(
       slug: normalized,
       name: normalized,
       isCustom: true,
-      capabilities: null,
+      capabilities: customModelCapabilities,
     });
   }