Add Codex plan/spark provider support

src/utils/model/model.ts

@@ -318,6 +318,12 @@ export function renderDefaultModelSetting(
   if (setting === 'opusplan') {
     return 'Opus 4.6 in plan mode, else Sonnet 4.6'
   }
+  if (setting === 'codexplan') {
+    return 'Codex Plan (GPT-5.4 high reasoning)'
+  }
+  if (setting === 'codexspark') {
+    return 'Codex Spark (GPT-5.3 Codex Spark)'
+  }
   return renderModelName(parseUserSpecifiedModel(setting))
 }
 
@@ -352,6 +358,12 @@ export function renderModelSetting(setting: ModelName | ModelAlias): string {
   if (setting === 'opusplan') {
     return 'Opus Plan'
   }
+  if (setting === 'codexplan') {
+    return 'Codex Plan'
+  }
+  if (setting === 'codexspark') {
+    return 'Codex Spark'
+  }
   if (isModelAlias(setting)) {
     return capitalize(setting)
   }
@@ -365,6 +377,10 @@ export function renderModelSetting(setting: ModelName | ModelAlias): string {
  */
 export function getPublicModelDisplayName(model: ModelName): string | null {
   switch (model) {
+    case 'gpt-5.4':
+      return 'GPT-5.4'
+    case 'gpt-5.3-codex-spark':
+      return 'GPT-5.3 Codex Spark'
     case getModelStrings().opus46:
       return 'Opus 4.6'
     case getModelStrings().opus46 + '[1m]':
@@ -472,6 +488,10 @@ export function parseUserSpecifiedModel(
 
   if (isModelAlias(modelString)) {
     switch (modelString) {
+      case 'codexplan':
+        return modelInputTrimmed
+      case 'codexspark':
+        return modelInputTrimmed
       case 'opusplan':
         return getDefaultSonnetModel() + (has1mTag ? '[1m]' : '') // Sonnet is default, Opus in plan mode
       case 'sonnet':