diff --git a/client/src/components/ai-chat.tsx b/client/src/components/ai-chat.tsx
index bb2d530..55320bd 100644
--- a/client/src/components/ai-chat.tsx
+++ b/client/src/components/ai-chat.tsx
@@ -6,7 +6,7 @@ import { useMutation, useQuery } from "@tanstack/react-query";
 import { apiRequest, queryClient } from "@/lib/queryClient";
 import { Bot, User, Lightbulb, History, Zap, Sparkles, Loader2 } from "lucide-react";
 import { useToast } from "@/hooks/use-toast";
-import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
+import { ModelCombobox } from "@/components/model-combobox";
 
 interface Message {
   role: "user" | "assistant";
@@ -114,32 +114,16 @@ export default function AiChat() {
         
         <div className="flex items-center gap-3">
           <label className="text-sm font-medium text-foreground">Modèle IA:</label>
-          <Select value={selectedModel} onValueChange={setSelectedModel} disabled={modelsLoading}>
-            <SelectTrigger className="w-[300px] rounded-xl" data-testid="select-ai-model">
-              {modelsLoading ? (
-                <div className="flex items-center gap-2">
-                  <Loader2 className="w-4 h-4 animate-spin" />
-                  <span>Chargement des modèles...</span>
-                </div>
-              ) : (
-                <SelectValue placeholder="Sélectionner un modèle" />
-              )}
-            </SelectTrigger>
-            <SelectContent className="max-h-[300px] overflow-y-auto">
-              {availableModels.map((model: OpenRouterModel) => (
-                <SelectItem key={model.id} value={model.id} data-testid={`model-option-${model.id}`}>
-                  <div className="flex flex-col">
-                    <span className="font-medium">{model.name}</span>
-                    {model.pricing && (
-                      <span className="text-xs text-muted-foreground">
-                        ${model.pricing.prompt} / ${model.pricing.completion}
-                      </span>
-                    )}
-                  </div>
-                </SelectItem>
-              ))}
-            </SelectContent>
-          </Select>
+          <ModelCombobox
+            models={availableModels}
+            value={selectedModel}
+            onValueChange={setSelectedModel}
+            placeholder="Sélectionner un modèle"
+            isLoading={modelsLoading}
+            disabled={modelsLoading}
+            className="w-[300px] rounded-xl"
+            testId="select-ai-model"
+          />
         </div>
       </div>
 
diff --git a/client/src/components/model-combobox.tsx b/client/src/components/model-combobox.tsx
new file mode 100644
index 0000000..90f6de2
--- /dev/null
+++ b/client/src/components/model-combobox.tsx
@@ -0,0 +1,134 @@
+import { useState } from "react";
+import { Check, ChevronsUpDown, Loader2 } from "lucide-react";
+import { cn } from "@/lib/utils";
+import { Button } from "@/components/ui/button";
+import {
+  Command,
+  CommandEmpty,
+  CommandGroup,
+  CommandInput,
+  CommandItem,
+  CommandList,
+} from "@/components/ui/command";
+import {
+  Popover,
+  PopoverContent,
+  PopoverTrigger,
+} from "@/components/ui/popover";
+
+interface Model {
+  id: string;
+  name: string;
+  pricing?: {
+    prompt: string;
+    completion: string;
+  };
+}
+
+interface ModelComboboxProps {
+  models: Model[];
+  value: string;
+  onValueChange: (value: string) => void;
+  placeholder?: string;
+  isLoading?: boolean;
+  disabled?: boolean;
+  className?: string;
+  testId?: string;
+}
+
+export function ModelCombobox({
+  models,
+  value,
+  onValueChange,
+  placeholder = "Sélectionner un modèle",
+  isLoading = false,
+  disabled = false,
+  className,
+  testId,
+}: ModelComboboxProps) {
+  const [open, setOpen] = useState(false);
+  const [searchQuery, setSearchQuery] = useState("");
+
+  const selectedModel = models.find((model) => model.id === value);
+
+  const filteredModels = models.filter((model) =>
+    model.name.toLowerCase().includes(searchQuery.toLowerCase()) ||
+    model.id.toLowerCase().includes(searchQuery.toLowerCase())
+  );
+
+  return (
+    <Popover open={open} onOpenChange={setOpen}>
+      <PopoverTrigger asChild>
+        <Button
+          variant="outline"
+          role="combobox"
+          aria-expanded={open}
+          className={cn("justify-between", className)}
+          disabled={disabled || isLoading}
+          data-testid={testId}
+        >
+          {isLoading ? (
+            <div className="flex items-center gap-2">
+              <Loader2 className="w-4 h-4 animate-spin" />
+              <span>Chargement des modèles...</span>
+            </div>
+          ) : selectedModel ? (
+            <div className="flex flex-col items-start w-full overflow-hidden">
+              <span className="font-medium truncate w-full">{selectedModel.name}</span>
+              {selectedModel.pricing && (
+                <span className="text-xs text-muted-foreground">
+                  ${selectedModel.pricing.prompt} / ${selectedModel.pricing.completion}
+                </span>
+              )}
+            </div>
+          ) : (
+            placeholder
+          )}
+          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
+        </Button>
+      </PopoverTrigger>
+      <PopoverContent className="w-[400px] p-0" align="start">
+        <Command shouldFilter={false}>
+          <CommandInput
+            placeholder="Rechercher un modèle..."
+            value={searchQuery}
+            onValueChange={setSearchQuery}
+            data-testid={`${testId}-search`}
+          />
+          <CommandList className="max-h-[300px] overflow-y-auto">
+            <CommandEmpty>Aucun modèle trouvé.</CommandEmpty>
+            <CommandGroup>
+              {filteredModels.map((model) => (
+                <CommandItem
+                  key={model.id}
+                  value={model.id}
+                  onSelect={(currentValue) => {
+                    onValueChange(currentValue);
+                    setOpen(false);
+                    setSearchQuery("");
+                  }}
+                  data-testid={`${testId}-option-${model.id}`}
+                >
+                  <Check
+                    className={cn(
+                      "mr-2 h-4 w-4",
+                      value === model.id ? "opacity-100" : "opacity-0"
+                    )}
+                  />
+                  <div className="flex flex-col flex-1 overflow-hidden">
+                    <span className="font-medium truncate">{model.name}</span>
+                    {model.pricing && (
+                      <span className="text-xs text-muted-foreground">
+                        Prompt: ${model.pricing.prompt} | Completion: ${model.pricing.completion}
+                      </span>
+                    )}
+                  </div>
+                </CommandItem>
+              ))}
+            </CommandGroup>
+          </CommandList>
+        </Command>
+      </PopoverContent>
+    </Popover>
+  );
+}
diff --git a/client/src/pages/settings.tsx b/client/src/pages/settings.tsx
index 788aabb..e3bf3cb 100644
--- a/client/src/pages/settings.tsx
+++ b/client/src/pages/settings.tsx
@@ -8,10 +8,10 @@ import { Label } from "@/components/ui/label";
 import { Switch } from "@/components/ui/switch";
 import { Input } from "@/components/ui/input";
 import { Textarea } from "@/components/ui/textarea";
-import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Button } from "@/components/ui/button";
 import { useToast } from "@/hooks/use-toast";
 import { apiRequest, queryClient } from "@/lib/queryClient";
+import { ModelCombobox } from "@/components/model-combobox";
 
 export default function Settings() {
   const [sidebarOpen, setSidebarOpen] = useState(false);
@@ -33,7 +33,7 @@ export default function Settings() {
     queryKey: ['/api/openrouter/config'],
   });
 
-  const { data: openrouterModels } = useQuery({
+  const { data: openrouterModels, isLoading: modelsLoading } = useQuery({
     queryKey: ['/api/openrouter/models'],
   });
 
@@ -227,18 +227,15 @@ export default function Settings() {
                 </div>
                 <div className="space-y-2">
                   <Label htmlFor="openrouterModel">Modèle d'IA</Label>
-                  <Select value={openrouterModel} onValueChange={setOpenrouterModel}>
-                    <SelectTrigger id="openrouterModel" data-testid="select-openrouter-model">
-                      <SelectValue placeholder="Sélectionner un modèle" />
-                    </SelectTrigger>
-                    <SelectContent>
-                      {(openrouterModels as any)?.data?.map((model: any) => (
-                        <SelectItem key={model.id} value={model.id}>
-                          {model.name}
-                        </SelectItem>
-                      ))}
-                    </SelectContent>
-                  </Select>
+                  <ModelCombobox
+                    models={(openrouterModels as any)?.data || []}
+                    value={openrouterModel}
+                    onValueChange={setOpenrouterModel}
+                    placeholder="Sélectionner un modèle"
+                    isLoading={modelsLoading}
+                    className="w-full"
+                    testId="select-openrouter-model"
+                  />
                   <p className="text-xs text-muted-foreground">
                     Choisissez le modèle d'IA pour générer vos publications
                   </p>
diff --git a/replit.md b/replit.md
index 37b5527..b527f0f 100644
--- a/replit.md
+++ b/replit.md
@@ -10,6 +10,9 @@ Preferred communication style: Simple, everyday language.
 
 ## Recent Changes
 
+### October 11, 2025
+- **Model Selector Improvement**: Replaced basic Select dropdowns with advanced ModelCombobox component featuring search and scroll functionality. The new combobox allows users to search models by name across 326+ OpenRouter models, displays pricing information (prompt/completion costs), and provides smooth scrolling through a max-height limited list. Implemented in both Settings page (OpenRouter configuration) and AI Assistant page. The combobox prevents accidental deselection and includes loading states with spinner for better UX.
+
 ### October 10, 2025
 - **Post Type Visual Indicators**: Added visual icons throughout the app to distinguish post types at a glance. Feed posts display Image icon (🖼️), Story posts display Smartphone icon (📱), and posts configured for both show both icons side-by-side. Icons appear consistently across calendar view (desktop grid and mobile list), dashboard "Historique des publications" section, and history page for improved visual clarity.
 - **Calendar Auto-Refresh**: Implemented automatic calendar data refresh every 30 seconds using TanStack Query's `refetchInterval` option. Calendar continuously fetches updated scheduled posts without requiring page reload or manual refresh, ensuring users see the latest schedule data in real-time.