diff --git a/app.py b/app.py
index 93b5c06..1fdeddd 100644
--- a/app.py
+++ b/app.py
@@ -4517,33 +4517,51 @@ def chat():
 @csrf.exempt
 @login_required
 def chat_settings():
-    """Get or update chat settings (thinking level)"""
+    """Get or update chat settings (model selection, monthly cost)"""
     if request.method == 'GET':
-        # Get current thinking level from session or default
-        thinking_level = session.get('thinking_level', 'high')
+        # Get current model from session or default to flash
+        model = session.get('chat_model', 'flash')
+
+        # Calculate monthly cost for current user
+        monthly_cost = 0.0
+        try:
+            from database import AIApiCost
+            db = SessionLocal()
+            # Get first day of current month
+            first_day = datetime.now().replace(day=1, hour=0, minute=0, second=0, microsecond=0)
+            costs = db.query(AIApiCost).filter(
+                AIApiCost.user_id == current_user.id,
+                AIApiCost.timestamp >= first_day
+            ).all()
+            monthly_cost = sum(c.total_cost_usd or 0 for c in costs)
+            db.close()
+        except Exception as e:
+            logger.warning(f"Error calculating monthly cost: {e}")
+
         return jsonify({
             'success': True,
-            'thinking_level': thinking_level
+            'model': model,
+            'monthly_cost': round(monthly_cost, 4)
         })
 
     # POST - update settings
     try:
         data = request.get_json()
-        thinking_level = data.get('thinking_level', 'high')
+        model = data.get('model', 'flash')
 
-        # Validate thinking level
-        valid_levels = ['minimal', 'low', 'medium', 'high']
-        if thinking_level not in valid_levels:
-            thinking_level = 'high'
+        # Validate model
+        valid_models = ['flash', 'pro']
+        if model not in valid_models:
+            model = 'flash'
 
         # Store in session
-        session['thinking_level'] = thinking_level
+        session['chat_model'] = model
 
-        logger.info(f"User {current_user.id} set thinking_level to: {thinking_level}")
+        logger.info(f"User {current_user.id} set chat_model to: {model}")
 
         return jsonify({
             'success': True,
-            'thinking_level': thinking_level
+            'model': model
         })
 
     except Exception as e:
@@ -4602,24 +4620,28 @@ def chat_send_message(conversation_id):
         finally:
             db.close()
 
-        # Get thinking level from request or session
-        thinking_level = data.get('thinking_level') or session.get('thinking_level', 'high')
+        # Get model from request or session (flash = default, pro = premium)
+        model_choice = data.get('model') or session.get('chat_model', 'flash')
 
-        chat_engine = NordaBizChatEngine()
+        # Map model choice to actual model name
+        model_map = {
+            'flash': '3-flash',
+            'pro': '3-pro'
+        }
+        model_key = model_map.get(model_choice, '3-flash')
+
+        chat_engine = NordaBizChatEngine(model=model_key)
         response = chat_engine.send_message(
             conversation_id=conversation_id,
             user_message=message,
             user_id=current_user.id,
-            thinking_level=thinking_level
+            thinking_level='minimal' if model_choice == 'flash' else 'high'
         )
 
-        # Get free tier usage stats for today
-        free_tier_stats = get_free_tier_usage()
-
-        # Calculate theoretical cost (Gemini 2.0 Flash pricing)
+        # Get actual cost from response
         tokens_in = response.tokens_input or 0
         tokens_out = response.tokens_output or 0
-        theoretical_cost = (tokens_in / 1_000_000) * 0.075 + (tokens_out / 1_000_000) * 0.30
+        actual_cost = response.cost_usd or 0.0
 
         return jsonify({
             'success': True,
@@ -4628,24 +4650,12 @@ def chat_send_message(conversation_id):
             'created_at': response.created_at.isoformat(),
             # Technical metadata
             'tech_info': {
-                'model': gemini_service.get_gemini_service().model_name if gemini_service.get_gemini_service() else 'gemini-3-flash-preview',
-                'thinking_level': thinking_level,
-                'thinking_enabled': gemini_service.get_gemini_service().thinking_enabled if gemini_service.get_gemini_service() else True,
-                'data_source': 'PostgreSQL (150 firm Norda Biznes)',
-                'architecture': 'Full DB Context + Thinking Mode',
+                'model': model_choice,
                 'tokens_input': tokens_in,
                 'tokens_output': tokens_out,
                 'tokens_total': tokens_in + tokens_out,
                 'latency_ms': response.latency_ms or 0,
-                'theoretical_cost_usd': round(theoretical_cost, 6),
-                'actual_cost_usd': 0.0,  # Paid tier but tracked
-                'free_tier': {
-                    'is_free': False,
-                    'daily_limit': 10000,  # Gemini paid tier
-                    'requests_today': free_tier_stats['requests_today'],
-                    'tokens_today': free_tier_stats['tokens_today'],
-                    'remaining': max(0, 10000 - free_tier_stats['requests_today'])
-                }
+                'cost_usd': round(actual_cost, 6)
             }
         })
 
diff --git a/nordabiz_chat.py b/nordabiz_chat.py
index 613da82..d1ebd07 100644
--- a/nordabiz_chat.py
+++ b/nordabiz_chat.py
@@ -86,21 +86,29 @@ class NordaBizChatEngine:
     Helps users find companies, services, and business partners.
     """
 
-    def __init__(self, gemini_api_key: Optional[str] = None, use_global_service: bool = True):
+    def __init__(self, gemini_api_key: Optional[str] = None, use_global_service: bool = True, model: str = None):
         """
         Initialize Norda Biznes Chat Engine
 
         Args:
             gemini_api_key: Google Gemini API key (uses env var if not provided)
             use_global_service: Use global gemini_service for automatic cost tracking (default: True)
+            model: Model key ('3-flash', '3-pro') - if provided, creates new service with this model
         """
         self.use_global_service = use_global_service
+        self.requested_model = model
 
         if use_global_service:
-            # Use global gemini_service for automatic cost tracking to ai_api_costs table
-            self.gemini_service = gemini_service.get_gemini_service()
-            # Get model name from global service (currently Gemini 3 Flash Preview)
-            self.model_name = self.gemini_service.model_name if self.gemini_service else "gemini-3-flash-preview"
+            if model:
+                # Create new service with requested model
+                from gemini_service import GeminiService
+                self.gemini_service = GeminiService(model=model)
+                self.model_name = self.gemini_service.model_name
+            else:
+                # Use global gemini_service for automatic cost tracking to ai_api_costs table
+                self.gemini_service = gemini_service.get_gemini_service()
+                # Get model name from global service (currently Gemini 3 Flash Preview)
+                self.model_name = self.gemini_service.model_name if self.gemini_service else "gemini-3-flash-preview"
             self.model = None
 
             # Initialize tokenizer for cost calculation (still needed for per-message tracking)
diff --git a/templates/chat.html b/templates/chat.html
index 0c25501..77d1c3b 100755
--- a/templates/chat.html
+++ b/templates/chat.html
@@ -311,6 +311,11 @@
         font-style: italic;
     }
 
+    .thinking-badge-cost {
+        color: #f59e0b;
+        font-weight: 500;
+    }
+
     /* Klikalne linki jako kolorowe badge'y */
     .message-content a {
         display: inline-block;
@@ -724,6 +729,49 @@
         font-weight: 500;
     }
 
+    .thinking-option-badge.premium {
+        background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
+    }
+
+    .thinking-option-price {
+        display: block;
+        font-size: 11px;
+        color: #6b7280;
+        margin-top: 4px;
+        font-style: italic;
+    }
+
+    /* Monthly Cost Badge */
+    .monthly-cost-badge {
+        display: flex;
+        align-items: center;
+        gap: 6px;
+        background: rgba(255,255,255,0.15);
+        padding: 6px 12px;
+        border-radius: var(--radius-md);
+        font-size: 12px;
+        margin-left: var(--spacing-sm);
+    }
+
+    .monthly-cost-badge .cost-icon {
+        font-size: 14px;
+    }
+
+    .monthly-cost-badge .cost-label {
+        opacity: 0.8;
+    }
+
+    .monthly-cost-badge .cost-value {
+        font-weight: 600;
+        color: #fef08a;
+    }
+
+    @media (max-width: 768px) {
+        .monthly-cost-badge .cost-label {
+            display: none;
+        }
+    }
+
     .thinking-option-desc {
         color: var(--text-secondary);
         font-size: var(--font-size-xs);
@@ -1181,45 +1229,46 @@
                 </button>
                 <span style="font-size: 1.5rem;">🤖</span>
                 <h1>NordaGPT</h1>
-                <span class="chat-header-badge">Gemini 3</span>
-                <!-- Thinking Mode Toggle -->
-                <div class="thinking-toggle" id="thinkingToggle">
-                    <button class="thinking-btn" onclick="toggleThinkingDropdown()" title="Tryb rozumowania AI">
-                        <span class="thinking-icon">🧠</span>
-                        <span class="thinking-label" id="thinkingLabel">Wysoki</span>
+                <!-- Model Selection Toggle -->
+                <div class="thinking-toggle" id="modelToggle">
+                    <button class="thinking-btn" onclick="toggleModelDropdown()" title="Wybierz model AI">
+                        <span class="thinking-icon" id="modelIcon">⚡</span>
+                        <span class="thinking-label" id="modelLabel">Flash</span>
                         <svg class="thinking-arrow" fill="none" stroke="currentColor" viewBox="0 0 24 24" width="12" height="12">
                             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7"/>
                         </svg>
                     </button>
-                    <div class="thinking-dropdown" id="thinkingDropdown">
+                    <div class="thinking-dropdown" id="modelDropdown">
                         <div class="thinking-dropdown-header">
-                            <strong>Tryb rozumowania AI</strong>
-                            <p>Określa głębokość analizy przed odpowiedzią</p>
+                            <strong>Model AI</strong>
+                            <p>Wybierz model dopasowany do pytania</p>
                         </div>
-                        <div class="thinking-option" data-level="minimal" onclick="setThinkingLevel('minimal')">
+                        <div class="thinking-option active" data-model="flash" onclick="setModel('flash')">
                             <div class="thinking-option-header">
                                 <span class="thinking-option-icon">⚡</span>
-                                <span class="thinking-option-name">Błyskawiczny</span>
-                            </div>
-                            <p class="thinking-option-desc">Najszybsze odpowiedzi. Dla prostych pytań typu "kto?", "gdzie?".</p>
-                        </div>
-                        <div class="thinking-option" data-level="low" onclick="setThinkingLevel('low')">
-                            <div class="thinking-option-header">
-                                <span class="thinking-option-icon">🚀</span>
-                                <span class="thinking-option-name">Szybki</span>
-                            </div>
-                            <p class="thinking-option-desc">Zrównoważony. Dobre dla większości pytań o firmy i usługi.</p>
-                        </div>
-                        <div class="thinking-option active" data-level="high" onclick="setThinkingLevel('high')">
-                            <div class="thinking-option-header">
-                                <span class="thinking-option-icon">🧠</span>
-                                <span class="thinking-option-name">Głęboki</span>
+                                <span class="thinking-option-name">Gemini Flash</span>
                                 <span class="thinking-option-badge">Domyślny</span>
                             </div>
-                            <p class="thinking-option-desc">Maksymalna analiza. Dla złożonych pytań, rekomendacji, strategii.</p>
+                            <p class="thinking-option-desc">Szybki i ekonomiczny. Dla prostych pytań o firmy, kontakty, wydarzenia.</p>
+                            <span class="thinking-option-price">~$0.05/pytanie</span>
+                        </div>
+                        <div class="thinking-option" data-model="pro" onclick="setModel('pro')">
+                            <div class="thinking-option-header">
+                                <span class="thinking-option-icon">🧠</span>
+                                <span class="thinking-option-name">Gemini Pro</span>
+                                <span class="thinking-option-badge premium">Premium</span>
+                            </div>
+                            <p class="thinking-option-desc">Głęboka analiza. Dla złożonych pytań, strategii, rekomendacji.</p>
+                            <span class="thinking-option-price">~$0.20/pytanie</span>
                         </div>
                     </div>
                 </div>
+                <!-- Monthly cost display -->
+                <div class="monthly-cost-badge" title="Twoje koszty AI w tym miesiącu">
+                    <span class="cost-icon">💰</span>
+                    <span class="cost-label">Ten miesiąc:</span>
+                    <span class="cost-value" id="monthlyCostDisplay">$0.00</span>
+                </div>
                 <button class="model-info-btn" onclick="openModelInfoModal()" title="Informacje o modelu AI">
                     <svg fill="none" stroke="currentColor" viewBox="0 0 24 24" width="16" height="16">
                         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/>
@@ -1431,57 +1480,67 @@
 // NordaGPT Chat - State
 let currentConversationId = null;
 let conversations = [];
-let currentThinkingLevel = 'high';  // Default thinking level
+let currentModel = 'flash';  // Default model (flash = ekonomiczny)
+let monthlyUsageCost = 0;    // Koszt miesięczny użytkownika
 
 // ============================================
-// Thinking Mode Toggle Functions
+// Model Selection Toggle Functions
 // ============================================
-const THINKING_LABELS = {
-    'minimal': 'Błyskawiczny',
-    'low': 'Szybki',
-    'high': 'Głęboki'
+const MODEL_CONFIG = {
+    'flash': { label: 'Flash', icon: '⚡', desc: 'Szybki' },
+    'pro': { label: 'Pro', icon: '🧠', desc: 'Analiza' }
 };
 
-function toggleThinkingDropdown() {
-    const toggle = document.getElementById('thinkingToggle');
+function toggleModelDropdown() {
+    const toggle = document.getElementById('modelToggle');
     toggle.classList.toggle('open');
 }
 
-function setThinkingLevel(level) {
-    currentThinkingLevel = level;
+function setModel(model) {
+    currentModel = model;
+    const config = MODEL_CONFIG[model];
 
     // Update UI
-    document.getElementById('thinkingLabel').textContent = THINKING_LABELS[level] || level;
+    document.getElementById('modelLabel').textContent = config.label;
+    document.getElementById('modelIcon').textContent = config.icon;
 
     // Update active state
     document.querySelectorAll('.thinking-option').forEach(opt => {
-        opt.classList.toggle('active', opt.dataset.level === level);
+        opt.classList.toggle('active', opt.dataset.model === model);
     });
 
     // Close dropdown
-    document.getElementById('thinkingToggle').classList.remove('open');
+    document.getElementById('modelToggle').classList.remove('open');
 
     // Save preference to server
-    saveThinkingPreference(level);
+    saveModelPreference(model);
 
-    console.log('Thinking level set to:', level);
+    console.log('Model set to:', model);
 }
 
-async function saveThinkingPreference(level) {
+async function saveModelPreference(model) {
     try {
         await fetch('/api/chat/settings', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
-            body: JSON.stringify({ thinking_level: level })
+            body: JSON.stringify({ model: model })
         });
     } catch (error) {
-        console.error('Failed to save thinking preference:', error);
+        console.error('Failed to save model preference:', error);
     }
 }
 
-// Close thinking dropdown when clicking outside
+function updateMonthlyCost(cost) {
+    monthlyUsageCost += cost;
+    const costDisplay = document.getElementById('monthlyCostDisplay');
+    if (costDisplay) {
+        costDisplay.textContent = '$' + monthlyUsageCost.toFixed(2);
+    }
+}
+
+// Close model dropdown when clicking outside
 document.addEventListener('click', function(e) {
-    const toggle = document.getElementById('thinkingToggle');
+    const toggle = document.getElementById('modelToggle');
     if (toggle && !toggle.contains(e.target)) {
         toggle.classList.remove('open');
     }
@@ -1552,23 +1611,33 @@ document.addEventListener('click', function(e) {
 document.addEventListener('DOMContentLoaded', function() {
     loadConversations();
     autoResizeTextarea();
-    loadThinkingSettings();
+    loadModelSettings();
 });
 
-// Load thinking settings from server
-async function loadThinkingSettings() {
+// Load model settings and monthly cost from server
+async function loadModelSettings() {
     try {
         const response = await fetch('/api/chat/settings');
         const data = await response.json();
-        if (data.success && data.thinking_level) {
-            currentThinkingLevel = data.thinking_level;
-            document.getElementById('thinkingLabel').textContent = THINKING_LABELS[data.thinking_level] || data.thinking_level;
-            document.querySelectorAll('.thinking-option').forEach(opt => {
-                opt.classList.toggle('active', opt.dataset.level === data.thinking_level);
-            });
+        if (data.success) {
+            // Load model preference
+            if (data.model) {
+                currentModel = data.model;
+                const config = MODEL_CONFIG[data.model] || MODEL_CONFIG['flash'];
+                document.getElementById('modelLabel').textContent = config.label;
+                document.getElementById('modelIcon').textContent = config.icon;
+                document.querySelectorAll('.thinking-option').forEach(opt => {
+                    opt.classList.toggle('active', opt.dataset.model === data.model);
+                });
+            }
+            // Load monthly cost
+            if (data.monthly_cost !== undefined) {
+                monthlyUsageCost = data.monthly_cost;
+                document.getElementById('monthlyCostDisplay').textContent = '$' + monthlyUsageCost.toFixed(2);
+            }
         }
     } catch (error) {
-        console.log('Using default thinking level:', currentThinkingLevel);
+        console.log('Using default model:', currentModel);
     }
 }
 
@@ -1769,13 +1838,13 @@ async function sendMessage() {
             }
         }
 
-        // Send message with thinking level
+        // Send message with model selection
         const response = await fetch(`/api/chat/${currentConversationId}/message`, {
             method: 'POST',
             headers: { 'Content-Type': 'application/json' },
             body: JSON.stringify({
                 message: message,
-                thinking_level: currentThinkingLevel
+                model: currentModel
             })
         });
         const data = await response.json();
@@ -1826,33 +1895,35 @@ function addMessage(role, content, animate = true, techInfo = null) {
     contentDiv.className = 'message-content';
     contentDiv.innerHTML = formatMessage(content);
 
-    // Add thinking info badge for AI responses
+    // Add response info badge for AI responses (model, time, cost)
     if (role === 'assistant' && techInfo) {
-        const thinkingBadge = document.createElement('div');
-        thinkingBadge.className = 'thinking-info-badge';
+        const infoBadge = document.createElement('div');
+        infoBadge.className = 'thinking-info-badge';
 
-        const thinkingLevel = techInfo.thinking_level || 'high';
+        const modelName = techInfo.model || 'flash';
         const latencyMs = techInfo.latency_ms || 0;
         const latencySec = (latencyMs / 1000).toFixed(1);
+        const costUsd = techInfo.cost_usd || 0;
 
-        // Labels with quality descriptions to show value of deeper thinking
-        const levelLabels = {
-            'minimal': '⚡ Błyskawiczny',
-            'low': '🚀 Szybki',
-            'medium': '⚖️ Zbalansowany',
-            'high': '🧠 Głęboka analiza'
+        // Model labels
+        const modelLabels = {
+            'flash': '⚡ Flash',
+            'pro': '🧠 Pro',
+            'gemini-3-flash-preview': '⚡ Flash',
+            'gemini-3-pro-preview': '🧠 Pro'
         };
-        const levelDescriptions = {
-            'minimal': 'szybka odpowiedź',
-            'low': 'zwięzła analiza',
-            'medium': 'przemyślana odpowiedź',
-            'high': 'dogłębna analiza z weryfikacją'
-        };
-        const levelLabel = levelLabels[thinkingLevel] || thinkingLevel;
-        const levelDesc = levelDescriptions[thinkingLevel] || '';
+        const modelLabel = modelLabels[modelName] || modelName;
 
-        thinkingBadge.innerHTML = `<span class="thinking-badge-level">${levelLabel}</span> · <span class="thinking-badge-desc">${levelDesc}</span> · <span class="thinking-badge-time">${latencySec}s</span>`;
-        contentDiv.appendChild(thinkingBadge);
+        // Format cost
+        const costStr = costUsd > 0 ? `$${costUsd.toFixed(4)}` : '$0.00';
+
+        infoBadge.innerHTML = `<span class="thinking-badge-level">${modelLabel}</span> · <span class="thinking-badge-time">${latencySec}s</span> · <span class="thinking-badge-cost">${costStr}</span>`;
+        contentDiv.appendChild(infoBadge);
+
+        // Update monthly cost if cost provided
+        if (costUsd > 0) {
+            updateMonthlyCost(costUsd);
+        }
     }
 
     messageDiv.appendChild(avatar);