Add Mistral AI as inference provider with Voxtral Small transcription model

- Add support for multiple API providers (Groq and Mistral)
- Add collapsible API keys section in settings for both providers
- Label all models with their provider (Groq/Mistral)
- Add Voxtral Small (Mistral) transcription model
- Add Mistral Small and Mistral Medium AI refinement models
- Use user-friendly model names while maintaining correct API model values
- Update transcriber to route requests to correct provider based on model
- Update config to store separate API keys for each provider
- Add Mistral brand colors to CSS
- Style API keys dropdown section

Co-authored-by: jahruz67 <jahruz67@users.noreply.github.com>

app.go

@@ -344,8 +344,12 @@ func (a *App) processRecording(recordingPath string) {
 	isLocal := strings.HasPrefix(a.config.WhisperModel, "local-")
 
 	// IDIOT-PROOFING: Validate API key before attempting cloud transcription
-	if !isLocal && !strings.HasPrefix(a.config.APIKey, "gsk_") {
-		err = fmt.Errorf("invalid API key - must start with gsk_")
+	if !isLocal {
+		// Get the appropriate API key for the whisper model
+		apiKey := a.config.GetAPIKey(transcriber.GetProviderForModel(a.config.WhisperModel))
+		if apiKey == "" {
+			err = fmt.Errorf("API key is missing for the selected provider")
+		}
 	} else if isLocal {
 		// Use local whisper.cpp
 		if a.whisperManager == nil {
@@ -424,16 +428,25 @@ func (a *App) processRecording(recordingPath string) {
 // GetSettings returns the current configuration
 func (a *App) GetSettings() map[string]interface{} {
 	conf := make(map[string]interface{})
-	// Mask the API key: only reveal the last 4 characters so the user can verify
+	// Mask the API keys: only reveal the last 4 characters so the user can verify
 	// which key is configured without exposing the full secret to the frontend.
-	if a.config.APIKey != "" {
-		key := a.config.APIKey
+	if a.config.GroqAPIKey != "" {
+		key := a.config.GroqAPIKey
 		if len(key) > 4 {
 			key = "****" + key[len(key)-4:]
 		}
-		conf["api_key"] = key
+		conf["groq_api_key"] = key
 	} else {
-		conf["api_key"] = ""
+		conf["groq_api_key"] = ""
+	}
+	if a.config.MistralAPIKey != "" {
+		key := a.config.MistralAPIKey
+		if len(key) > 4 {
+			key = "****" + key[len(key)-4:]
+		}
+		conf["mistral_api_key"] = key
+	} else {
+		conf["mistral_api_key"] = ""
 	}
 	conf["shortcut"] = a.config.Shortcut
 	conf["whisper_model"] = a.config.WhisperModel
@@ -459,12 +472,18 @@ func (a *App) GetSettings() map[string]interface{} {
 
 // SaveSettings updates the configuration
 func (a *App) SaveSettings(settings map[string]interface{}) string {
-	if val, ok := settings["api_key"].(string); ok {
+	if val, ok := settings["groq_api_key"].(string); ok {
 		// Only update the API key if it's not the masked value returned by GetSettings.
 		// GetSettings masks the key as "****abcd" so the frontend can show the last 4 chars.
 		// If the user didn't change it and sent back the masked value, preserve the real key.
 		if !strings.HasPrefix(val, "****") {
-			a.config.APIKey = val
+			a.config.GroqAPIKey = val
+		}
+	}
+	if val, ok := settings["mistral_api_key"].(string); ok {
+		// Only update the API key if it's not the masked value returned by GetSettings.
+		if !strings.HasPrefix(val, "****") {
+			a.config.MistralAPIKey = val
 		}
 	}
 	if val, ok := settings["shortcut"].(string); ok {
@@ -520,10 +539,10 @@ func (a *App) SaveSettings(settings map[string]interface{}) string {
 	}
 
 	// Re-init transcriber with new settings.
-	// Note: a.config.APIKey is already updated by the api_key field above.
+	// Note: a.config.GroqAPIKey is already updated by the api_key field above.
 	// Since GetSettings masks the key, we only update if it's not still the masked value.
 	a.transcriber = transcriber.NewClient(
-		a.config.APIKey,
+		a.config.GroqAPIKey,
 		a.config.WhisperModel,
 		a.config.AIModel,
 		a.config.AIPrompt,
@@ -613,7 +632,8 @@ func (a *App) startupHeadless() {
 
 	// Initialize transcriber
 	a.transcriber = transcriber.NewClient(
-		a.config.APIKey,
+		a.config.GroqAPIKey,
+		a.config.MistralAPIKey,
 		a.config.WhisperModel,
 		a.config.AIModel,
 		a.config.AIPrompt,

frontend/index.html

@@ -24,19 +24,48 @@
 
             <div class="section-group-label">Authentication</div>
 
-            <!-- API Key -->
+            <!-- API Keys Dropdown Section -->
             <div class="section">
-                <label>Groq API Key</label>
-                <div class="form-control">
-                    <div class="flex-row">
-                        <div class="input-wrapper">
-                            <input type="password" id="apiKey" placeholder="gsk_...">
-                            <button class="eye-btn" onclick="toggleApiKey()" id="eyeBtn">👁️</button>
+                <details class="api-keys-details">
+                    <summary class="api-keys-summary">
+                        <span>API Keys</span>
+                        <span id="apiKeysStatus" style="color: var(--text-2); font-size: 12px; margin-left: 8px;">
+                            <span id="groqKeyStatus">No Groq key</span> | <span id="mistralKeyStatus">No Mistral key</span>
+                        </span>
+                    </summary>
+                    
+                    <div class="api-keys-content">
+                        <!-- Groq API Key -->
+                        <div class="api-key-section">
+                            <label style="margin-top: 12px; margin-bottom: 8px; display: block;">Groq API Key</label>
+                            <div class="form-control">
+                                <div class="flex-row">
+                                    <div class="input-wrapper">
+                                        <input type="password" id="groqApiKey" placeholder="gsk_...">
+                                        <button class="eye-btn" onclick="toggleGroqApiKey()" id="groqEyeBtn">👁️</button>
+                                    </div>
+                                    <button onclick="saveGroqApiKey()">Save</button>
+                                </div>
+                            </div>
+                            <p class="hint">Get your free key at <a href="#" onclick="window.runtime.BrowserOpenURL('https://console.groq.com/keys'); return false;" style="color: var(--accent);">console.groq.com/keys</a></p>
+                        </div>
+
+                        <!-- Mistral API Key -->
+                        <div class="api-key-section">
+                            <label style="margin-top: 12px; margin-bottom: 8px; display: block;">Mistral API Key</label>
+                            <div class="form-control">
+                                <div class="flex-row">
+                                    <div class="input-wrapper">
+                                        <input type="password" id="mistralApiKey" placeholder="mx_...">
+                                        <button class="eye-btn" onclick="toggleMistralApiKey()" id="mistralEyeBtn">👁️</button>
+                                    </div>
+                                    <button onclick="saveMistralApiKey()">Save</button>
+                                </div>
+                            </div>
+                            <p class="hint">Get your key at <a href="#" onclick="window.runtime.BrowserOpenURL('https://console.mistral.ai/api-keys'); return false;" style="color: var(--accent);">console.mistral.ai/api-keys</a></p>
                         </div>
-                        <button onclick="saveApiKey()">Save</button>
                     </div>
-                </div>
-                <p class="hint">Get your free key at <a href="#" onclick="window.runtime.BrowserOpenURL('https://console.groq.com/keys'); return false;" style="color: var(--accent);">console.groq.com/keys</a></p>
+                </details>
             </div>
 
             <!-- Global Hotkey (hidden on Linux because Linux uses the system shortcut command below) -->
@@ -74,8 +103,8 @@
                             <button onclick="copyLinuxPressCommand()">Copy</button>
                         </div>
                     </div>
-                    <p class="hint" style="margin-top: 10px;">GNOME: Settings → Keyboard → Custom Shortcuts → Add a shortcut with the copied command.</p>
-                    <p class="hint">KDE: System Settings → Shortcuts → Command/URL → Add a shortcut with the copied command.</p>
+                    <p class="hint" style="margin-top: 10px;">GNOME: Settings  Keyboard  Custom Shortcuts  Add a shortcut with the copied command.</p>
+                    <p class="hint">KDE: System Settings  Shortcuts  Command/URL  Add a shortcut with the copied command.</p>
                 </details>
             </div>
 
@@ -93,8 +122,9 @@
             <div class="section">
                 <label>Whisper Model</label>
                 <select id="whisperModel" onchange="saveWhisperModel()" class="form-control">
-                    <option value="whisper-large-v3-turbo">whisper-large-v3-turbo (Recommended)</option>
-                    <option value="whisper-large-v3">whisper-large-v3</option>
+                    <option value="whisper-large-v3-turbo">Whisper Large v3 Turbo (Groq)</option>
+                    <option value="whisper-large-v3">Whisper Large v3 (Groq)</option>
+                    <option value="voxtral-small-latest">Voxtral Small (Mistral)</option>
                 </select>
             </div>
 
@@ -116,12 +146,14 @@
                 <label>AI Model</label>
                 <select id="aiModel" onchange="saveAiModel()" class="form-control">
                     <option value="None">None — skip refinement</option>
-                    <option value="openai/gpt-oss-120b-high">openai/gpt-oss-120b (high reasoning)</option>
-                    <option value="openai/gpt-oss-120b">openai/gpt-oss-120b (low reasoning)</option>
-                    <option value="openai/gpt-oss-20b-high">openai/gpt-oss-20b (high reasoning)</option>
-                    <option value="openai/gpt-oss-20b">openai/gpt-oss-20b (low reasoning)</option>
-                    <option value="llama-3.3-70b-versatile">llama-3.3-70b-versatile</option>
-                    <option value="llama-3.1-8b-instant">llama-3.1-8b-instant (faster)</option>
+                    <option value="openai/gpt-oss-120b-high">GPT OSS 120B High (Groq)</option>
+                    <option value="openai/gpt-oss-120b">GPT OSS 120B (Groq)</option>
+                    <option value="openai/gpt-oss-20b-high">GPT OSS 20B High (Groq)</option>
+                    <option value="openai/gpt-oss-20b">GPT OSS 20B (Groq)</option>
+                    <option value="llama-3.3-70b-versatile">Llama 3.3 70B Versatile (Groq)</option>
+                    <option value="llama-3.1-8b-instant">Llama 3.1 8B Instant (Groq)</option>
+                    <option value="mistral-small-latest">Mistral Small (Mistral)</option>
+                    <option value="mistral-medium-latest">Mistral Medium (Mistral)</option>
                 </select>
             </div>
 
@@ -189,7 +221,7 @@
 
                     <div id="whisperInstalled" style="display: none;">
                         <div style="background: var(--green-dim); border: 1px solid rgba(61, 186, 110, 0.25); border-radius: 7px; padding: 13px 16px; margin-bottom: 14px;">
-                            <div style="color: var(--green); font-weight: 500; font-size: 13px;">✓ Offline Whisper installed</div>
+                            <div style="color: var(--green); font-weight: 500; font-size: 13px;"> Offline Whisper installed</div>
                             <div style="font-size: 12px; color: var(--text-2); margin-top: 4px;">
                                 Model: <span id="installedModel">—</span>
                             </div>
@@ -208,18 +240,56 @@
     </div>
 
     <script type="module">
-        let apiKeyVisible = false;
+        let groqApiKeyVisible = false;
+        let mistralApiKeyVisible = false;
         let linuxShortcutMode = false;
 
-        // Toggle API key visibility
-        window.toggleApiKey = function () {
-            const input = document.getElementById('apiKey');
-            const btn = document.getElementById('eyeBtn');
-            apiKeyVisible = !apiKeyVisible;
-            input.type = apiKeyVisible ? 'text' : 'password';
-            btn.textContent = apiKeyVisible ? '🙈' : '👁️';
+        // Toggle Groq API key visibility
+        window.toggleGroqApiKey = function () {
+            const input = document.getElementById('groqApiKey');
+            const btn = document.getElementById('groqEyeBtn');
+            groqApiKeyVisible = !groqApiKeyVisible;
+            input.type = groqApiKeyVisible ? 'text' : 'password';
+            btn.textContent = groqApiKeyVisible ? '👁️' : '👁️';
         };
 
+        // Toggle Mistral API key visibility
+        window.toggleMistralApiKey = function () {
+            const input = document.getElementById('mistralApiKey');
+            const btn = document.getElementById('mistralEyeBtn');
+            mistralApiKeyVisible = !mistralApiKeyVisible;
+            input.type = mistralApiKeyVisible ? 'text' : 'password';
+            btn.textContent = mistralApiKeyVisible ? '👁️' : '👁️';
+        };
+
+        // Save Groq API key
+        window.saveGroqApiKey = async function () {
+            const key = document.getElementById('groqApiKey').value.trim();
+            await window.go.main.App.SaveSettings({ groq_api_key: key });
+            showSaveStatus();
+            updateApiKeyStatus();
+        };
+
+        // Save Mistral API key
+        window.saveMistralApiKey = async function () {
+            const key = document.getElementById('mistralApiKey').value.trim();
+            await window.go.main.App.SaveSettings({ mistral_api_key: key });
+            showSaveStatus();
+            updateApiKeyStatus();
+        };
+
+        // Update API key status display
+        function updateApiKeyStatus() {
+            const groqKey = document.getElementById('groqApiKey').value;
+            const mistralKey = document.getElementById('mistralApiKey').value;
+            
+            const groqStatus = document.getElementById('groqKeyStatus');
+            const mistralStatus = document.getElementById('mistralKeyStatus');
+            
+            groqStatus.textContent = groqKey ? (groqKey.length > 4 ? 'Groq key set' : 'Groq key') : 'No Groq key';
+            mistralStatus.textContent = mistralKey ? (mistralKey.length > 4 ? 'Mistral key set' : 'Mistral key') : 'No Mistral key';
+        }
+
         // Record shortcut
         window.recordShortcut = function () {
             if (linuxShortcutMode) {
@@ -397,7 +467,8 @@
             try {
                 const settings = await window.go.main.App.GetSettings();
 
-                document.getElementById('apiKey').value = settings.api_key || '';
+                document.getElementById('groqApiKey').value = settings.groq_api_key || '';
+                document.getElementById('mistralApiKey').value = settings.mistral_api_key || '';
                 const shortcutInput = document.getElementById('shortcutInput');
                 if (shortcutInput) {
                     shortcutInput.value = settings.shortcut || 'alt+z';
@@ -434,6 +505,7 @@
                 document.getElementById('appVersion').textContent = ver === 'dev' ? 'dev' : ('v' + ver);
 
                 renderHistoryList(settings.history || []);
+                updateApiKeyStatus();
             } catch (err) {
                 console.error("Failed to load settings:", err);
             }
@@ -457,13 +529,6 @@
             }
         }
 
-        // Save functions
-        window.saveApiKey = async function () {
-            const key = document.getElementById('apiKey').value.trim();
-            await window.go.main.App.SaveSettings({ api_key: key });
-            showSaveStatus();
-        };
-
         function showSaveStatus(message = 'Saved') {
             const el = document.getElementById('saveStatus');
             el.textContent = message;
@@ -540,7 +605,7 @@
                     statusEl.style.color = 'var(--green)';
                     statusEl.style.border = '1px solid rgba(61, 186, 110, 0.2)';
                 } else {
-                    statusEl.innerHTML = '● Offline — install local Whisper for transcription';
+                    statusEl.innerHTML = '● Offline \u2014 install local Whisper for transcription';
                     statusEl.style.background = 'var(--red-dim)';
                     statusEl.style.color = 'var(--red)';
                     statusEl.style.border = '1px solid rgba(224, 82, 82, 0.2)';
@@ -580,7 +645,7 @@
                     // Add local option to whisper dropdown
                     const localOption = document.createElement('option');
                     localOption.value = 'local-' + info.model;
-                    localOption.textContent = '⬡ Local — ' + info.model + ' (offline)';
+                    localOption.textContent = '↑ Local \u2014 ' + info.model + ' (offline)';
                     localOption.style.fontWeight = 'bold';
                     whisperSelect.insertBefore(localOption, whisperSelect.firstChild);
                 } else {

frontend/src/style.css

@@ -18,6 +18,8 @@
     --red-dim:      rgba(224, 82, 82, 0.12);
     --radius:       10px;
     --radius-sm:    7px;
+    --mistral:      #8a5cf0;
+    --mistral-dim:  rgba(138, 92, 240, 0.15);
     color-scheme: dark;
 }
 
@@ -35,14 +37,14 @@ body {
     -webkit-font-smoothing: antialiased;
 }
 
-/* ── Layout ── */
+/* Layout */
 .container {
     max-width: 680px;
     margin: 0 auto;
     padding: 32px 28px 60px;
 }
 
-/* ── Header ── */
+/* Header */
 h1 {
     font-size: 20px;
     font-weight: 600;
@@ -64,7 +66,7 @@ h1 {
     flex-wrap: nowrap;
 }
 
-/* ── Section cards ── */
+/* Section cards */
 .section {
     background: var(--surface);
     border: 1px solid var(--border);
@@ -78,7 +80,7 @@ h1 {
     border-color: var(--border-hover);
 }
 
-/* ── Labels ── */
+/* Labels */
 label {
     display: block;
     font-size: 13px;
@@ -96,7 +98,7 @@ label {
     line-height: 1.5;
 }
 
-/* ── Inputs ── */
+/* Inputs */
 input[type="text"],
 input[type="password"],
 select,
@@ -157,12 +159,12 @@ input[type="checkbox"] {
     flex-shrink: 0;
 }
 
-/* ── Form control width ── */
+/* Form control width */
 .form-control {
     width: 100%;
 }
 
-/* ── Input wrapper (for eye-btn) ── */
+/* Input wrapper (for eye-btn) */
 .input-wrapper {
     position: relative;
     flex: 1;
@@ -197,7 +199,7 @@ input[type="checkbox"] {
     box-shadow: none !important;
 }
 
-/* ── Buttons ── */
+/* Buttons */
 button {
     background: var(--accent);
     color: #fff;
@@ -254,7 +256,7 @@ button:active {
     opacity: 1 !important;
 }
 
-/* ── Save status toast ── */
+/* Save status toast */
 .save-status {
     position: fixed;
     bottom: 24px;
@@ -279,7 +281,7 @@ button:active {
     opacity: 1;
 }
 
-/* ── History ── */
+/* History */
 .history-list {
     max-height: 240px;
     overflow-y: auto;
@@ -308,7 +310,7 @@ button:active {
     display: block;
 }
 
-/* ── Inline status badges (online/offline) ── */
+/* Inline status badges (online/offline) */
 #connectionStatus {
     border-radius: var(--radius-sm) !important;
     font-size: 13px !important;
@@ -333,16 +335,95 @@ button:active {
     background: var(--accent-hover) !important;
 }
 
-/* ── Offline Whisper section separator ── */
+/* Offline Whisper section separator */
 #offlineWhisperSection {
     border-top: 1px solid var(--border) !important;
     margin-top: 20px !important;
     padding-top: 20px !important;
 }
 
+/* API Keys Dropdown Section */
+.api-keys-details {
+    color: var(--text);
+}
 
+.api-keys-summary {
+    cursor: pointer;
+    font-weight: 500;
+    font-size: 13px;
+    color: var(--text);
+    padding: 2px 0;
+    user-select: none;
+    list-style: none;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    width: 100%;
+}
 
-/* ── Collapsible fallback details ── */
+.api-keys-summary::-webkit-details-marker {
+    display: none;
+}
+
+.api-keys-summary::after {
+    content: '\u25b6';
+    font-size: 10px;
+    color: var(--text-3);
+    transition: transform 0.15s ease;
+    display: inline-block;
+    margin-left: 8px;
+}
+
+.api-keys-details[open] > .api-keys-summary::after {
+    transform: rotate(90deg);
+}
+
+.api-keys-summary:hover {
+    color: var(--text);
+}
+
+.api-keys-content {
+    margin-top: 12px;
+    padding-top: 12px;
+    border-top: 1px solid var(--border);
+}
+
+.api-key-section {
+    margin-bottom: 12px;
+}
+
+.api-key-section:last-child {
+    margin-bottom: 0;
+}
+
+/* Provider badges for model options */
+select option[data-provider]::before {
+    content: attr(data-provider);
+    display: inline-block;
+    padding: 2px 6px;
+    border-radius: 4px;
+    font-size: 11px;
+    font-weight: 500;
+    margin-right: 8px;
+    opacity: 0.8;
+}
+
+select option[data-provider="groq"]::before {
+    background: var(--accent-dim);
+    color: var(--accent);
+}
+
+select option[data-provider="mistral"]::before {
+    background: var(--mistral-dim);
+    color: var(--mistral);
+}
+
+select option[data-provider="local"]::before {
+    background: var(--green-dim);
+    color: var(--green);
+}
+
+/* Collapsible fallback details */
 .fallback-details {
     color: var(--text);
 }
@@ -365,7 +446,7 @@ button:active {
 }
 
 .fallback-summary::before {
-    content: '▶';
+    content: '\u25b6';
     font-size: 10px;
     color: var(--text-3);
     transition: transform 0.15s ease;
@@ -380,7 +461,7 @@ button:active {
     color: var(--text);
 }
 
-/* ── Section group header divider ── */
+/* Section group header divider */
 .section-group-label {
     font-size: 11px;
     font-weight: 600;
@@ -390,11 +471,11 @@ button:active {
     margin: 22px 0 8px;
 }
 
-/* ── Scrollbar ── */
+/* Scrollbar */
 ::-webkit-scrollbar { width: 5px; }
 ::-webkit-scrollbar-track { background: transparent; }
 ::-webkit-scrollbar-thumb {
     background: var(--surface-2);
     border-radius: 10px;
 }
-::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }
+::-webkit-scrollbar-thumb:hover { background: var(--border-hover); }

internal/config/config.go

@@ -31,7 +31,8 @@ type HistoryItem struct {
 // Config represents the complete application configuration.
 type Config struct {
 	Version          int           `json:"version"`
-	APIKey           string        `json:"api_key"`
+	GroqAPIKey       string        `json:"groq_api_key"`
+	MistralAPIKey    string        `json:"mistral_api_key"`
 	Shortcut         string        `json:"shortcut"`
 	WhisperModel     string        `json:"whisper_model"`
 	AIModel          string        `json:"ai_model"`
@@ -50,7 +51,8 @@ var saveMu sync.Mutex
 // DefaultConfig returns a new configuration with sensible default values.
 func DefaultConfig() *Config {
 	return &Config{
-		APIKey:           "",
+		GroqAPIKey:       "",
+		MistralAPIKey:    "",
 		Shortcut:         DefaultShortcut,
 		WhisperModel:     DefaultWhisperModel,
 		AIModel:          DefaultAIModel,
@@ -197,3 +199,25 @@ func (c *Config) AddHistoryItem(text, timestamp string) {
 func (c *Config) ClearHistory() {
 	c.History = []HistoryItem{}
 }
+
+// GetAPIKey returns the API key for a specific provider
+func (c *Config) GetAPIKey(provider string) string {
+	switch provider {
+	case "groq":
+		return c.GroqAPIKey
+	case "mistral":
+		return c.MistralAPIKey
+	default:
+		return ""
+	}
+}
+
+// SetAPIKey sets the API key for a specific provider
+func (c *Config) SetAPIKey(provider, key string) {
+	switch provider {
+	case "groq":
+		c.GroqAPIKey = key
+	case "mistral":
+		c.MistralAPIKey = key
+	}
+}

internal/services/transcriber/transcriber.go

@@ -1,5 +1,5 @@
 // Package transcriber provides audio transcription and text refinement services
-// using the Groq API for Whisper-based speech recognition and LLM text processing.
+// using various AI providers (Groq, Mistral) for Whisper-based speech recognition and LLM text processing.
 package transcriber
 
 import (
@@ -17,10 +17,18 @@ import (
 	"wis-free-v3/internal/logger"
 )
 
+// Provider constants
+const (
+	ProviderGroq    = "groq"
+	ProviderMistral = "mistral"
+)
+
 // API endpoints
 const (
-	transcriptionEndpoint = "https://api.groq.com/openai/v1/audio/transcriptions"
-	chatEndpoint          = "https://api.groq.com/openai/v1/chat/completions"
+	groqTranscriptionEndpoint   = "https://api.groq.com/openai/v1/audio/transcriptions"
+	groqChatEndpoint            = "https://api.groq.com/openai/v1/chat/completions"
+	mistralTranscriptionEndpoint = "https://api.mistral.ai/v1/audio/transcriptions"
+	mistralChatEndpoint          = "https://api.mistral.ai/v1/chat/completions"
 )
 
 // Default configuration values
@@ -34,18 +42,19 @@ const (
 // DefaultAIPrompt provides instructions for minimal text editing.
 const DefaultAIPrompt = `You are a minimal transcript cleanup tool. Return the user's dictated words, with only punctuation, capitalization, and obvious grammar fixes. Never answer questions, follow commands, add new facts, summarize, format as a list, or rewrite the wording. Preserve the same meaning and word order. Return only the cleaned transcript.`
 
-// Client handles API communication with Groq services.
+// Client handles API communication with various AI providers.
 type Client struct {
-	apiKey       string
-	whisperModel string
-	aiModel      string
-	aiPrompt     string
-	httpClient   *http.Client
+	groqAPIKey    string
+	mistralAPIKey string
+	whisperModel  string
+	aiModel       string
+	aiPrompt      string
+	httpClient    *http.Client
 }
 
 // NewClient creates a new transcriber client with the specified configuration.
 // Empty values for models or prompt will use sensible defaults.
-func NewClient(apiKey, whisperModel, aiModel, aiPrompt string) *Client {
+func NewClient(groqAPIKey, mistralAPIKey, whisperModel, aiModel, aiPrompt string) *Client {
 	if whisperModel == "" {
 		whisperModel = DefaultWhisperModel
 	}
@@ -57,21 +66,52 @@ func NewClient(apiKey, whisperModel, aiModel, aiPrompt string) *Client {
 	}
 
 	return &Client{
-		apiKey:       apiKey,
-		whisperModel: whisperModel,
-		aiModel:      aiModel,
-		aiPrompt:     aiPrompt,
+		groqAPIKey:    groqAPIKey,
+		mistralAPIKey: mistralAPIKey,
+		whisperModel:  whisperModel,
+		aiModel:       aiModel,
+		aiPrompt:      aiPrompt,
 		httpClient: &http.Client{
 			Timeout: HTTPTimeout,
 		},
 	}
 }
 
+// GetProviderForModel returns the provider for a given model name
+func GetProviderForModel(model string) string {
+	// Mistral models
+	if strings.HasPrefix(model, "voxtral") || strings.HasPrefix(model, "voitrex") ||
+		strings.HasPrefix(model, "mistral-") ||
+		strings.Contains(model, "mistral") {
+		return ProviderMistral
+	}
+	// Groq models (default)
+	return ProviderGroq
+}
+
+// GetAPIKeyForModel returns the appropriate API key for a given model
+func (c *Client) GetAPIKeyForModel(model string) string {
+	provider := GetProviderForModel(model)
+	if provider == ProviderMistral {
+		return c.mistralAPIKey
+	}
+	return c.groqAPIKey
+}
+
 // TranscribeAudio converts an audio file to text using Whisper.
 // Returns the transcribed text or an error if the operation fails.
 func (c *Client) TranscribeAudio(audioFilePath, language string) (string, error) {
-	if c.apiKey == "" {
-		return "", fmt.Errorf("API key is missing - please configure it in Settings")
+	// Check if using local whisper
+	isLocal := strings.HasPrefix(c.whisperModel, "local-")
+	if isLocal {
+		return "", fmt.Errorf("local whisper should be handled separately")
+	}
+
+	// Get the appropriate API key for the model
+	apiKey := c.GetAPIKeyForModel(c.whisperModel)
+	if apiKey == "" {
+		provider := GetProviderForModel(c.whisperModel)
+		return "", fmt.Errorf("API key is missing for %s provider - please configure it in Settings", provider)
 	}
 
 	// Validate file exists and get size for logging
@@ -87,12 +127,19 @@ func (c *Client) TranscribeAudio(audioFilePath, language string) (string, error)
 		return "", err
 	}
 
+	// Determine which endpoint to use based on the model
+	provider := GetProviderForModel(c.whisperModel)
+	endpoint := groqTranscriptionEndpoint
+	if provider == ProviderMistral {
+		endpoint = mistralTranscriptionEndpoint
+	}
+
 	// Create and send request
-	req, err := http.NewRequest(http.MethodPost, transcriptionEndpoint, body)
+	req, err := http.NewRequest(http.MethodPost, endpoint, body)
 	if err != nil {
 		return "", fmt.Errorf("failed to create request: %w", err)
 	}
-	req.Header.Set("Authorization", "Bearer "+c.apiKey)
+	req.Header.Set("Authorization", "Bearer "+apiKey)
 	req.Header.Set("Content-Type", contentType)
 
 	resp, err := c.httpClient.Do(req)
@@ -103,7 +150,7 @@ func (c *Client) TranscribeAudio(audioFilePath, language string) (string, error)
 
 	// Handle response
 	if resp.StatusCode != http.StatusOK {
-		return "", c.handleAPIError(resp, "transcription")
+		return "", c.handleAPIError(resp, "transcription", provider)
 	}
 
 	var result struct {
@@ -120,7 +167,15 @@ func (c *Client) TranscribeAudio(audioFilePath, language string) (string, error)
 // RefineText uses an LLM to clean up and correct transcribed text.
 // If the AI model is set to "None" or the API key is missing, returns the original text.
 func (c *Client) RefineText(text string, activeContext string) (string, error) {
-	if c.apiKey == "" || c.aiModel == "None" {
+	if c.aiModel == "None" {
+		return text, nil
+	}
+
+	// Get the appropriate API key for the AI model
+	apiKey := c.GetAPIKeyForModel(c.aiModel)
+	if apiKey == "" {
+		provider := GetProviderForModel(c.aiModel)
+		logger.Error("API key missing for %s provider - skipping refinement", provider)
 		return text, nil
 	}
 
@@ -165,12 +220,19 @@ func (c *Client) RefineText(text string, activeContext string) (string, error) {
 		return text, nil // Return original text on error
 	}
 
-	req, err := http.NewRequest(http.MethodPost, chatEndpoint, bytes.NewBuffer(payloadBytes))
+	// Determine which endpoint to use based on the AI model
+	provider := GetProviderForModel(c.aiModel)
+	endpoint := groqChatEndpoint
+	if provider == ProviderMistral {
+		endpoint = mistralChatEndpoint
+	}
+
+	req, err := http.NewRequest(http.MethodPost, endpoint, bytes.NewBuffer(payloadBytes))
 	if err != nil {
 		logger.Error("Failed to create refinement request: %v", err)
 		return text, nil
 	}
-	req.Header.Set("Authorization", "Bearer "+c.apiKey)
+	req.Header.Set("Authorization", "Bearer "+apiKey)
 	req.Header.Set("Content-Type", "application/json")
 
 	resp, err := c.httpClient.Do(req)
@@ -181,7 +243,7 @@ func (c *Client) RefineText(text string, activeContext string) (string, error) {
 	defer resp.Body.Close()
 
 	if resp.StatusCode != http.StatusOK {
-		c.handleAPIError(resp, "refinement")
+		c.handleAPIError(resp, "refinement", provider)
 		return text, nil
 	}
 
@@ -325,13 +387,13 @@ func (c *Client) prepareAudioRequest(audioFilePath, language string) (*bytes.Buf
 
 // handleAPIError logs and formats API error responses.
 // Truncates the body to avoid leaking secrets if the API echoes request data.
-func (c *Client) handleAPIError(resp *http.Response, operation string) error {
+func (c *Client) handleAPIError(resp *http.Response, operation string, provider string) error {
 	bodyBytes, _ := io.ReadAll(resp.Body)
 	const maxLogLen = 200
 	bodyStr := string(bodyBytes)
 	if len(bodyStr) > maxLogLen {
 		bodyStr = bodyStr[:maxLogLen] + "...(truncated)"
 	}
-	logger.Error("API %s error: status=%d body=%s", operation, resp.StatusCode, bodyStr)
+	logger.Error("API %s error (%s): status=%d body=%s", operation, provider, resp.StatusCode, bodyStr)
 	return fmt.Errorf("%s failed with status %d", operation, resp.StatusCode)
 }