Add Gladia as a multilingual transcriber option (#668)

Co-authored-by: Cursor Agent <[email protected]>
Co-authored-by: sahil <[email protected]>

Author: 3 people

fern/customization/multilingual.mdx

@@ -16,7 +16,7 @@ Configure your voice assistant to communicate in multiple languages with automat
 - Test and optimize multilingual performance
 
 <Note>
-**Multilingual Support:** Multiple providers support automatic language detection. **Deepgram** (Nova 2, Nova 3 with "Multi" setting) and **Google STT** (with "Multilingual" setting) both offer automatic language detection for seamless multilingual conversations.
+**Multilingual Support:** Multiple providers support automatic language detection. **Deepgram** (Nova 2, Nova 3 with "Multi" setting), **Google STT** (with "Multilingual" setting), and **Gladia** (automatic language detection) all offer seamless multilingual conversations.
 </Note>
 
 ## Configure automatic language detection
@@ -28,10 +28,10 @@ Set up your transcriber to automatically detect and process multiple languages.
     1. Navigate to **Assistants** in your [Vapi Dashboard](https://dashboard.vapi.ai/)
     2. Create a new assistant or edit an existing one
     3. In the **Transcriber** section:
-       - **Provider**: Select `Deepgram` (recommended) or `Google`
-       - **Model**: For Deepgram, choose `Nova 2` or `Nova 3`; for Google, choose `Latest`
-       - **Language**: Set to `Multi` (Deepgram) or `Multilingual` (Google)
-    4. **Other providers**: Single language only, no automatic detection
+       - **Provider**: Select `Deepgram` (recommended), `Google`, or `Gladia`
+       - **Model**: For Deepgram, choose `Nova 2` or `Nova 3`; for Google, choose `Latest`; for Gladia, choose your preferred Gladia model
+       - **Language / Mode**: Set `Multi` (Deepgram), `Multilingual` (Google), or enable automatic language detection (Gladia)
+    4. **Other providers**: May require a single language and not auto-detect
     5. Click **Save** to apply the configuration
   </Tab>
   <Tab title="TypeScript (Server SDK)">
@@ -114,7 +114,7 @@ Set up your transcriber to automatically detect and process multiple languages.
 </Tabs>
 
 <Note>
-**Provider Performance:** **Deepgram** offers the best balance of speed and multilingual accuracy. **Google** provides broader language support but may be slower. Both providers support automatic language detection within conversations.
+**Provider Performance:** **Deepgram** offers the best balance of speed and multilingual accuracy. **Google** provides broader language support but may be slower. **Gladia** offers excellent automatic language recognition and code-switching with strong accuracy reported by customers. All three support automatic language detection within conversations.
 </Note>
 
 ## Set up multilingual voices
@@ -463,7 +463,7 @@ Validate your configuration with different languages and scenarios.
 | **Assembly AI** | ❌ English only | English | No multilingual support |
 | **Azure STT** | ❌ Single language | 100+ | Many languages, but no auto-detection |
 | **OpenAI Whisper** | ❌ Single language | 90+ | Many languages, but no auto-detection |
-| **Gladia** | ❌ Single language | 80+ | Many languages, but no auto-detection |
+| **Gladia** | ✅ Full auto-detection | 90+ | Supports automatic language detection and code-switching |
 | **Speechmatics** | ❌ Single language | 50+ | Many languages, but no auto-detection |
 | **Talkscriber** | ❌ Single language | 40+ | Many languages, but no auto-detection |
 
@@ -481,7 +481,7 @@ Validate your configuration with different languages and scenarios.
 <AccordionGroup>
   <Accordion title="Language detection is inaccurate">
     **Solutions:**
-    - Use Deepgram (Nova 2/Nova 3 with "Multi") or Google STT (with "Multilingual")
+    - Use Deepgram (Nova 2/Nova 3 with "Multi"), Google STT (with "Multilingual"), or Gladia (automatic language detection)
     - Ensure high-quality audio input for better detection accuracy
     - Test with native speakers of target languages
     - Consider provider-specific language combinations for optimal results

fern/providers/transcriber/gladia.mdx

@@ -21,7 +21,7 @@ Gladia provides a comprehensive suite of AI-driven tools:
 
 **Speech-to-Text:**
 
-Gladia’s core offering is its AI-powered speech-to-text technology, delivering highly accurate and real-time transcription. This service supports 99 languages and includes speaker diarization and code-switching.
+Gladia’s core offering is its AI-powered speech-to-text technology, delivering highly accurate and real-time transcription. This service supports automatic language detection (including code‑switching within a conversation) and 90+ languages, and includes speaker diarization.
 
 **Audio Intelligence:**
 
@@ -54,8 +54,9 @@ Gladia excels in providing real-time transcription and translation:
 
 **Multilingual Support:**
 
-- 99 Languages: Supports a wide range of languages and dialects.
-- Real-time Translation: Near-instantaneous translation for diverse applications.
+- Automatic language recognition: Detects the spoken language automatically and handles code‑switching
+- 90+ languages: Supports a wide range of languages and dialects
+- Real-time Translation: Near-instantaneous translation for diverse applications
 
 **Use Cases:**