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provider-elevenlabs/tts (ElevenLabs Text-to-Speech)
You can run this example with:
npx promptfoo@latest init --example provider-elevenlabs/tts
cd provider-elevenlabs/tts
Test and compare ElevenLabs TTS models and voice settings.
What this tests
- Model comparison: Flash v2.5, Turbo v2.5, Multilingual v2
- Streaming vs. non-streaming performance
- Voice quality across different text inputs
- Cost and latency metrics
Setup
Set your ElevenLabs API key:
export ELEVENLABS_API_KEY=your_api_key_here
Run the example
npx promptfoo@latest eval -c ./promptfooconfig.yaml
Or view in the UI:
npx promptfoo@latest eval -c ./promptfooconfig.yaml
npx promptfoo@latest view
What to look for
- Model differences: Flash v2.5 has lowest latency (~200ms), Multilingual v2 best quality
- Streaming benefits: First chunk arrives in ~75ms for real-time feel
- Cost tracking: ~$0.02 per 1000 characters
- Audio metadata: Duration, size, format info in response
Available voices
This example uses Rachel (21m00Tcm4TlvDq8ikWAM). Try other popular voices:
- Rachel: Calm, clear female voice (default)
- Clyde: Warm, grounded male voice (2EiwWnXFnvU5JabPnv8n)
- Drew: Well-rounded male voice (29vD33N1CtxCmqQRPOHJ)
- Paul: Casual male voice (5Q0t7uMcjvnagumLfvZi)
Voice settings
Customize the voice output:
voiceSettings:
stability: 0.5 # 0 (more variable) to 1 (more stable)
similarity_boost: 0.75 # 0 (low) to 1 (high)
style: 0.0 # 0 to 1 (only for v2 models)
use_speaker_boost: true # Enhance clarity
speed: 1.0 # 0.25 to 4.0
Output formats
Available formats:
mp3_22050_32- Smallest size, lower qualitymp3_44100_128- Balanced (default)mp3_44100_192- High qualitypcm_16000- Raw PCM for processingpcm_44100- High quality PCMulaw_8000- Phone quality