Grok Speech (STT + TTS APIs) vs Lyria 3 Pro (Google)
Which one should you pick? Here's the full breakdown.
Grok Speech (STT + TTS APIs)
xAI's standalone voice APIs -- launched 2026-04-17. Built on the stack that powers Grok Voice, Tesla vehicles, and Starlink customer support. $0.10/hr STT batch, $4.20 per 1M characters TTS, 25+ languages, word-level timestamps + speaker diarization
Lyria 3 Pro (Google)
Google DeepMind's music generation model -- 3-minute structured songs with intro, verse, chorus, and outro control
| Category | Grok Speech (STT + TTS APIs) | Lyria 3 Pro (Google) |
|---|---|---|
| Ease of Use | 7.0 | 8.0 |
| Output Quality | 8.5 | 8.0 |
| Value | 9.0 | 7.0 |
| Features | 8.0 | 8.0 |
| Overall | 8.1 | 7.8 |
Pricing Comparison
| Feature | Grok Speech (STT + TTS APIs) | Lyria 3 Pro (Google) |
|---|---|---|
| Free Tier | No | Yes |
| Starting Price | $0.10 | $0 |
Which Should You Pick?
Pick Grok Speech (STT + TTS APIs) if...
- ✓Better value for money (9/10)
Developers building voice agents, real-time transcription tools, accessibility features, or high-volume TTS workloads where the cost per hour of audio actually matters at scale. Strong fit for phone-call and meeting transcription use cases where xAI's published WER advantage (5.0% on phone-call entities vs. ElevenLabs 12.0%) compounds quickly.
Visit Grok Speech (STT + TTS APIs)Pick Lyria 3 Pro (Google) if...
- ✓Easier to use (8 vs 7)
- ✓Has a free tier
Content creators who already pay for a Gemini or Google AI subscription and want longer, more structured AI music. Also great for developers building music features into their own apps via the $0.08/song API.
Visit Lyria 3 Pro (Google)Our Verdict
Grok Speech (STT + TTS APIs) and Lyria 3 Pro (Google) are extremely close overall. Your choice comes down to specific needs -- Grok Speech (STT + TTS APIs) is better for developers building voice agents, real-time transcription tools, accessibility features, or high-volume tts workloads where the cost per hour of audio actually matters at scale, while Lyria 3 Pro (Google) works best for content creators who already pay for a gemini or google ai subscription and want longer, more structured ai music.