Best Grok Speech (STT + TTS APIs) Alternatives in 2026
Grok Speech (STT + TTS APIs) scores 8.1/10 on our tests. Here are 6 alternatives worth considering in the AI Voice & Audio space.
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
Top Alternatives, Ranked
Best-in-class AI voice generation -- now includes 11.ai (MCP-based voice assistant), Eleven v3 expressive speech, and IBM watsonx partnership. $500M raise at $11B valuation (Feb 2026)
Cohere's first audio model -- launched 2026-03-26 under Apache 2.0, 2B parameters, #1 on Hugging Face Open ASR Leaderboard (5.42 avg WER), 14 enterprise-critical languages. Free API with rate limits; Model Vault for production
Microsoft's first in-house expressive TTS model -- launched 2026-04-02 on Azure Foundry. Generates 60s of audio in ~1s on a single GPU. Custom voice cloning from a few seconds of input. Powers Copilot, Bing, PowerPoint, and Azure Speech
Score Comparison
| Tool | Ease of Use | Output Quality | Value | Features | Overall |
|---|---|---|---|---|---|
| Grok Speech (STT + TTS APIs)(current) | 7.0 | 8.5 | 9.0 | 8.0 | 8.1 |
| ElevenLabs | 8.0 | 10.0 | 7.0 | 9.0 | 8.5 |
| Descript | 9.0 | 8.0 | 8.0 | 9.0 | 8.5 |
| Cohere Transcribe | 7.0 | 9.0 | 9.0 | 7.0 | 8.0 |
| Microsoft MAI-Voice-1 | 6.0 | 8.0 | 8.0 | 7.0 | 7.3 |
| Murf AI | 8.0 | 7.0 | 6.0 | 7.0 | 7.0 |
| Speechify | 8.0 | 7.0 | 5.0 | 7.0 | 6.8 |
Not sure which to pick?
Read our full reviews or use the comparison tool to see how they stack up head-to-head.