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Best text-to-speech API for voice agents

3 models · updated 2026-06-29

The verdict

ElevenLabs leads — 2 of 3 models rank ElevenLabs the top startup.

Not unanimous: ChatGPT picks Cartesia Sonic.

Combined ranking

  1. 1
    ElevenLabs—14 pts
    GPT #2Claude #1Gemini #1· Industry-leading voice quality with low-latency Flash models and a purpose-built Conversational AI/agents stack.
  2. 2
    Cartesia—8 pts
    GPT —Claude #2Gemini #2· Sonic models deliver ultra-low latency streaming ideal for real-time voice agents.
  3. 3
    Deepgram—5 pts
    GPT —Claude #3Gemini #4· Aura TTS pairs tightly with their STT for a fast, unified voice-agent pipeline.
  4. 4
    Cartesia Sonic—5 pts
    GPT #1Claude —Gemini —· Lowest-latency streaming TTS built for real-time agents.
  5. 5
    PlayHT—4 pts
    GPT —Claude #5Gemini #3· Large library of realistic voices and low-latency streaming endpoints.
  6. 6
    Deepgram Aura—2 pts
    GPT #4Claude —Gemini —· Fast, affordable streaming TTS that pairs well with STT.
  7. 7
    Hume AI—1 pts
    GPT —Claude —Gemini #5· Empathic voice design optimized for emotional resonance and intelligence.
  8. 8
    Rime Arcana—1 pts
    GPT #5Claude —Gemini —· Natural conversational voices with strong developer controls.

Not ranked (incumbents): OpenAI gpt-4o-mini-tts, OpenAI

By model

ChatGPT

  1. 1.Cartesia Sonic
  2. 2.ElevenLabs
  3. 3.OpenAI gpt-4o-mini-tts
  4. 4.Deepgram Aura
  5. 5.Rime Arcana

Claude

  1. 1.ElevenLabs
  2. 2.Cartesia
  3. 3.Deepgram
  4. 4.OpenAI
  5. 5.PlayHT

Gemini

  1. 1.ElevenLabs
  2. 2.Cartesia
  3. 3.PlayHT
  4. 4.Deepgram
  5. 5.Hume AI

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously