{
  "publisher": "SpeechifyAI",
  "provenance": "SpeechifyAI's reading of OpenAI's, ElevenLabs', Deepgram's and Cartesia's own public documentation and pricing pages on 30 Sep 2026, for the alternatives guides. Quotes are verbatim from the page named in each entry's sources.",
  "capturedOn": "2026-09-30",
  "date": "30 Sep 2026",
  "currency": "USD, before tax",
  "openai": {
    "builtInVoices": [
      "alloy",
      "ash",
      "ballad",
      "coral",
      "echo",
      "fable",
      "nova",
      "onyx",
      "sage",
      "shimmer",
      "verse",
      "marin",
      "cedar"
    ],
    "customVoices": "Custom voices are limited to eligible customers. Contact our sales team to learn more.",
    "streaming": "The Speech API provides support for realtime audio streaming using chunk transfer encoding.",
    "gpt4oMiniTtsMaxInputTokens": 2000,
    "prices": {
      "gpt-4o-mini-tts": {
        "textInputPer1MTokens": 0.6,
        "audioOutputPer1MTokens": 12
      },
      "tts-1": {
        "per1MCharacters": 15
      },
      "tts-1-hd": {
        "per1MCharacters": 30
      }
    },
    "sources": [
      "https://developers.openai.com/api/docs/guides/text-to-speech",
      "https://developers.openai.com/api/docs/guides/custom-voices",
      "https://developers.openai.com/api/docs/models/gpt-4o-mini-tts",
      "https://developers.openai.com/api/docs/pricing"
    ]
  },
  "elevenlabs": {
    "pricesPer1KCharacters": {
      "Flash / Turbo": 0.04,
      "v2 Multilingual": 0.08,
      "v3": 0.08,
      "v4": {
        "list": 0.08,
        "promo": 0.022,
        "promoUntil": "2026-10-12"
      },
      "v4 Turbo": {
        "list": 0.04,
        "promo": 0.011,
        "promoUntil": "2026-10-12"
      }
    },
    "maxCharactersPerRequest": {
      "Eleven v3": 5000,
      "Multilingual v2": 10000,
      "Flash v2.5": 40000
    },
    "sources": [
      "https://elevenlabs.io/pricing/api",
      "https://elevenlabs.io/docs/models",
      "https://elevenlabs.io/voice-library"
    ],
    "voiceLibrary": "Access a library of 10,000+ studio quality voices",
    "vendorStatedModelLatency": {
      "Flash / Turbo": "~75ms",
      "v4 Turbo": "~100ms"
    }
  },
  "deepgram": {
    "pricesPer1KCharactersPayAsYouGo": {
      "Flux TTS": 0.045,
      "Aura-2": 0.03,
      "Aura-1": 0.015
    },
    "fluxTtsOffer": {
      "matchingCreditsPerDollar": 1,
      "capUSD": 500,
      "until": "2026-12-31"
    },
    "freeCreditUSD": 200,
    "ttsPositioning": "Generate natural, low-latency speech for your voice assistants and conversational AI applications.",
    "novaLanguages": "Nova models support 45+ languages",
    "aura2Voices": {
      "total": 90,
      "byLanguage": {
        "en": 41,
        "es": 17,
        "nl": 9,
        "it": 9,
        "de": 7,
        "ja": 5,
        "fr": 2
      }
    },
    "streamingTransport": "WebSocket",
    "streamingDocSections": [
      "Establish a WebSocket Connection",
      "Sending Text and Retrieving Audio",
      "Use One WebSocket per Conversation"
    ],
    "sources": [
      "https://deepgram.com/pricing",
      "https://developers.deepgram.com/docs/tts-models",
      "https://developers.deepgram.com/docs/streaming-text-to-speech"
    ]
  },
  "cartesia": {
    "model": "Sonic-3.6",
    "vendorStatedLatency": "sub-90ms latency",
    "languages": 44,
    "sources": [
      "https://www.cartesia.ai/sonic"
    ]
  }
}