OpenAI TTS-1 HD

Name: OpenAI TTS-1 HD
Brand: OpenAI
SKU: openai-tts-1-hd
Price: 0.036 USD
Availability: InStock

Sprachsyntes (TTS)Tillgänglig

av OpenAIopenai-tts-1-hd

OpenAI's high-definition TTS model. Better quality for production use cases.

Prova Hämta API-nyckel Jämför

Pris: 0,036 US$/1 000 tecken
Inmatning → utmatning: Text → Audio
Utvecklare: OpenAI
Uppdaterad: 23 september 2026

Playground

Prova OpenAI TTS-1 HD

Inmatning & resultat

0,036 US$/1 000 tecken

Text

Röst(valfritt)

Avancerade inställningar (1)

Format(valfritt)

⌘/Ctrl + Enter

Resultat

Det genererade talet visas här.

Denna körning

0,0001 US$ · 0,01 credits

Ny här?

10 gratis credits (0,10 US$) när du registrerar dig med Google

Användbar 24 timmar efter registrering, upp till 5 körningar per dag och högst 2 credits per körning. Andra inloggningsmetoder startar utan credits. Räcker för 1 000 körningar av denna modell.

Om OpenAI TTS-1 HD

Kort sagtFrån och med 23 september 2026

OpenAI TTS-1 HD är en modell av OpenAI i kategorin Sprachsyntes (TTS). På Railwail kostar OpenAI TTS-1 HD 0,036 US$ per 1 000 tecken.

Bakgrund

Om OpenAI

Grundat 2015 · San Francisco, California, USA

OpenAI was founded in December 2015 by Sam Altman, Elon Musk, Greg Brockman, Ilya Sutskever, Wojciech Zaremba and John Schulman as a non-profit AI research lab, restructured to capped-profit OpenAI LP in 2019. The company is best known for the GPT, DALL-E and Whisper model families and has raised more than $13B from Microsoft and billions more from Thrive Capital, Sequoia, Khosla and SoftBank, with a 2024 valuation above $157B. The TTS-1 HD model launched together with TTS-1 in November 2023 as the high-quality sibling, intended for offline audiobook, podcast and content-production workflows where fidelity matters more than latency. It powers the higher-quality option in the OpenAI audio endpoint and is exposed in tools like ChatGPT's Read Aloud feature on premium tiers.

Besök OpenAI

Arkitektur

Proprietary Transformer text-to-speech with neural codec (high-fidelity variant)

OpenAI TTS-1 HD is the high-fidelity variant of the TTS-1 family. It uses the same architectural family (Transformer-based neural-codec language-model TTS) and the same six voices (alloy, echo, fable, onyx, nova, shimmer) as TTS-1, but with a larger model and additional fine-tuning on long-form narration. The result is more natural prosody, clearer diction and better handling of long sentences, punctuation and emotional pacing, at roughly 2x the price ($0.030 per 1,000 characters) and noticeably higher latency. Output is 24 kHz in six formats (MP3, Opus, AAC, FLAC, WAV, PCM). Text input is capped at 4,096 characters per request, which is recommended to be split into paragraph chunks for very long narration. The model targets offline production: audiobooks, podcasts, training videos, accessibility narration. It does not support voice cloning.

Parameter: Undisclosed (larger than TTS-1)
Kontext: 4 096 tokens

Funktioner

High-fidelity narration with natural prosody and emotional pacing
Six recorded voices: alloy, echo, fable, onyx, nova, shimmer
Multilingual: 50+ languages including English, German, Spanish, French, Italian, Japanese, Mandarin
Six output formats including FLAC for lossless production
Long-sentence handling tuned for audiobook-style narration
Drop-in API-compatible with TTS-1 (just change the model name)
Best for: audiobooks, podcasts, training content, voiceover, accessibility narration

Träning & licens

Not disclosed. OpenAI states voices were recorded with paid professional actors; training corpus is a curated mix of recorded speech and licensed text-audio pairs.

Licens: Proprietary commercial API. Generated audio may be used commercially under the OpenAI Usage Policy; the six stock voices cannot be impersonated outside the API.

Säkerhetstestning: Same Preparedness red-team coverage as TTS-1; voice cloning is intentionally not exposed; outputs may carry provenance metadata.

Kända begränsningar

No voice cloning
2x price of TTS-1 ($0.030 vs $0.015 per 1k chars)
Higher latency unsuitable for real-time voice agents
Hard cap of 4,096 characters per request
Limited explicit prosody / emotion controls

Forskningsartiklar

Priser

Priser i US-dollar. Användningen debiteras från förbetald kredit.

1 000 tecken	0,036 US$ per 1 000 tecken

1 kredit = 0,01 US$

Kostnadsräknare

Prisräknare

Tecken per körning

/ körning

Körningar

Totalt

3,60 US$

360 krediter

Per körning

0,036 US$ · 3,6 krediter

Fast pris per körning, känt innan körningen startar.

API

Anropa OpenAI TTS-1 HD med din Railwail API-nyckel. Använd detta modell-ID i begäran:

openai-tts-1-hdAPI-dokumentation Hämta API-nyckel

curl https://railwail.com/api/v1/audio/speech \
  -H "Authorization: Bearer $RAILWAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai-tts-1-hd",
    "input": "Hello from railwail. This sentence was spoken by a text-to-speech model.",
    "voice": "alloy"
  }' \
  --output speech.mp3

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["RAILWAIL_API_KEY"],
    base_url="https://railwail.com/api/v1",
)

with client.audio.speech.with_streaming_response.create(
    model="openai-tts-1-hd",
    input="Hello from railwail. This sentence was spoken by a text-to-speech model.",
    voice="alloy",
) as response:
    response.stream_to_file("speech.mp3")

import fs from "node:fs";
import OpenAI from "openai";

const client = new OpenAI({
  apiKey: process.env.RAILWAIL_API_KEY,
  baseURL: "https://railwail.com/api/v1",
});

const speech = await client.audio.speech.create({
  model: "openai-tts-1-hd",
  input: "Hello from railwail. This sentence was spoken by a text-to-speech model.",
  voice: "alloy"
});

fs.writeFileSync("speech.mp3", Buffer.from(await speech.arrayBuffer()));

Ange din nyckel som RAILWAIL_API_KEYSkapa API-nyckel

Specifikationer

Modell-ID: openai-tts-1-hd
Utvecklare: OpenAI
Kategori: Sprachsyntes (TTS)
Inmatning: Text
Utmatning: Audio
Utmatningsformat: MP3, OPUS, AAC, FLAC
Fakturering: Fastpris, känt innan körningen
Modellstorlek: Undisclosed (larger than TTS-1)
Licens: Proprietary commercial API. Generated audio may be used commercially under the OpenAI Usage Policy; the six stock voices cannot be impersonated outside the API.
Kataloginlägg uppdaterat: 23 september 2026

Indataparametrar

Inmatningar och inställningar från modellens indataschema. Exemplet i API-avsnittet visar vilka som API:et accepterar.

ParameterTypStandardTillåtna värden

textobligatorisk
Typ: Text
Standard: –
Tillåtna värden: –
voice
Typ: Val
Standard: –
Tillåtna värden: alloy, echo, fable, onyx, nova eller shimmer
response_format
Typ: Val
Standard: –
Tillåtna värden: mp3, opus, aac eller flac

Taggar

high-quality

Exempelprompts

Exempel från Railwail-katalogen. De genererades inte live på denna sida.

Audiobook Passage
The old lighthouse keeper climbed the spiral stairs for the last time. Forty years of storms, shipwrecks, and solitary nights had carved deep lines into his face. But tonight, as the automated beacon flickered to life without him, he felt not relief but an aching emptiness—the sea no longer needed his watchful eyes.
Product Demo
Introducing AuraSync, the smart home hub that learns your routines. It dims the lights when you start a movie, adjusts the thermostat when you fall asleep, and brews your coffee exactly six minutes before your alarm. Your home, finally as intelligent as you are.

Användningsfall

Vad det används till

Audiobook production
High-quality podcast narration
Training and e-learning voiceover
Marketing videos and explainer content
Accessibility narration for premium products

Relaterade guider

AI Voice & Text-to-Speech Models

Alla modeller i Sprachsyntes (TTS)

Vanliga frågor

Vad är OpenAI TTS-1 HD?

OpenAI TTS-1 HD är en modell av OpenAI i kategorin Sprachsyntes (TTS). På Railwail kan du anropa den med en API-nyckel via Railwail API.

Vad kostar OpenAI TTS-1 HD på Railwail?

På Railwail kostar OpenAI TTS-1 HD 0,036 US$ per 1 000 tecken. Priset är känt innan körningen startar. Användningen betalas från förbetald kredit; 1 kredit motsvarar 0,01 US$.

Vilka inställningar stöder OpenAI TTS-1 HD?

Enligt sitt inmatningsschema känner OpenAI TTS-1 HD till dessa parametrar: text, voice (alloy, echo, fable, onyx, nova eller shimmer) och response_format (mp3, opus, aac eller flac).

Hur snabb är OpenAI TTS-1 HD?

Det finns ännu inte tillräckligt många uppmätta körningar av OpenAI TTS-1 HD på Railwail för att ange en körningstid. Det beror på inmatningen, inställningarna och belastningen hos leverantören.

Är OpenAI TTS-1 HD bättre än AudioLDM 2?

Det beror på uppgiften. OpenAI TTS-1 HD (OpenAI) och AudioLDM 2 (Haohe Liu) är båda modeller i kategorin Sprachsyntes (TTS). Jämförelsesidan visar deras priser och specifikationer sida vid sida.

Jämför OpenAI TTS-1 HD och AudioLDM 2

Hur använder jag OpenAI TTS-1 HD via API:et?

Skapa en Railwail API-nyckel och skicka din begäran med modell-ID:t openai-tts-1-hd. Kodexempel för curl, Python och JavaScript finns i API-avsnittet på denna sida.

Jämförbara modeller

Alla i denna kategori

ChatterboxResemble AI
Resemble AI's open Chatterbox TTS. Zero-shot voice cloning from a short audio prompt with an exaggeration control for emotion intensity, plus CFG weight to balance pacing and fidelity.
0,030 US$/1 000 tecken
17 % billigare per enhet
Jämför OpenAI TTS-1 HD och Chatterbox
OpenAI TTS-1OpenAI
OpenAI's text-to-speech model. Six built-in voices with natural intonation.
0,018 US$/1 000 tecken
50 % billigare per enhet
Jämför OpenAI TTS-1 HD och OpenAI TTS-1
Qwen3 TTSAlibaba (Qwen)
A unified Text-to-Speech demo featuring three powerful modes: Voice, Clone and Design
0,024 US$/1 000 tecken
33 % billigare per enhet
Jämför OpenAI TTS-1 HD och Qwen3 TTS

Använd OpenAI TTS-1 HD via API:et

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