OpenAI TTS-1 HD

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

Sprogudtale (TTS)Tilgængelig

af OpenAIopenai-tts-1-hd

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

Prøv det Få API-nøgle Sammenlign

Pris: 0,036 US$/1.000 tegn
Input → output: Tekst → Lyd
Udvikler: OpenAI
Opdateret: 23. september 2026

Playground

Prøv OpenAI TTS-1 HD

Input & resultat

0,036 US$/1.000 tegn

Tekst

Stemme(valgfrit)

Avancerede indstillinger (1)

Format(valgfrit)

⌘/Ctrl + Enter

Resultat

Den genererede tale vises her.

Denne kørsel

0,0001 US$ · 0,01 credits

Ny her?

10 gratis credits (0,10 US$) når du tilmelder dig med Google

Kan bruges 24 timer efter tilmelding, op til 5 kørsler pr. dag og højst 2 credits pr. kørsel. Andre login-metoder starter uden credits. Nok til 1.000 kørsler af denne model.

Om OpenAI TTS-1 HD

Kort sagtFra 23. september 2026

OpenAI TTS-1 HD er en model af OpenAI i kategorien Sprogudtale (TTS). På Railwail koster OpenAI TTS-1 HD 0,036 US$ pr. 1.000 tegn.

Baggrund

Om OpenAI

Grundlagt 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.

Besøg 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.

Parametre: Undisclosed (larger than TTS-1)
Kontekst: 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

Træning og 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.

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

Kendte begrænsninger

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

Forskningsartikler

Priser

Priser i US-dollar. Forbrug debiteres fra forudbetalte credits.

1.000 tegn	0,036 US$ pr. 1.000 tegn

1 kredit = 0,01 US$

Omkostningsberegner

Prisberegner

Tegn pr. kørsel

/ kørsel

Kørsler

I alt

3,60 US$

360 credits

Pr. kørsel

0,036 US$ · 3,6 credits

Fast pris pr. kørsel, kendt før kørslen starter.

API

Kald OpenAI TTS-1 HD med din Railwail API-nøgle. Brug dette model-ID i anmodningen:

openai-tts-1-hdAPI-dokumentation Få en API-nøgle

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()));

Indstil din nøgle som RAILWAIL_API_KEYOpret API-nøgle

Specifikationer

Model-ID: openai-tts-1-hd
Udvikler: OpenAI
Kategori: Sprogudtale (TTS)
Input: Tekst
Output: Lyd
Outputformater: MP3, OPUS, AAC, FLAC
Fakturering: Fastpris, kendt før kørslen
Modelstørrelse: 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.
Katalogelement opdateret: 23. september 2026

Inputparametre

Inputs og indstillinger fra modellens inputskema. Eksemplet i API-afsnittet viser, hvilke af dem API'en accepterer.

ParameterTypeStandardTilladte værdier

textpåkrævet
Type: Tekst
Standard: –
Tilladte værdier: –
voice
Type: Valg
Standard: –
Tilladte værdier: alloy, echo, fable, onyx, nova eller shimmer
response_format
Type: Valg
Standard: –
Tilladte værdier: mp3, opus, aac eller flac

Eksempelprompts

Eksempler fra Railwail-kataloget. De blev ikke genereret live på denne side.

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
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Anvendelsestilfælde

Hvad det bruges til

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

Relaterede vejledninger

AI Voice & Text-to-Speech Models

Alle modeller i Sprogudtale (TTS)

Ofte stillede spørgsmål

Hvad er OpenAI TTS-1 HD?

OpenAI TTS-1 HD er en model fra OpenAI i kategorien Sprogudtale (TTS). På Railwail kan du kalde den med en API-nøgle via Railwail API.

Hvad koster OpenAI TTS-1 HD på Railwail?

På Railwail koster OpenAI TTS-1 HD 0,036 US$ pr. 1.000 tegn. Prisen kendes før kørslen starter. Forbrug betales fra forudbetalte credits; 1 credit svarer til 0,01 US$.

Hvilke indstillinger understøtter OpenAI TTS-1 HD?

Ifølge dens inputskema kender OpenAI TTS-1 HD disse parametre: text, voice (alloy, echo, fable, onyx, nova eller shimmer) og response_format (mp3, opus, aac eller flac).

Hvor hurtig er OpenAI TTS-1 HD?

Der er endnu ikke nok målte kørsler af OpenAI TTS-1 HD på Railwail til at angive en udførelsestid. Det afhænger af inputtet, indstillingerne og belastningen hos provideren.

Er OpenAI TTS-1 HD bedre end AudioLDM 2?

Det afhænger af opgaven. OpenAI TTS-1 HD (OpenAI) og AudioLDM 2 (Haohe Liu) er begge modeller i kategorien Sprogudtale (TTS). Sammenligningssiden viser deres priser og specifikationer side om side.

Sammenlign OpenAI TTS-1 HD og AudioLDM 2

Hvordan bruger jeg OpenAI TTS-1 HD via API'en?

Opret en Railwail API-nøgle og send din anmodning med model-ID'en openai-tts-1-hd. Kodeeksempler til curl, Python og JavaScript findes i API-sektionen på denne side.

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Brug OpenAI TTS-1 HD via API'en

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