OpenAI TTS alternative

Keep your OpenAI code and get Indian voices.

Fourier TTS takes the same request, so your code stays. Point it at our URL and model, and it speaks Hindi, Gujarati, Tamil or Telugu.

OpenAI’s numbers checked 17 October 2026.

Compare
The Frequency console: Agent Studio with four agents in Hinglish, Hindi, Tamil and Gujarati, and a test call in the browser.

Why switch

Why people switch to Frequency.

Everything a phone call in India needs, from one team, priced in rupees.

Fourier TTS

₹1.80 per 1,000 characters.²

On pay as you go and on Business, paid from one rupee wallet. No plan to pick first.

Five languages, live.

Hindi, English, Gujarati, Tamil and Telugu. And the Hinglish in between, mid-sentence.

Every call runs on our own GPUs in India.

The listening, the thinking and the voice are ours: Fourier STT, Gemma 4 26B and Fourier TTS.

Ready for the phone line.

Ask for 8 kHz μ-law or A-law and send it straight down the line. Or take 48 kHz PCM for everything else.

Phone agents, on the same key.

When you want the whole call, the same key and wallet run our voice agents.

AI agents from ₹1 a minute.¹

Hear it before you decide.

Real lines from Fourier TTS, one request each, unedited. Pick a language and press play.

Hear it

Same request, an Indian voice

Here is how OpenAI and Frequency differ.

OpenAI's speech API is simple to use, and its own guide says the voices are optimised for English. If your users speak Hindi, Gujarati, Tamil or Telugu, Fourier TTS takes the same request, so your code stays. Change the base URL and the model name, and you get voices that slip into English naturally, at ₹1.80 per 1,000 characters.

OpenAI’s speech endpoint is one small part of a very big API. One model covers many languages, and gpt-4o-mini-tts even takes a written note on tone. If most of what you generate is English, it’s a fine place to stay.

OpenAI’s guide also says its voices are “optimized for English”. Ours are built for India first. They read a Hindi sentence that drops in “order confirm” or “refund process” without changing voice, which is how most calls here sound. Fourier TTS is the voice our own phone agents speak with, and every line is made on our GPUs in India.

Hear it.

Real lines from Fourier TTS. Pick one, press play.

Text149 characters

Hi, मैं नेहा बोल रही हूँ Acme Store से। आपका order dispatch हो गया है और Friday तक deliver हो जाएगा। Address में कोई change करना हो तो अभी बता दीजिए।

48 kHz · MonoReady when you are

0:00 / 0:09

voice
Neha
language
Hinglish
speech
0:09
characters
149

Fourier TTS, voice neha, rendered 16 Oct 2026. One request, not edited.

Text119 characters

नमस्ते, मैं श्रुति बोल रही हूँ, दाँतों के क्लिनिक से। कल सुबह डॉक्टर साहब से आपका मिलना तय है। क्या आप समय पर आ पाएँगे?

48 kHz · MonoReady when you are

0:00 / 0:08

voice
Shruti
language
Hindi
speech
0:08
characters
119

Fourier TTS, voice shruti, rendered 16 Oct 2026. One request, not edited.

Text117 characters

નમસ્તે, હું આશુ બોલું છું. તમારી લોનનો હપ્તો આવતા અઠવાડિયે ભરવાનો છે. તમે કહો તો હું અત્યારે જ ભરવાની રીત સમજાવી દઉં.

48 kHz · MonoReady when you are

0:00 / 0:08

voice
Ashu
language
Gujarati
speech
0:08
characters
117

Fourier TTS, voice ashu, rendered 17 Oct 2026. One request, not edited.

Text167 characters

வணக்கம், நான் நேஹா பேசுகிறேன். உங்கள் பார்சல் நாளை மாலைக்குள் வந்து சேரும். அந்த நேரத்தில் நீங்கள் வீட்டில் இல்லையென்றால் சொல்லுங்கள், வேறு நாளுக்கு மாற்றி விடுகிறோம்.

48 kHz · MonoReady when you are

0:00 / 0:10

voice
Neha
language
Tamil
speech
0:10
characters
167

Fourier TTS, voice neha, rendered 17 Oct 2026. One request, not edited.

Text114 characters

నమస్కారం, నేను సమీర్ మాట్లాడుతున్నాను. నిన్న మీరు మా కొత్త ఇళ్ళ గురించి అడిగారు. ఇప్పుడు కొంచెం సేపు మాట్లాడవచ్చా?

48 kHz · MonoReady when you are

0:00 / 0:08

voice
Sameer
language
Telugu
speech
0:08
characters
114

Fourier TTS, voice sameer, rendered 17 Oct 2026. One request, not edited.

Side by side

Here is OpenAI beside Frequency.

Every price in rupees³, from their own pages and ours.⁴

Price

What it costs

For 10 lakh characters, tts-1 costs ₹1,424 and tts-1-hd costs ₹2,849. Fourier TTS costs ₹1,800. So tts-1 is the cheapest of the three, and the voice is the reason to pay a little more. Our price doesn’t change with the format, and a request that fails costs nothing.

OpenAI has also deprecated all three of its speech models. They leave the API on January 6, 2027.

Building a whole phone agent? Then compare by the minute instead. Ours cost ₹1 a minute on the volume plan, with the listening, the thinking and the voice included.

Text to speech, ₹ per 10 lakh characters
Text to speech, OpenAI TTS and Frequency, in rupees per 10 lakh characters
OptionBar₹ per 10 lakh characters
tts-1 ₹1,424$15
tts-1-hd ₹2,849$30
Fourier TTS every plan, from the first character ₹1,800
How we read these numbers

Dollar prices converted at ₹94.96, the ECB reference rate on 16 October 2026. The rate.

10 lakh is 1 million. gpt-4o-mini-tts is priced by tokens, so it has no per-character price to draw.

From developers.openai.com/api/docs/pricing, checked . Ours from our price list.

What speech costs, OpenAI TTS and Frequency, in their words
DetailOpenAI TTSFrequency
Published price gpt-4o-mini-tts: $0.60 per 1M text input tokens and $12.00 per 1M audio output tokens. tts-1: $15.00 per 1M characters tts-1-hd: $30.00 per 1M characters developers.openai.com ₹1.80 per 1,000 characters, on pay as you go and on Business (₹50,000/month commitment), before GST

Indian languages

Languages and voices, OpenAI TTS and Frequency
DetailOpenAI TTSFrequency
Indian languages The TTS model "generally follows the Whisper model" for languages, a list that includes Hindi, Kannada, Marathi and Tamil the guide says voices are "optimized for English" developers.openai.com Hindi, Gujarati, English, Tamil and Telugu, plus Hinglish voices that switch into English mid-sentence

Where it runs

Where it runs, OpenAI TTS and Frequency
DetailOpenAI TTSFrequency
Where it runs India region (in.api.openai.com) lists storage, not processing, for /v1/audio/speech data residency is for approved customers via sales developers.openai.com Every call and every request runs on our own GPUs in India

Getting started

Getting started, OpenAI TTS and Frequency
DetailOpenAI TTSFrequency
Model status tts-1, tts-1-hd and gpt-4o-mini-tts are deprecated and will be removed from the API on January 6, 2027 OpenAI points to gpt-realtime-2.1-mini developers.openai.com Fourier TTS is current, and it's the voice our own phone agents speak with
How to switch POST /v1/audio/speech with model, voice, input and response_format developers.openai.com The same POST /v1/audio/speech shape. Set the base URL to our /v1 and the model to mira-tts, and always send response_format

For developers

For developers, OpenAI TTS and Frequency
DetailOpenAI TTSFrequency
Phone-line audio MP3 (default), Opus, AAC, FLAC, WAV, and PCM at 24 kHz no μ-law, A-law or 8 kHz developers.openai.com PCM or WAV, 48 kHz by default, plus raw 8 kHz μ-law and A-law for phone lines. MP3 is not offered
Streaming Chunked transfer encoding, so audio can play before the whole file is generated developers.openai.com Raw PCM streams over HTTP as it renders a WebSocket endpoint keeps one connection open for a whole call

Spot something out of date? Tell us. Six platforms in one table: Voice AI platforms compared.

Which to pick

Which is right for you?

Sometimes it's them. We'll say so.

Choose OpenAI if…

  • You need speech in many languages from one model.
  • You want MP3, Opus or AAC straight from the API.
  • Your volume is English and price-led. tts-1 costs less per character than we do.
  • You already use OpenAI for everything and want one bill.

Choose Frequency if…

  • Your users speak Hindi, Gujarati, Tamil or Telugu, with English mixed in.
  • You want to keep your OpenAI code and change a couple of lines.
  • Your audio goes down a phone line, and you want 8 kHz μ-law ready to send.
  • You want a model that isn't on a shutdown list.

Moving

Moving your code across is easy.

Your code stays. Three values change.

  1. Step 1

    Open the sandbox.

    Look around with no sign-up. When you are ready, create a key in Developers.

  2. Step 2

    Change three values.

    The base URL, the model and the voice. The rest of your OpenAI code stays as it is.

  3. Step 3

    Pick a voice.

    Four voices, each speaking Hindi, English, Gujarati, Tamil and Telugu.

Open the sandbox

Switching is a few lines

Point the client at our URL, change the model, pick one of our voices, and always send response_format:

Leave out OpenAI-only fields such as instructions. For 16 or 8 kHz audio, pass sample_rate through extra_body. Every response carries X-Chars-Billed and X-Cost-Paise headers, so you can check our bill against your own logs while you run both. The OpenAI-compatible TTS guide goes step by step.

On a live call, one HTTP request per sentence opens a new connection every time. Our WebSocket endpoint keeps one open for the whole call, and lets you cut a reply short when the caller interrupts.

Listen before you switch

Take twenty lines your product really says: a name, a rupee amount, a date, an OTP, and English words inside your language. Write it in its own script. Render each on both, and play them to people who speak it every day, without saying which is which. Then play them again over a real phone call, because 8 kHz audio hides some flaws and shows others. The Hindi TTS comparison lists the other Hindi voices on the market, with their prices.

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ["MIRA_API_KEY"],
    base_url="https://sandbox.voice.miraiminds.co/v1",  # 1. our URL
)

with client.audio.speech.with_streaming_response.create(
    model="mira-tts",       # 2. our model
    voice="ashu",           # 3. one of our voices
    response_format="pcm",  # always send it
    input="चलिए, आपका order कल deliver होगा।",
) as response:
    for chunk in response.iter_bytes():
        ...  # raw 16-bit mono PCM at 48 kHz, playable as it arrives

Questions

Here is what people ask before switching from OpenAI.

Can I keep the OpenAI SDK?

Yes. Set base_url to https://sandbox.voice.miraiminds.co/v1, use your sk_live_ key and set the model to mira-tts. Send response_format every time, because OpenAI's default, mp3, returns an error from us.

Do OpenAI voice names like alloy work?

No. Our voices are ashu, neha, shruti and sameer. Ask for any other name and the error lists them. We never quietly swap in a different voice.

What do 10 lakh characters cost?

On OpenAI, ₹1,424 ($15) with tts-1 and ₹2,849 ($30) with tts-1-hd, so tts-1 costs less than we do. gpt-4o-mini-tts is billed by tokens, so it depends on the length of the audio. On Fourier TTS, ₹1,800.

Are OpenAI's speech models going away?

OpenAI has deprecated tts-1, tts-1-hd and gpt-4o-mini-tts, and says they leave the API on January 6, 2027. Its suggested replacement is gpt-realtime-2.1-mini, a different, token-priced model.

Where is the audio made?

In India. Every request runs on our own GPUs in Mumbai, Noida and Delhi.

Still deciding? Ask us.

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  1. AI agents from ₹1 a minute: on our volume plan, ₹1,00,000 a month. Pay as you go is ₹5 a minute. Prices exclude GST.

  2. Fourier TTS is ₹1.80 per 1,000 characters on pay as you go and on Business (₹50,000 a month). All prices exclude GST.

  3. Dollar prices converted at ₹94.96, the ECB reference rate on 16 October 2026. The rate.

  4. OpenAI TTS’ figures are from their own pages, linked beside each one and listed under Sources, checked . Ours are from our price list and docs.