AI model by OpenAI
GPT-4o mini TTS for business
OpenAI's current text-to-speech model for turning text into natural spoken audio, at a low price level.
- Reviewed on September 24, 2026
- OpenAI
Capability tiersRelative, not benchmarks
Key facts about GPT-4o mini TTS
- Model ID at review
- gpt-4o-mini-tts
- Provider
- OpenAI
- Main category
- Speech
- Open weights
- No, available as a hosted service
- Last reviewed
- September 24, 2026
Fit
Where it fits and where it does not
Good at
-
Spoken replies in voice assistants.
-
Audio versions of articles and messages.
-
Accessibility features in apps.
-
Low-cost speech at volume.
-
Simple integration through the same API as other OpenAI models.
Not the right choice for
-
Cloning a specific person's voice.
-
Very long texts in one request, given the 2,000 token input limit.
-
Transcription, which needs a speech-to-text model.
-
Pretending an AI voice is a real person.
Use cases
Business use cases we would use it for
Audio content
Accessibility
Our notes
When we would choose it
gpt-4o-mini-tts is OpenAI's current text-to-speech model at the time of review, with a default snapshot from December 2025. It turns text of up to 2,000 tokens into spoken audio. The older tts-1 and tts-1-hd models are still listed without a deprecation notice.
For many business uses, a low-cost, natural-sounding voice is all that is needed: reading a reply aloud in an app, voicing a phone assistant or producing audio versions of help content. For voice cloning, many languages or very expressive speech, a specialist such as ElevenLabs may fit better.
In a voice assistant, text-to-speech is one link in a chain: speech-to-text, a language model, then speech again. The total delay matters more than any single step. We measure it end to end on real calls, and we keep responses short so speech can start quickly.
Whatever voice you use, tell callers and listeners that they are hearing an AI voice. It is honest, it sets expectations and in many places it is required. See voice AI and AI customer support.
Finally, test the voice with the people who will hear it. A short listening session with a few customers or staff often reveals problems with pace, pronunciation of names or tone that no metric will catch.
Before you commit
Things to check before you commit
-
Input limit
The input limit is 2,000 tokens, so long texts must be split.
-
Voice fit
Listen to the available voices with your own scripts and brand tone.
-
Disclosure
Tell listeners when a voice is AI-generated.
-
Latency
For live calls, measure the full delay from text to first audio.
Alternatives
Models to compare it with
ElevenLabs Eleven v3
ElevenLabs text-to-speech: the expressive Eleven v3 in 70+ languages, a real-time conversational version, and the low-latency Flash models, with voice cloning.
GPT Transcribe
OpenAI's current speech-to-text model, replacing Whisper and the GPT-4o transcribe models, with streaming and keyword or language hints.
Deepgram Nova-3 and Flux
Deepgram's speech-to-text models: Nova-3 for general transcription in 60+ languages, and Flux for voice agents with built-in end-of-turn detection.
Keep exploring
Solutions, services and guides
Related services
View all related services- Voice AI Speech to text, call summaries and voice assistants that take bookings or answer routine calls.
- AI chatbots Website and messaging chatbots that answer common questions well and hand everything else to a person.
- Customer portals A secure place where your customers upload documents, check status, pay and message your team.
- Cross-platform apps One codebase for iOS and Android with React Native or Flutter, so both apps ship together.
Solutions
View all solutions- AI support agent An assistant that answers routine questions from your own content, checks orders and hands anything else to a person.
- Scheduling automation Let customers book, change and confirm appointments themselves, by web, chat or phone, with reminders that cut no-shows.
- Meeting notes automation Transcribe meetings and calls, summarize decisions and push action items into your CRM or project tool.
Industries
View all industries- Hospitality and travel Booking sites, guest messaging, review analysis and multilingual content for hotels, tour operators and travel businesses.
- Vacation rentals Booking websites, owner and guest portals, turnover scheduling and guest messaging for rental operators.
- Home services Booking, dispatch, quotes, invoicing and reviews for plumbers, electricians, cleaners and other home service businesses.
- Healthcare Patient booking, intake forms, internal knowledge assistants and admin automation for clinics and care providers.
- Ecommerce Online stores, product data cleanup, support assistants, price monitoring and order automation for online retailers.
Guides and articles
View all guides and articlesMCP servers
View all mcp servers- Discord A community MCP server that lets AI read and send Discord messages, react, send direct messages and manage channels through a bot.
- BigCommerce BigCommerce's official Storefront MCP, in beta, lets AI shopping assistants browse the catalog, build carts and hand shoppers to checkout.
- Gmail Google's own Gmail MCP server lets AI search and read threads, manage labels and create drafts. It has no send tool.
- Slack Slack's own hosted MCP server lets AI search messages, read channels and threads, look up people, draft or send messages and create canvases.
- Zendesk A community MCP server that lets AI read Zendesk tickets, comments and attachments, create tickets and add comments.
Glossary terms
View all glossary terms- Chatbot A chatbot is software that holds a conversation with people through text or voice, answering questions or completing simple tasks.
- Natural language processing Natural language processing is the field of AI that deals with understanding and generating human language, in text or speech.
- System prompt A system prompt is the standing set of instructions an application gives an AI model, defining its role, rules and style for every conversation.
- Artificial intelligence Artificial intelligence is the broad field of building software that performs tasks that normally need human judgment, such as understanding language or images.
- Frontend The frontend is the part of a website or app that people see and use, including pages, forms, buttons and how they respond.
- Latency Latency is the delay between a request and its response, such as how long a page takes to start loading or an AI model takes to reply.
FAQ
Questions people ask us
Have a question that is not here? Ask us directly.
2,000 tokens per request. Split longer texts into parts.
Not as a voice cloning product. For cloning, look at specialists such as ElevenLabs, with consent from the speaker.
It can be. Measure the total delay from caller speech to spoken reply on real calls.