GPT-4o Mini TTS
Audio speech model by OpenAI.
OpenAI text-to-speech voice generation model. Converts input text into natural, expressive spoken audio across multiple voice styles.
Specifications
Context window, ranked against other audio speech models
Insufficient data
No published context window for this model or its peers.
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audio speech
Pricing
Rates are read live
Pricing for gpt-4o-mini-tts is fetched from the live catalogue on load, so it is never served from a cache that could outlive a repricing.
Availability
Not enough data yet
We have not collected enough health probes for this model to publish an uptime or latency figure. A percentage from a handful of samples is fabricated precision, so none is shown until the sample count supports one.
How GPT-4o Mini TTS is billed
Billed at the provider's list price, with no per-token markup.
- Exact list price
- Tokens settle at the published rate of the model that served your call.
- Cache discounts passed through
- Provider prompt-caching discounts reach your balance with no added fee.
- Cost on every response
- Each response carries the
x-nr-request-costheader, so you can reconcile spend per request.
More from OpenAI
FAQs
What is GPT-4o Mini TTS?
OpenAI text-to-speech voice generation model. Converts input text into natural, expressive spoken audio across multiple voice styles.
How much does GPT-4o Mini TTS cost?
GPT-4o Mini TTS is billed at the provider's list price on nRouter with no per-token markup — tokens settle at the exact upstream rate. Input and output rates are read live, so see the pricing section above for the current figures.
Does GPT-4o Mini TTS support tool calling and structured outputs?
No. GPT-4o Mini TTS does not support tool calling, so it cannot invoke external tools or functions.
What inputs and outputs does GPT-4o Mini TTS support?
GPT-4o Mini TTS is a audio speech model. See the specifications section above for its exact supported input and output modalities.
How do I use GPT-4o Mini TTS via nRouter?
Use any OpenAI-compatible client: point it at https://api.nrouter.ai/v1 with your nRouter API key and set the model to "openai/gpt-4o-mini-tts".
When was GPT-4o Mini TTS released?
GPT-4o Mini TTS was released on August 30, 2026.
Where is the GPT-4o Mini TTS documentation?
Start at nrouter.ai/docs. The quick-start guide (nrouter.ai/docs/getting-started/quick-start) covers API keys and your first request, and the API reference (nrouter.ai/docs/api-reference) lists every parameter.
What other audio models does OpenAI have?
Other OpenAI audio models on nRouter include GPT-OSS 120B 1 (nrouter.ai/models/gpt-oss-120b-1), GPT-6.1 Sol (nrouter.ai/models/gpt-6.1-sol), GPT-5.2 Pro (nrouter.ai/models/gpt-5.2-pro-2025-12-11), GPT Audio 1.5 (nrouter.ai/models/gpt-audio-1.5).