TTS 1
Low-latency text-to-speech model from OpenAI optimized for real-time voice generation and interactive conversational applications.
OpenAI
OpenAI
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 tts-1 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 TTS 1 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
Frequently asked questions
What is TTS 1?
Low-latency text-to-speech model from OpenAI optimized for real-time voice generation and interactive conversational applications.
How much does TTS 1 cost?
TTS 1 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 TTS 1 support tool calling and structured outputs?
No. TTS 1 does not support tool calling, so it cannot invoke external tools or functions.
What inputs and outputs does TTS 1 support?
TTS 1 is a audio speech model. See the specifications section above for its exact supported input and output modalities.
How do I use TTS 1 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/tts-1".
When was TTS 1 released?
TTS 1 was released on November 6, 2023.
Where is the TTS 1 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 Whisper 1 (nrouter.ai/models/whisper-1), o1 (nrouter.ai/models/o1), GPT-5.5 Pro (nrouter.ai/models/gpt-5.5-pro), GPT-4o Mini TTS (nrouter.ai/models/gpt-4o-mini-tts-2025-12-15).
Pricing is live — see above for current rates.