TTS-1
Default
Text-to-speech model optimized for speed
Text-to-speech model optimized for speed
Performance
Average
Speed
Fast
Price
$15
Cost
Input
Text
Output
Audio
TTS is a model that converts text to natural sounding spoken text. The tts-1 model is optimized for realtime text-to-speech use cases. Use it with the Speech endpoint in the Audio API.
Pricing
Pricing is based on the number of tokens used, or other metrics based on the model type. For tool-specific models, like search and computer use, there’s a fee per tool call. See details in the pricing page.
Pricing
Per 1M tokens
Use case
Speech generation
Cost
$15.00
Quick comparison
Cost
TTS-1 HD
$30.00
TTS-1
$15.00
Modalities
Text
Input only
Image
Not supported
Audio
Output only
Video
Not supported
Endpoints
Chat Completions
v1/chat/completions
Responses
v1/responses
Realtime
v1/realtime
Assistants
v1/assistants
Batch
v1/batch
Fine-tuning
v1/fine-tuning
Embeddings
v1/embeddings
Image generation
v1/images/generations
Videos
v1/videos
Image edit
v1/images/edits
Speech generation
v1/audio/speech
Transcription
v1/audio/transcriptions
Translation
v1/audio/translations
Moderation
v1/moderations
Completions (legacy)
v1/completions
Snapshots
Snapshots let you lock in a specific version of the model so that performance and behavior remain consistent. Below is a list of all available snapshots and aliases for TTS-1.
tts-1
tts-1
tts-1
Rate limits
Rate limits ensure fair and reliable access to the API by placing specific caps on requests or tokens used within a given time period. Your usage tier determines how high these limits are set and automatically increases as you send more requests and spend more on the API.
| Tier | RPM | RPD |
|---|---|---|
| Free | 3 | 200 |
| Tier 1 | 500 | - |
| Tier 2 | 2,500 | - |
| Tier 3 | 5,000 | - |
| Tier 4 | 7,500 | - |
| Tier 5 | 10,000 | - |