This model is built for developers building conversational voice agents that require native audio input and output in a single WebSocket round-trip. Reach for it when you need low-latency, multilingual voice interactions with selectable voices.
Modalities
Text → Audio
Price
$0.0389 / min
Speed
fast
Pricing
Per minute of audio processed. Min billable: 1 minute.
$0.0389 / minWhen to use Gemini 2.5 Flash Native Audio
Where this model earns its cost — and where it doesn't.
Gemini 2.5 Flash Native Audio processes spoken input and generates spoken responses natively, eliminating the need for separate transcription and synthesis pipelines. It connects over WebSockets with ephemeral token authentication and supports 30 selectable voices across 24 output languages.
On Kyma, the model runs behind automatic request failover and returns exact session costs in the usage.cost field. Prompt caching is enabled, billing repeated input prefixes at 10% of the standard input cost. Every request routes through a single OpenAI-compatible base URL using one API key.
The model does not support vision, structured outputs, or explicit reasoning steps, and it operates with a 1,800-token context window. Google is retiring this endpoint on 2026-10-20, and the gemini-3.1-flash-live-preview model serves as its direct successor at the same per-minute billing mode.
Conversational Voice Agents
Handles bidirectional audio streams for real-time customer support or virtual assistants without intermediate transcription.
Multilingual Voice Chat
Processes spoken input and generates responses across 24 languages using a single audio-native pipeline.
Selectable Voice Interfaces
Routes user audio through one of 30 available voice profiles for customized conversational UX.
Not ideal for: Do not use this model for tasks requiring image analysis, structured JSON outputs, or complex multi-step reasoning, as it only processes audio and lacks those capabilities.
Quick start
Up and running in under two minutes.
- 1
Create an API key
Sign up and grab a key from the dashboard — $0.50 free credit, no card required.
Get API key → - 2
Make your first request
Drop in your key and send a chat completion — fully OpenAI-compatible.
curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "gemini-2.5-flash-native-audio-preview-12-2025", "messages": [ {"role": "user", "content": "Explain prompt caching in one paragraph."} ] }' - 3
Stream responses
Add
"stream": trueto receive tokens as they arrive.curl https://kymaapi.com/v1/chat/completions \ -H "Authorization: Bearer YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "gemini-2.5-flash-native-audio-preview-12-2025", "stream": true, "messages": [{"role": "user", "content": "Hello!"}] }'
FAQ
Common questions about this model.
How much does Gemini 2.5 Flash Native Audio cost?
How do I use Gemini 2.5 Flash Native Audio?
How is billing calculated for this endpoint?
Can I reuse prompts to reduce costs?
What happens if the serving path degrades during a session?
More models by Google
See all 18 →| Model | Context | Input | Output |
|---|---|---|---|
 Gemini 3.6 Flash | 1M | $2.025 | $10.125 |
| Gemini 3.5 Flash Lite | 1M | $0.405 | $3.375 |
| Gemini 3.5 Live Translate | — | $0.0635 / min | |
| Gemini 3.5 Flash | 1M | $2.025 | $12.15 |
 Gemma 4 31B | 128K | $0.0702 | $0.2006 |
| Gemini 3.1 Flash Live | — | $0.0389 / min | |
| Nano Banana 3 Flash (preview) | — | $0.046 / image | |
| Gemini 3 Flash (Audio) | — | $0.0026 / min | |