Rime Prism

Rime Prism is a speech-to-speech model. It handles transcription, reasoning, and voice synthesis in a single phone-ready model that finds turns and handles interruptions itself, with a short spoken phrase while tools run. It goes in the pipeline’s llm slot with no separate STT or TTS, and the Pipeline auto-detects Realtime mode when you pass it.

Setup

Set your Rime API key in the worker environment. Generate a key from the Rime site:

export RIME_API_KEY=<key>

Usage

Pass the realtime model to the pipeline’s llm slot, no stt or tts needed.

from zeroruntime import Pipeline
from zeroruntime.plugins import RimeRealtimeConfig, RimeRealtime

llm = RimeRealtime(
    config=RimeRealtimeConfig(
        voice="astra",
        eagerness="low",
    ),
)

pipeline = Pipeline(llm=llm)

RimeRealtime ships in the Python SDK only. The Node JS SDK does not include this plugin yet.

RimeRealtime requires a zeroruntime release newer than 0.1.9.

Rime’s TTS voices do not work with Prism. Use a Prism voice: astra, aurora, brando, or wawona. See Rime TTS for the text-to-speech plugin.

Parameters

Constructor parameters for RimeRealtime.

Parameter	Type	Default	Description
`api_key`	`str`	`None`	Rime API key. Falls back to the `RIME_API_KEY` environment variable when unset.
`model`	`str`	`"prism"`	Reported in metrics only. Prism has a single model and this cannot select another.
`config`	`dict \| None`	`None`	Conversation settings: voice, interruption and how readily a turn ends.
`base_url`	`str \| None`	`None`	WebSocket URL of the Prism endpoint.

`config` keys

config takes a RimeRealtimeConfig or a plain dict with the same keys.

Field	Type	Default	Description
`voice`	`str`	`"astra"`	Prism voice: ‘astra’, ‘aurora’, ‘brando’ or ‘wawona’. Rime’s TTS voices do not work with Prism.
`interrupt_response`	`bool`	`True`	Whether the caller’s speech during a reply interrupts it.
`eagerness`	`Literal['auto', 'low', 'medium', 'high']`	`"auto"`	How readily Prism decides the caller has finished: ‘auto’, ‘low’, ‘medium’ or ‘high’. Use ‘low’ when callers often pause mid-sentence. Fixed for the call.
`end_of_turn_timeout_ms`	`int`	`5000`	Silence that ends the caller’s turn even when Prism is not sure they have finished, 1000 to 10000. Fixed for the call.

To pair the realtime model with an external STT or TTS, see Hybrid mode. For general plugin concepts, see the plugins overview.

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Setup

Usage

Parameters

`config` keys

​Setup

​Usage

​Parameters

​config keys

Setup

Usage

Parameters

`config` keys