# End-of-Turn Detection Parameters

Flux provides configurable parameters that control end-of-turn detection and language biasing, allowing you to optimize your voice agent's conversational flow for your specific use case.

## Overview

Flux's behavior is controlled by the following key parameters:

| Parameter             | Range                    | Default | Required       | Description                                                                                                                                                                              |
| --------------------- | ------------------------ | ------- | -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `eot_threshold`       | `0.5` - `1.0`            | `0.7`   | No             | Confidence threshold for triggering `EndOfTurn` events. Set to `1.0` to suppress natural end-of-turn and drive turns with [`ForceEndTurn`](/guides/streaming-audio-flux-force-end-turn). |
| `eager_eot_threshold` | `0.3` - `0.9`            | _None_  | For eager mode | Confidence threshold for triggering `EagerEndOfTurn` events                                                                                                                              |
| `eot_timeout_ms`      | `500` - `60000`          | `5000`  | No             | Maximum silence duration (ms) before forcing `EndOfTurn`                                                                                                                                 |
| `language_hint`       | Supported language codes | _None_  | No             | Bias `flux-general-multi` toward specific languages. See [Language Prompting](/guides/streaming-audio-flux-language-prompting).                                                          |

## Parameter Details

### `eot_threshold`

Confidence threshold required to trigger an `EndOfTurn` event, signaling that the user has finished speaking.

**Valid Values:** `0.5` to `1.0`
**Default:** `0.7`
**Type:** Float (passed as string in URL or SDK)

**Behavior:**

- **Higher values** (e.g., `0.8` - `0.9`) = Higher certainty required before ending a turn, fewer false positives, slightly increased latency
- **Lower values** (e.g., `0.5` - `0.7`) = Lower certainty required before ending a turn, faster responses, more false positives
- **`1.0`** = Fully suppresses natural `EndOfTurn` detection. You take ownership of turn endings with [`ForceEndTurn`](/guides/streaming-audio-flux-force-end-turn); the `eot_timeout_ms` backstop still applies. See [Bring Your Own Turn Detection](/guides/streaming-audio-flux-own-turn-detection).

**Example:**

```bash
wss://api.deepgram.com/v2/listen?model=flux-general-en&eot_threshold=0.8
```

***

### `eager_eot_threshold`

Confidence threshold for triggering `EagerEndOfTurn` events, enabling early LLM response generation.

**Valid Values:** `0.3` to `0.9`
**Default:** _Not set_ (eager mode disabled)
**Type:** Float (passed as string in URL or SDK)

**Behavior:**

- **When set**: Enables `EagerEndOfTurn` and `TurnResumed` events
- **Lower values** (e.g., `0.3` - `0.5`) = Earlier triggers, lower latency, more false starts
- **Higher values** (e.g., `0.6` - `0.8`) = More conservative, fewer cancellations, less latency benefit

**Trade-offs:**

- ✅ Reduces E2E agent latency
- ❌ Increases LLM calls
- ❌ Requires handling `EagerEndOfTurn` speculative generation and `TurnResumed` cancellations

**Example:**

```bash
wss://api.deepgram.com/v2/listen?model=flux-general-en&eager_eot_threshold=0.6&eot_threshold=0.8
```

:::callout{intent="info"}
**Important**: The transcript in `EagerEndOfTurn` will **exactly match** the transcript in the subsequent `EndOfTurn` event (if no `TurnResumed` occurs). This guarantees consistency for caching strategies.
:::

***

### `eot_timeout_ms`

Maximum silence duration before forcing an `EndOfTurn`, regardless of confidence.

**Valid Values:** `500` to `60000` (milliseconds)
**Default:** `5000` (5 seconds)
**Type:** Integer (passed as string in URL or SDK)

**Behavior:**

- Forces `EndOfTurn` after specified silence duration, even if confidence is below `eot_threshold`
- Timer resets when new speech is detected
- **Increase** (e.g., `7000` - `10000`) for users with frequent pauses
- **Decrease** (e.g., `3000` - `4000`) for rapid-response environments

**Example:**

```bash
wss://api.deepgram.com/v2/listen?model=flux-general-en&encoding=linear16&sample_rate=16000&eot_timeout_ms=7000
```

## Parameter Interactions

### Validation Rules

- `eager_eot_threshold` must be **less than or equal to** `eot_threshold` (if both are set)
- Setting `eager_eot_threshold > eot_threshold` will result in an error
- All parameters are optional, but their values must be within valid ranges if specified

## Common Configurations

### Simple Mode (Default)

:::code-group
```python title="Python"
async with client.listen.v2.connect(
    model="flux-general-en",
    eot_threshold="0.7"  # Default value
) as connection:
    pass
```

```java title="Java"
import com.deepgram.api.DeepgramClient;
import com.deepgram.api.resources.listen.resources.v2.resources.v2websocket.V2WebSocketClient;

DeepgramClient client = DeepgramClient.builder().build();
V2WebSocketClient wsClient = client.listen().v2().v2WebSocket();
wsClient.connect(V2WebSocketOptions.builder()
    .model("flux-general-en")
    .eotThreshold("0.7") // Default value
    .build())
    .get(10, TimeUnit.SECONDS);
```
:::

**Best for:** Basic conversational agents, demos, getting started

***

### Low-Latency Mode

:::code-group
```python title="Python"
async with client.listen.v2.connect(
    model="flux-general-en",
    eager_eot_threshold="0.4",
    eot_threshold="0.7",
    eot_timeout_ms="6000"
) as connection:
    pass
```

```java title="Java"
V2WebSocketClient wsClient = client.listen().v2().v2WebSocket();
wsClient.connect(V2WebSocketOptions.builder()
    .model("flux-general-en")
    .eagerEotThreshold("0.4")
    .eotThreshold("0.7")
    .eotTimeoutMs("6000")
    .build())
    .get(10, TimeUnit.SECONDS);
```
:::

**Best for:** High-volume customer service, fast-paced Q\&A, responsiveness over accuracy

***

### High-Reliability Mode

:::code-group
```python title="Python"
async with client.listen.v2.connect(
    model="flux-general-en",
    eot_threshold="0.85",
    eot_timeout_ms="8000"
) as connection:
    pass
```

```java title="Java"
V2WebSocketClient wsClient = client.listen().v2().v2WebSocket();
wsClient.connect(V2WebSocketOptions.builder()
    .model("flux-general-en")
    .eotThreshold("0.85")
    .eotTimeoutMs("8000")
    .build())
    .get(10, TimeUnit.SECONDS);
```
:::

**Best for:** Medical/legal transcription, critical documentation, formal settings

***

### Complex Pipeline Mode

:::code-group
```python title="Python"
async with client.listen.v2.connect(
    model="flux-general-en",
    eager_eot_threshold="0.4",
    eot_threshold="0.85",
    eot_timeout_ms="7000"
) as connection:
    pass
```

```java title="Java"
V2WebSocketClient wsClient = client.listen().v2().v2WebSocket();
wsClient.connect(V2WebSocketOptions.builder()
    .model("flux-general-en")
    .eagerEotThreshold("0.4")
    .eotThreshold("0.85")
    .eotTimeoutMs("7000")
    .build())
    .get(10, TimeUnit.SECONDS);
```
:::

**Best for:** RAG systems, tool-calling agents, multi-step reasoning workflows

***

### Multilingual Mode

:::code-group
```python title="Python"
async with client.listen.v2.connect(
    model="flux-general-multi",
    encoding="linear16",
    sample_rate=16000,
    eot_threshold="0.7",
    request_options={
        "additional_query_parameters": {
            "language_hint": ["en", "es"],
        }
    },
) as connection:
    pass
```

```typescript title="JavaScript"
const connection = await client.listen.v2.connect({
  model: "flux-general-multi",
  encoding: "linear16",
  sample_rate: 16000,
  eot_threshold: "0.7",
  Authorization: `Token ${process.env.DEEPGRAM_API_KEY}`,
  queryParams: { language_hint: ["en", "es"] },
});

connection.connect();
await connection.waitForOpen();
```

```java title="Java"
import com.deepgram.DeepgramClient;
import com.deepgram.resources.listen.v2.types.ListenV2Configure;
import com.deepgram.resources.listen.v2.websocket.V2ConnectOptions;
import com.deepgram.resources.listen.v2.websocket.V2WebSocketClient;
import com.deepgram.types.ListenV2Encoding;
import com.deepgram.types.ListenV2EotThreshold;
import com.deepgram.types.ListenV2Model;
import com.deepgram.types.ListenV2SampleRate;
import java.util.List;
import java.util.concurrent.TimeUnit;

DeepgramClient client = DeepgramClient.builder().build();

V2ConnectOptions options = V2ConnectOptions.builder()
    .model(ListenV2Model.FLUX_GENERAL_MULTI)
    .encoding(ListenV2Encoding.LINEAR16)
    .sampleRate(ListenV2SampleRate.of(16000))
    .eotThreshold(ListenV2EotThreshold.of("0.7"))
    .build();

V2WebSocketClient wsClient = client.listen().v2().v2WebSocket();
wsClient.connect(options).get(10, TimeUnit.SECONDS);

// Set language hints for the session.
wsClient.sendConfigure(
    ListenV2Configure.builder()
        .languageHints(List.of("en", "es"))
        .build()
).get(5, TimeUnit.SECONDS);
```

```text title="Direct WebSocket"
wss://api.deepgram.com/v2/listen?model=flux-general-multi&language_hint=en&language_hint=es&eot_threshold=0.7&encoding=linear16&sample_rate=16000
```
:::

**Best for:** Multilingual call centers, global voice agents, code-switching scenarios

See the [Language Prompting guide](/guides/streaming-audio-flux-language-prompting) for full details on language hint usage.

## Related Resources

- [Getting Started with Flux](/guides/streaming-audio-flux-quickstart) - Quickstart guide with basic configuration
- [Configure Control Message](/guides/streaming-audio-flux-configure) - Update configuration mid-stream without reconnecting
- [Flux State Machine](/guides/streaming-audio-flux-state) - Understanding turn events and state transitions
- [Eager End-of-Turn Optimization](/guides/streaming-audio-flux-voice-agent-eager-eot) - Deep dive on eager mode implementation
- [Build a Voice Agent](/guides/streaming-audio-flux-agent) - Complete voice agent implementation guide
- [Migrating from Nova-3](/guides/streaming-audio-flux-nova-3-migration) - Migration guide with configuration examples

## Related pages

- [Getting Started with Flux](./streaming-audio-flux-quickstart.md)
- [Flux Feature Overview](./streaming-audio-flux-feature-overview.md)
- [Template Apps](./streaming-audio-flux-template-apps.md)
- [Flux Multilingual & Language Prompting](./streaming-audio-flux-language-prompting.md)
- [Build a Flux-enabled Voice Agent](./streaming-audio-flux-agent.md)
- [Understanding the Flux State Machine](./streaming-audio-flux-state.md)
- [Control Messages](./streaming-audio-control-messages.md)
- [Migrating](./streaming-audio-migrating.md)
- [Tips & Tricks](./streaming-audio-tips-tricks.md)

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