> ## Documentation Index
> Fetch the complete documentation index at: https://docs.galileo.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# SerializedLlmMetrics

***

# Interface: SerializedLlmMetrics

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)

## Extends

* [`SerializedMetrics`](/sdk-api/typescript/reference/types/type-aliases/SerializedMetrics)

## Indexable

```ts theme={null}
[key: string]: undefined | MetricValueType
```

## Properties

### durationNs?

```ts theme={null}
optional durationNs: number;
```

Defined in: [src/types/logging/step.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/step.types.ts)

#### Inherited from

```ts theme={null}
SerializedMetrics.durationNs;
```

***

### numCachedInputTokens?

```ts theme={null}
optional numCachedInputTokens: number;
```

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)

***

### numInputTokens?

```ts theme={null}
optional numInputTokens: number;
```

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)

***

### numOutputTokens?

```ts theme={null}
optional numOutputTokens: number;
```

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)

***

### numReasoningTokens?

```ts theme={null}
optional numReasoningTokens: number;
```

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)

***

### numTotalTokens?

```ts theme={null}
optional numTotalTokens: number;
```

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)

***

### timeToFirstTokenNs?

```ts theme={null}
optional timeToFirstTokenNs: number;
```

Defined in: [src/types/logging/span.types.ts](https://github.com/rungalileo/galileo-js/blob/main/src/types/logging/span.types.ts)