> This page is for NeMo Fabric, version v0.5.0.
> For other versions, use one of these documentation indexes:
> - Latest (v0.4.0) (default): https://docs.nvidia.com/nemo/fabric/latest/llms.txt
> - dev: https://docs.nvidia.com/nemo/fabric/dev/llms.txt
> - v0.5.0: https://docs.nvidia.com/nemo/fabric/v0.5.0/llms.txt
> - v0.4.0: https://docs.nvidia.com/nemo/fabric/v0.4.0/llms.txt
> - v0.3.0: https://docs.nvidia.com/nemo/fabric/v0.3.0/llms.txt
> - v0.2.0: https://docs.nvidia.com/nemo/fabric/v0.2.0/llms.txt
> - v0.1.1: https://docs.nvidia.com/nemo/fabric/v0.1.1/llms.txt
> - v0.1.0: https://docs.nvidia.com/nemo/fabric/v0.1.0/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/fabric/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/fabric/_mcp/server.

# Struct OpenAI Chat Completion Chunk Delta

> Incremental assistant message fields carried by one OpenAI choice.

Generated from `cargo doc --no-deps -p nemo-fabric-core`.

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Incremental assistant message fields carried by one OpenAI choice.

## Fields

### `content: Option<String>`

Incremental text content.

### `refusal: Option<String>`

Incremental refusal content.

### `role: Option<String>`

Incremental message role.

### `function_call: Option<BTreeMap<String, Value>>`

Legacy incremental function-call fields.

### `tool_calls: Option<Vec<BTreeMap<String, Value>>>`

Incremental tool-call fields.

### `extensions: BTreeMap<String, Value>`

Additional OpenAI-compatible delta fields preserved by pass-through.

## Trait Implementations

### `impl Clone for OpenAiChatCompletionChunkDelta`

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#### `clone`

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#### `clone_from`

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### `impl Debug for OpenAiChatCompletionChunkDelta`

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#### `fmt`

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### `impl<'de> Deserialize<'de> for OpenAiChatCompletionChunkDelta`

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#### `deserialize`

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### `impl JsonSchema for OpenAiChatCompletionChunkDelta`

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#### `schema_name`

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#### `schema_id`

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#### `json_schema`

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#### `inline_schema`

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### `impl PartialEq for OpenAiChatCompletionChunkDelta`

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#### `eq`

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#### `ne`

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### `impl Serialize for OpenAiChatCompletionChunkDelta`

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#### `serialize`

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### `impl StructuralPartialEq for OpenAiChatCompletionChunkDelta`

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