Struct StreamDelta 

pub struct StreamDelta {
    pub role: Option<MessageRole>,
    pub content: Option<String>,
    pub thinking: Option<ThinkingDelta>,
    pub tool_calls: Option<Vec<ToolCallDelta>>,
    pub function_call: Option<FunctionCallDelta>,
    pub audio: Option<AudioDelta>,
}

Streaming delta content

Fields

role: Option<MessageRole>

Role (usually only appears in first chunk)

content: Option<String>

Content delta

thinking: Option<ThinkingDelta>

Thinking/reasoning delta (for thinking-enabled models)

When streaming from thinking models, thinking content may arrive before or alongside the main content. Use this field to track the model’s reasoning process in real-time.

tool_calls: Option<Vec<ToolCallDelta>>

Tool call delta

function_call: Option<FunctionCallDelta>

Function call delta (backward compatibility)

audio: Option<AudioDelta>

Audio output delta.

Implementations

impl ChatDelta

pub fn has_thinking(&self) -> bool

Check if this delta contains thinking content

pub fn thinking_content(&self) -> Option<&str>

Get thinking content if present

Trait Implementations

impl Clone for ChatDelta

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChatDelta

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChatDelta

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ChatDelta

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ChatDelta

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.