Struct ChatCompletionMessage 

pub struct ChatCompletionMessage {
    pub role: Role,
    pub audio: Option<ChatCompletionAudio>,
    pub content: Option<String>,
    pub reasoning_content: Option<String>,
    pub reasoning: Option<String>,
    pub tool_calls: Option<Vec<ChatCompletionMessageToolCall>>,
    pub refusal: Option<String>,
    pub annotations: Option<Vec<Annotation>>,
}

Fields

role: Role

The role of the author of this message. This shall always be Role::Assistant

audio: Option<ChatCompletionAudio>

If the audio output modality is requested, this object contains data about the audio response from the model. Learn more from OpenAI.

content: Option<String>

The contents of the message.

reasoning_content: Option<String>

For thinking models: the reasoning contents of the assistant message, before the final answer.

reasoning: Option<String>

vLLM: the reasoning contents of the assistant message, under the key vLLM actually emits.

vLLM accepts reasoning_content on the way in but serializes the chain of thought as reasoning on the way out — in its ChatMessage the two names are aliases of one field, and reasoning is the serialization name. Current vLLM does not emit reasoning_content in responses, so for a vLLM backend the field above stays None and this one carries the chain of thought. Map it back onto reasoning_content when feeding it into a follow-up request.

tool_calls: Option<Vec<ChatCompletionMessageToolCall>>

The tool calls generated by the model, such as function calls. Tool calls deserialization is not supported yet.

refusal: Option<String>

The refusal message generated by the model.

annotations: Option<Vec<Annotation>>

Annotations for the message, when applicable, such as URL citations when the model uses a web search tool.

Trait Implementations

impl Clone for ChatCompletionMessage

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 ChatCompletionMessage

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ChatCompletionMessage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ChatCompletionMessage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.