Struct CompletionResponse 

pub struct CompletionResponse {
    pub choice: ModelChoice,
    pub reasoning: Option<String>,
    pub usage: Option<Usage>,
}

The full response returned by a CompletionModel.

Fields

choice: ModelChoice

What the model decided to do this turn.

This is always the model’s final answer — a chain-of-thought / “thinking” trace, if the provider returns one, never ends up here. See reasoning instead.

reasoning: Option<String>

The model’s raw reasoning / chain-of-thought trace, if the provider exposes one for this request (e.g. Anthropic extended thinking, Gemini “thinking” parts, DeepSeek’s reasoning_content) and the model actually produced one this turn.

Most callers can ignore this field entirely — choice is always the straight answer. It’s here for callers who specifically want to show or log the reasoning trace alongside the answer.

usage: Option<Usage>

Token usage, if the provider reported it.

Trait Implementations

impl Clone for CompletionResponse

fn clone(&self) -> CompletionResponse

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CompletionResponse

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

Formats the value using the given formatter.