Struct Usage 

pub struct Usage {
    pub prompt_tokens: usize,
    pub completion_tokens: usize,
    pub total_tokens: usize,
    pub cost: f64,
    pub prompt_tokens_details: Option<PromptTokensDetails>,
    pub completion_tokens_details: Option<CompletionTokensDetails>,
}

Fields

prompt_tokens: usize

completion_tokens: usize

total_tokens: usize

cost: f64

prompt_tokens_details: Option<PromptTokensDetails>

OpenAI-compatible prompt-token details, returned by OpenRouter when a provider reports cache activity (Anthropic with cache_control, OpenAI with server-side automatic caching).

completion_tokens_details: Option<CompletionTokensDetails>

OpenAI-compatible completion-token breakdown. OpenRouter includes full usage accounting on every response, so a reasoning-capable route reports here how much of completion_tokens went to hidden reasoning.

Trait Implementations

impl Clone for Usage

fn clone(&self) -> Usage

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Usage

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

Formats the value using the given formatter.

impl Default for Usage

fn default() -> Usage

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Usage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Usage

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

Formats the value using the given formatter.

impl From<&Usage> for Usage

fn from(value: &Usage) -> Usage

Converts to this type from the input type.

impl From<Usage> for Usage

fn from(value: Usage) -> Usage

Converts to this type from the input type.

impl Serialize for Usage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.