Struct Usage 

pub struct Usage {
    pub prompt_tokens: u32,
    pub completion_tokens: u32,
    pub total_tokens: u32,
    pub cost_usd: Option<f64>,
    pub prompt_tokens_details: Option<PromptTokensDetails>,
    pub cache_creation_tokens: Option<u32>,
}

Token accounting echoed on every response. cost_usd is an llmleaf addition and is absent when the model has no known price.

Fields

prompt_tokens: u32

completion_tokens: u32

total_tokens: u32

cost_usd: Option<f64>

prompt_tokens_details: Option<PromptTokensDetails>

Prompt-cache hit accounting (OpenAI usage.prompt_tokens_details). Absent when the upstream reported no caching; Usage::cached_tokens flattens it to a plain count.

cache_creation_tokens: Option<u32>

Input tokens written to the provider’s prompt cache this request — a cache write (creation). An llmleaf extension (Anthropic reports it; OpenAI/OpenRouter do not); absent when there were none.

Implementations

impl Usage

pub fn cached_tokens(&self) -> u32

Prompt tokens served from the provider’s cache this request — a cache read (hit). 0 when the upstream reported no caching.

pub fn cache_writes(&self) -> u32

Input tokens written to the provider’s cache this request — a cache write (creation). 0 when there were none (or the provider does not report writes).

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<'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 PartialEq for Usage

fn eq(&self, other: &Usage) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

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.

impl StructuralPartialEq for Usage