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 (real-time price from the bundled pricing dataset); it is null/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-shaped (usage.prompt_tokens_details). Absent when the upstream reported no caching. cached_tokens is how many of prompt_tokens were a cache read.

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/0 when there was none.

Implementations

impl Usage

pub fn cost_usd(&self) -> f64

Returns the value of cost_usd, or the default value if cost_usd is unset.

pub fn cache_creation_tokens(&self) -> u32

Returns the value of cache_creation_tokens, or the default value if cache_creation_tokens is unset.

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 Copy for Usage

impl Debug for Usage

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

Formats the value using the given formatter.

impl Default for Usage

fn default() -> Self

Returns the “default value” for a type.

impl Message for Usage

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode(&self, buf: &mut impl BufMut) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited( &self, buf: &mut impl BufMut, ) -> Result<(), EncodeError>

where Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited(buf: impl Buf) -> Result<Self, DecodeError>

where Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited(&mut self, buf: impl Buf) -> Result<(), DecodeError>

where Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for Usage

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Usage