Struct Usage 

pub struct Usage {
    pub input_tokens: u32,
    pub output_tokens: u32,
    pub cache_creation_input_tokens: u32,
    pub cache_read_input_tokens: u32,
}

Token usage reported by the provider on a non-streaming response (or as the final event of a stream). Fields default to 0 on providers that don’t surface that breakdown.

Fields

input_tokens: u32

Tokens in the prompt (system + history + user input).

output_tokens: u32

Tokens in the assistant’s reply.

cache_creation_input_tokens: u32

Anthropic-only — tokens written to the prompt cache.

cache_read_input_tokens: u32

Anthropic-only — tokens served from the prompt cache.

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 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 Copy for Usage