Struct TokenUsage 

pub struct TokenUsage {
    pub prompt_tokens: u32,
    pub completion_tokens: u32,
    pub total_tokens: u32,
    pub cache_read_tokens: u32,
    pub cache_creation_tokens: u32,
}

Token usage counts for a single completion request or turn.

Fields

prompt_tokens: u32

Tokens consumed by the prompt (input messages).

completion_tokens: u32

Tokens generated by the model (output/response).

total_tokens: u32

Total tokens (prompt + completion).

cache_read_tokens: u32

Prompt tokens served from the provider’s cache.

cache_creation_tokens: u32

Prompt tokens written to the provider’s cache.

Implementations

impl TokenUsage

pub fn cost(&self, pricing: &ModelPricing) -> Option<Decimal>

Compute the cost of this usage given per-token pricing.

Non-cached input tokens are charged at the prompt rate, cached reads at cache_read (falling back to prompt), and cache writes at cache_write (falling back to prompt). Returns None if pricing has no prompt or completion prices.

Trait Implementations

impl Clone for TokenUsage

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TokenUsage

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

Formats the value using the given formatter.

impl Default for TokenUsage

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for TokenUsage

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<TurnUsage> for TokenUsage

fn from(u: TurnUsage) -> Self

Converts to this type from the input type.

impl Serialize for TokenUsage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.