Struct TokenUsage 

pub struct TokenUsage {
    pub model: String,
    pub input_tokens: u64,
    pub output_tokens: u64,
    pub cached_input_tokens: u64,
    pub total_tokens: u64,
    pub cost_usd: f64,
    pub timestamp: DateTime<Utc>,
}

Token usage information from a single API call.

Fields

model: String

Model identifier (e.g., “anthropic/claude-sonnet-4-20250514”)

input_tokens: u64

Input/prompt tokens

output_tokens: u64

Output/completion tokens

cached_input_tokens: u64

Cached input tokens (Anthropic cache_read_input_tokens, OpenAI prompt_tokens_details.cached_tokens). Subset of input_tokens when reported by the provider; the rate sheet’s cached_input_per_mtok applies to these.

total_tokens: u64

Total tokens (input + output, ignoring the cached subset).

cost_usd: f64

Calculated cost in USD

timestamp: DateTime<Utc>

Timestamp of the request

Implementations

impl TokenUsage

pub fn new( model: impl Into<String>, input_tokens: u64, output_tokens: u64, cached_input_tokens: u64, input_price_per_million: f64, output_price_per_million: f64, cached_input_price_per_million: f64, ) -> Self

Create a new token usage record. Cached input tokens are billed at cached_input_price_per_million; the rest of input_tokens at the standard input_price_per_million. When cached_input_price is 0 the cached subset bills at the standard rate (no discount), so providers that don’t surface a cached rate still produce a sane total.

pub fn cost(&self) -> f64

Get the total cost.

Trait Implementations

impl Clone for TokenUsage

fn clone(&self) -> TokenUsage

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<'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 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.