Struct TokenUsage 

pub struct TokenUsage {
    pub input_tokens: u64,
    pub output_tokens: u64,
    pub reasoning_tokens: Option<u64>,
    pub cached_input_tokens: Option<u64>,
    pub cache_write_input_tokens: Option<u64>,
}

Token counts broken down by direction and special categories.

Fields

input_tokens: u64

Number of tokens in the input (prompt) sent to the model.

output_tokens: u64

Number of tokens in the model’s output (completion).

reasoning_tokens: Option<u64>

Tokens consumed by the model’s internal reasoning, if reported.

cached_input_tokens: Option<u64>

Input tokens served from the provider’s prompt cache, if reported.

cache_write_input_tokens: Option<u64>

Input tokens written into the provider’s prompt cache, if reported.

Implementations

impl TokenUsage

pub fn new(input_tokens: u64, output_tokens: u64) -> Self

Builds token usage with required input and output counts.

pub fn with_reasoning_tokens(self, reasoning_tokens: u64) -> Self

Sets reasoning token count.

pub fn with_cached_input_tokens(self, cached_input_tokens: u64) -> Self

Sets cached input token count.

pub fn with_cache_write_input_tokens( self, cache_write_input_tokens: u64, ) -> Self

Sets cache-write input token count.

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 Default for TokenUsage

fn default() -> TokenUsage

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 PartialEq for TokenUsage

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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.

impl Eq for TokenUsage

impl StructuralPartialEq for TokenUsage