Struct Usage 

pub struct Usage {
    pub input_tokens: u32,
    pub output_tokens: u32,
    pub prompt_cache_hit_tokens: Option<u32>,
    pub prompt_cache_miss_tokens: Option<u32>,
    pub reasoning_tokens: Option<u32>,
    pub reasoning_replay_tokens: Option<u32>,
    pub server_tool_use: Option<ServerToolUsage>,
}

Token usage metadata for a response.

Fields

input_tokens: u32

output_tokens: u32

prompt_cache_hit_tokens: Option<u32>

prompt_cache_miss_tokens: Option<u32>

reasoning_tokens: Option<u32>

reasoning_replay_tokens: Option<u32>

Approximate input tokens spent re-sending prior reasoning_content across user-message boundaries (V4 §5.1.1 “Interleaved Thinking”).

server_tool_use: Option<ServerToolUsage>

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 Eq for Usage

impl JsonSchema for Usage

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for Usage

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

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Usage