Struct Usage 

#[non_exhaustive]
pub struct Usage {
    pub input_tokens: u32,
    pub output_tokens: u32,
    pub cache_creation_input_tokens: Option<u32>,
    pub cache_read_input_tokens: Option<u32>,
    pub cache_creation: Option<CacheCreationBreakdown>,
    pub server_tool_use: Option<ServerToolUseUsage>,
    pub service_tier: Option<ServiceTier>,
    pub inference_geo: Option<String>,
}

Token usage and related counters returned on every response.

#[non_exhaustive] because Anthropic adds fields here regularly (cache_creation, server_tool_use, service_tier are recent additions).

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

input_tokens: u32

Number of input tokens billed.

output_tokens: u32

Number of output tokens billed.

cache_creation_input_tokens: Option<u32>

Tokens written to the prompt cache on this request.

cache_read_input_tokens: Option<u32>

Tokens read from the prompt cache on this request.

cache_creation: Option<CacheCreationBreakdown>

Per-TTL breakdown of cache writes (5-minute vs 1-hour).

server_tool_use: Option<ServerToolUseUsage>

Counters for server-side tool usage (e.g. web search).

service_tier: Option<ServiceTier>

Service tier the request actually ran on.

inference_geo: Option<String>

Inference geography the request was routed to (e.g. "not_available", region codes when reported). Open string for forward-compat.

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 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 Eq for Usage

impl StructuralPartialEq for Usage