Struct Usage 

pub struct Usage {
    pub input_tokens: u32,
    pub output_tokens: u32,
    pub cached_input_tokens: u32,
    pub cache_creation_input_tokens: u32,
    pub served_speed: Option<ServedSpeed>,
}

Fields

input_tokens: u32

Total input tokens reported by the provider.

output_tokens: u32

cached_input_tokens: u32

Portion of input_tokens billed at a cached-input rate, when reported.

cache_creation_input_tokens: u32

Portion of input_tokens spent creating provider-side prompt cache entries.

served_speed: Option<ServedSpeed>

Which speed tier actually served the request, when the provider says.

Requesting a premium tier does not guarantee getting one: Anthropic serves claude-opus-4-6 at standard speed without erroring, and OpenAI downgrades priority requests under a sharp traffic ramp. Both bill the tier they actually ran, so this is the field that says whether the premium request was honoured.

None when the provider reported no tier — which is the normal case for every provider and model that has no premium tier to begin with.

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<(), Error>

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<Usage, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Usage

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

where __S: Serializer,

Serialize this value into the given Serde serializer.