Struct BetaHeader 

pub struct BetaHeader {
    pub key: String,
    pub value: String,
    pub max_output_tokens: Option<usize>,
    pub input_context: Option<usize>,
}

HTTP header that, when sent on a request, unlocks enhanced limits for a model.

A BetaHeader is a leaf of a ModelSpec: it names the header to send (key/value) and records the new ceiling for max_output_tokens and/or input_context that the header makes available. An absent override field means that header does not move that limit; the model’s base value still applies. Callers consult these via ModelRegistry::get_max_output_tokens_with_beta and ModelRegistry::get_input_context_with_beta.

Fields

key: String

HTTP header name (e.g., “anthropic-beta”).

value: String

Header value (e.g., “context-1m-2025-08-07”).

max_output_tokens: Option<usize>

Overridden max output tokens when this header is active.

input_context: Option<usize>

Overridden input context when this header is active.

Trait Implementations

impl Clone for BetaHeader

fn clone(&self) -> BetaHeader

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BetaHeader

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for BetaHeader

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for BetaHeader

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

where __S: Serializer,

Serialize this value into the given Serde serializer.