Struct Compat 

#[non_exhaustive]
pub struct Compat {
    pub reasoning_field: Option<String>,
    pub adaptive_thinking: bool,
    pub thinking_off: Option<String>,
    pub mid_conversation_system: bool,
    pub rejects_forced_tool_choice: bool,
    pub binds_context: bool,
    pub prompt_cache_options: bool,
    pub chat_tools_need_reasoning_off: bool,
    pub prefill: bool,
}

Wire facts the encoders read that no portable field holds. Each defaults to false or None, which is what a model the field does not concern has. An override file sets each one by its field name under a row’s rig object, and a spec built in code sets it with the with_* setter of the same name.

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.

reasoning_field: Option<String>

The field an OpenAI Chat Completions assistant message must carry its reasoning under, such as reasoning_content.

adaptive_thinking: bool

Anthropic: an effort level goes with thinking: {"type": "adaptive"}.

thinking_off: Option<String>

Anthropic: the thinking.type that turns reasoning off, where it is not disabled.

mid_conversation_system: bool

Anthropic: the model takes role: "system" inside messages.

rejects_forced_tool_choice: bool

Anthropic: the model answers a forced tool_choice with an error.

binds_context: bool

Anthropic: the model binds its thinking to the request’s tools and system prompt.

prompt_cache_options: bool

OpenAI: the prompt cache takes prompt_cache_options, not prompt_cache_retention.

chat_tools_need_reasoning_off: bool

OpenAI: Chat Completions takes the model’s tools only while its reasoning is off.

prefill: bool

The model continues a request that ends in an assistant message (a prefill) from where that message stops, instead of refusing it, as Anthropic’s models before Claude 4.6 do while their reasoning is off. Unknown is false.

Implementations

impl Compat

pub fn with_reasoning_field(self, field: impl Into<String>) -> Self

These facts with field as the Chat Completions assistant message’s reasoning field.

pub fn with_prefill(self, on: bool) -> Self

These facts with prefill continuation set to on.

Trait Implementations

impl Clone for Compat

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Compat

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

Formats the value using the given formatter.

impl Default for Compat

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Compat

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Compat

impl PartialEq for Compat

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Compat

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 Compat