Enum ReasoningEffort 

pub enum ReasoningEffort {
    Minimal,
    Low,
    Medium,
    High,
    XHigh,
    Max,
}

A reasoning-effort level gglib is willing to put on the wire.

This enum is where gglib is deliberately stricter than upstream

InferenceConfig::extract_client_sampling’s coercion doctrine is “accept what upstream accepts and reject what upstream rejects, so gglib never becomes the stricter of the two”. A closed enum breaks that rule for this one field, on purpose, and the exception is argued rather than assumed — see InferenceConfig::reasoning_effort, which carries the argument.

The levels

The six are llama-server’s own documented set, taken from its --reasoning-effort help text on the pinned build. They are offered levels, not honoured ones: a template that never branches on the variable ignores every one of them, and even a template that reads it may only act on some (upstream’s own tests show DeepSeek-V4 rendering something special for "max" and nothing at all for "high" or "low" — ADR 0007 finding 3).

"none" is not here, and its absence is the decision

llama-server accepts reasoning_effort: "none" and treats it specially: it erases the kwarg rather than passing it through. On gpt-oss the template’s own {%- set reasoning_effort = "medium" %} fallback then fills the hole, so "none" yields medium thinking — confirmed live against the pinned binary, not inferred. Offering it as a level would ship a control whose most obvious value does the opposite of what it reads as. “Stop thinking” is reasoning_budget_tokens: 0, which is sampler-enforced and range-validated upstream. See ADR 0007 finding 4 and decision 4.

Variants

Minimal

The least thinking the template offers.

Low

Below the template’s own middle setting.

Medium

The middle setting, and the value gpt-oss’s template falls back to on its own when no kwarg arrives.

High

Above the middle setting.

XHigh

Serialises as xhigh, one word — not x_high. The wire spelling is llama-server’s, and serde(rename_all = "lowercase") lower-cases the variant name whole rather than splitting on the case boundary the way snake_case would. the_wire_spelling_of_every_level_is_pinned fails if that ever changes.

Max

The most thinking the template offers.

Implementations

impl ReasoningEffort

pub const ALL: [Self; 6]

Every level, weakest first.

The order is the --reasoning-effort help text’s, which is also the only ordering the levels have — nothing in llama.cpp compares them, and a template is free to treat low and high identically.

pub const fn as_str(self) -> &'static str

The wire spelling, identical to what serde emits.

Both spellings exist because both are needed — serde writes the request body, and this reads a client’s string without a round trip through serde_json — and they are pinned equal by test rather than by hope.

pub fn from_wire(s: &str) -> Option<Self>

Read a level from a client’s string, or None if it is not one.

Case-insensitive, because the levels are a closed vocabulary and "HIGH" can only have meant one thing. Note what is not here: "none" is not a level (see the type docs), so it lands in the None arm along with "banana" and is reported as a rejection by the caller.

pub fn wire_vocabulary() -> String

The accepted levels, rendered for an error message.

Trait Implementations

impl Clone for ReasoningEffort

fn clone(&self) -> ReasoningEffort

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReasoningEffort

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ReasoningEffort

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for ReasoningEffort

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

Formats the value using the given formatter.

impl Hash for ReasoningEffort

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ReasoningEffort

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

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for ReasoningEffort

impl Eq for ReasoningEffort

impl StructuralPartialEq for ReasoningEffort