Enum ThinkingLevel 

pub enum ThinkingLevel {
    Minimal,
    Low,
    Medium,
    High,
}

Available on crate features gemini and models only.

Native thinking level for Gemini 3 models.

Controls the amount of reasoning effort the model applies. This is the Gemini 3 native thinking control — for Gemini 2.5 budget-based thinking, use ThinkingConfig::with_thinking_budget instead.

Serializes as lowercase per the Gemini API contract (e.g., "low", "high").

Available levels (model support and defaults vary by model):

• Minimal — matches “no thinking” for most queries; model may still think minimally for complex coding tasks. Not supported on Gemini 3.1 Pro.
• Low — minimizes latency and cost; improved for code and agentic tasks that require fewer steps.
• Medium — balanced thinking for most tasks. Default for Gemini 3.5 Flash.
• High — maximizes reasoning depth. Default for Gemini 3 Flash Preview and Gemini 3.1 Pro.

Note: temperature, top_p, and top_k are no longer recommended for Gemini 3.x models — their reasoning is tuned for the default sampling settings. Use thinking_level to control reasoning effort instead.

Variants

Minimal

Minimal reasoning effort. Matches “no thinking” for most queries. Not supported on Gemini 3.1 Pro.

Low

Low reasoning effort. Best for simple instruction following and chat.

Medium

Medium reasoning effort. Balanced thinking for most tasks. Default for Gemini 3.5 Flash.

High

High reasoning effort — maximizes reasoning depth. Default for Gemini 3 Flash Preview and Gemini 3.1 Pro.

Trait Implementations

impl Clone for ThinkingLevel

fn clone(&self) -> ThinkingLevel

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ThinkingLevel

impl Debug for ThinkingLevel

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for ThinkingLevel

fn deserialize<__D>( __deserializer: __D, ) -> Result<ThinkingLevel, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ThinkingLevel

impl PartialEq for ThinkingLevel

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

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.

impl StructuralPartialEq for ThinkingLevel