Struct ThinkingConfig 

pub struct ThinkingConfig {
    pub thinking_budget: Option<i32>,
    pub include_thoughts: Option<bool>,
    pub thinking_level: Option<ThinkingLevel>,
}

Configuration for thinking (Gemini 2.5 and Gemini 3 series)

• For Gemini 2.5 models, use thinking_budget and include_thoughts.
• For Gemini 3 models, use thinking_level (mutually exclusive with thinking_budget).

Fields

thinking_budget: Option<i32>

The thinking budget (number of thinking tokens)

• Set to 0 to disable thinking
• Set to -1 for dynamic thinking (model decides)
• Set to a positive number for a specific token budget

Model-specific ranges:

• 2.5 Pro: 128 to 32768 (cannot disable thinking)
• 2.5 Flash: 0 to 24576
• 2.5 Flash Lite: 512 to 24576

include_thoughts: Option<bool>

Whether to include thought summaries in the response

When enabled, the response will include synthesized versions of the model’s raw thoughts, providing insights into the reasoning process.

thinking_level: Option<ThinkingLevel>

The thinking level (Required for Gemini 3)

Gemini 3 uses thinking_level (Low/High) which is mutually exclusive with thinking_budget

Implementations

impl ThinkingConfig

pub fn new() -> Self

Create a new thinking config with default settings

pub fn with_thinking_budget(self, budget: i32) -> Self

Set the thinking budget

pub fn with_dynamic_thinking(self) -> Self

Enable dynamic thinking (model decides the budget)

pub fn with_thoughts_included(self, include: bool) -> Self

Include thought summaries in the response

pub fn with_thinking_level(self, level: ThinkingLevel) -> Self

Set the thinking level (Required for Gemini 3)

pub fn dynamic_thinking() -> Self

Create a thinking config that enables dynamic thinking with thoughts included

Trait Implementations

impl Clone for ThinkingConfig

fn clone(&self) -> ThinkingConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ThinkingConfig

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

Formats the value using the given formatter.

impl Default for ThinkingConfig

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ThinkingConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for ThinkingConfig

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

where __S: Serializer,

Serialize this value into the given Serde serializer.