Struct GenerationConfig 

pub struct GenerationConfig {
    pub response_modalities: Option<Vec<Modality>>,
    pub speech_config: Option<SpeechConfig>,
    pub temperature: Option<f32>,
    pub top_p: Option<f32>,
    pub top_k: Option<u32>,
    pub max_output_tokens: Option<u32>,
    pub thinking_config: Option<ThinkingConfig>,
    pub enable_affective_dialog: Option<bool>,
    pub media_resolution: Option<MediaResolution>,
    pub seed: Option<u32>,
    pub response_mime_type: Option<String>,
    pub response_json_schema: Option<Value>,
}

Generation config sent in the setup message.

Fields

response_modalities: Option<Vec<Modality>>

Output modalities (Text, Audio, Image).

speech_config: Option<SpeechConfig>

Speech/voice configuration for audio output.

temperature: Option<f32>

Sampling temperature (0.0 = deterministic, 2.0 = max randomness).

top_p: Option<f32>

Top-p (nucleus) sampling threshold.

top_k: Option<u32>

Top-k sampling: number of top tokens to consider.

max_output_tokens: Option<u32>

Maximum number of output tokens.

thinking_config: Option<ThinkingConfig>

Thinking/reasoning configuration (Gemini 2.5+).

enable_affective_dialog: Option<bool>

Enable emotionally expressive dialog.

media_resolution: Option<MediaResolution>

Resolution for image/video inputs.

seed: Option<u32>

Random seed for deterministic generation.

response_mime_type: Option<String>

MIME type for structured output (e.g., "application/json", "text/x.enum").

response_json_schema: Option<Value>

JSON Schema for structured output. Requires response_mime_type = "application/json".

Trait Implementations

impl Clone for GenerationConfig

fn clone(&self) -> GenerationConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GenerationConfig

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

Formats the value using the given formatter.

impl Default for GenerationConfig

fn default() -> GenerationConfig

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for GenerationConfig

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for GenerationConfig

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

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 GenerationConfig