IMPORTANT: In July 2025, we stopped releasing new versions of KTX modules, and we removed the KTX libraries from the Firebase Android BoM (v34.0.0). If you use KTX APIs from the previously released KTX modules, we recommend that you migrate your app to use KTX APIs from the main modules instead. For details, see the FAQ about this initiative.

GenerationConfig.Builder

class GenerationConfig.Builder

Builder for creating a GenerationConfig.

Mainly intended for Java interop. Kotlin consumers should use generationConfig for a more idiomatic experience.

See also
`generationConfig`

Summary

Public constructors
`Builder()`

Public functions
`GenerationConfig`	`build()` Create a new `GenerationConfig` with the attached arguments.
`GenerationConfig.Builder`	`setCandidateCount(candidateCount: Int?)` This function is deprecated. `candidateCount` is unsupported in Gemini 3.x and later models
`GenerationConfig.Builder`	`setFrequencyPenalty(frequencyPenalty: Float?)` This function is deprecated. `frequencyPenalty` is unsupported in Gemini 3.x and later models
`GenerationConfig.Builder`	`setImageConfig(imageConfig: ImageConfig?)`
`GenerationConfig.Builder`	`setMaxOutputTokens(maxOutputTokens: Int?)`
`GenerationConfig.Builder`	`setPresencePenalty(presencePenalty: Float?)` This function is deprecated. `presencePenalty` is unsupported in Gemini 3.x and later models
`GenerationConfig.Builder`	`setResponseMimeType(responseMimeType: String?)`
`GenerationConfig.Builder`	`setResponseModalities(responseModalities: List<ResponseModality>?)`
`GenerationConfig.Builder`	`setResponseSchema(responseSchema: Schema?)`
`GenerationConfig.Builder`	`setResponseSchemaJson(responseSchemaJson: JsonSchema<*>?)`
`GenerationConfig.Builder`	`setSpeechConfig(speechConfig: SpeechConfig?)`
`GenerationConfig.Builder`	`setStopSequences(stopSequences: List<String>?)`
`GenerationConfig.Builder`	`setTemperature(temperature: Float?)` This function is deprecated. `temperature` is unsupported in Gemini 3.x and later models
`GenerationConfig.Builder`	`setThinkingConfig(thinkingConfig: ThinkingConfig?)`
`GenerationConfig.Builder`	`setTopK(topK: Int?)` This function is deprecated. `topK` is unsupported in Gemini 3.x and later models
`GenerationConfig.Builder`	`setTopP(topP: Float?)` This function is deprecated. `topP` is unsupported in Gemini 3.x and later models

Public properties
`Int?`	`candidateCount` Deprecated.
`Float?`	`frequencyPenalty` Deprecated.
`ImageConfig?`	`imageConfig` See `GenerationConfig.imageConfig`.
`Int?`	`maxOutputTokens` See `GenerationConfig.maxOutputTokens`.
`Float?`	`presencePenalty` Deprecated.
`JsonSchema<*>?`	`responseJsonSchema` See `GenerationConfig.responseJsonSchema`
`String?`	`responseMimeType` See `GenerationConfig.responseMimeType`.
`List<ResponseModality>?`	`responseModalities` See `GenerationConfig.responseModalities`.
`Schema?`	`responseSchema` See `GenerationConfig.responseSchema`.
`SpeechConfig?`	`speechConfig` See `GenerationConfig.speechConfig`.
`List<String>?`	`stopSequences` See `GenerationConfig.stopSequences`.
`Float?`	`temperature` Deprecated.
`ThinkingConfig?`	`thinkingConfig`
`Int?`	`topK` Deprecated.
`Float?`	`topP` Deprecated.

Public constructors

Builder

Builder()

Public functions

build

fun build(): GenerationConfig

Create a new GenerationConfig with the attached arguments.

setCandidateCount

fun setCandidateCount(candidateCount: Int?): GenerationConfig.Builder

setFrequencyPenalty

fun setFrequencyPenalty(frequencyPenalty: Float?): GenerationConfig.Builder

setImageConfig

fun setImageConfig(imageConfig: ImageConfig?): GenerationConfig.Builder

setMaxOutputTokens

fun setMaxOutputTokens(maxOutputTokens: Int?): GenerationConfig.Builder

setPresencePenalty

fun setPresencePenalty(presencePenalty: Float?): GenerationConfig.Builder

setResponseMimeType

fun setResponseMimeType(responseMimeType: String?): GenerationConfig.Builder

setResponseModalities

fun setResponseModalities(responseModalities: List<ResponseModality>?): GenerationConfig.Builder

setResponseSchema

fun setResponseSchema(responseSchema: Schema?): GenerationConfig.Builder

setResponseSchemaJson

fun setResponseSchemaJson(responseSchemaJson: JsonSchema<*>?): GenerationConfig.Builder

setSpeechConfig

fun setSpeechConfig(speechConfig: SpeechConfig?): GenerationConfig.Builder

setStopSequences

fun setStopSequences(stopSequences: List<String>?): GenerationConfig.Builder

setTemperature

fun setTemperature(temperature: Float?): GenerationConfig.Builder

setThinkingConfig

fun setThinkingConfig(thinkingConfig: ThinkingConfig?): GenerationConfig.Builder

setTopK

fun setTopK(topK: Int?): GenerationConfig.Builder

setTopP

fun setTopP(topP: Float?): GenerationConfig.Builder

Public properties

candidateCount

var candidateCount: Int?

Deprecated. See GenerationConfig.candidateCount.

frequencyPenalty

var frequencyPenalty: Float?

Deprecated. See GenerationConfig.frequencyPenalty

imageConfig

var imageConfig: ImageConfig?

See GenerationConfig.imageConfig.

maxOutputTokens

var maxOutputTokens: Int?

See GenerationConfig.maxOutputTokens.

presencePenalty

var presencePenalty: Float?

Deprecated. See GenerationConfig.presencePenalty

responseJsonSchema

var responseJsonSchema: JsonSchema<*>?

See GenerationConfig.responseJsonSchema

responseMimeType

var responseMimeType: String?

See GenerationConfig.responseMimeType.

responseModalities

var responseModalities: List<ResponseModality>?

See GenerationConfig.responseModalities.

responseSchema

var responseSchema: Schema?

See GenerationConfig.responseSchema.

speechConfig

var speechConfig: SpeechConfig?

See GenerationConfig.speechConfig.

stopSequences

var stopSequences: List<String>?

See GenerationConfig.stopSequences.

temperature

var temperature: Float?

Deprecated. See GenerationConfig.temperature.

thinkingConfig

var thinkingConfig: ThinkingConfig?

topK

var topK: Int?

Deprecated. See GenerationConfig.topK.

topP

var topP: Float?

Deprecated. See GenerationConfig.topP.