Gemini 3.8 Flash - GENGEN API

Gemini 3.8 Flash supports text generation and image, audio, and video understanding through Chat Completions and Responses. Reasoning defaults to medium. Use low, medium, or high; minimal and thinking budgets are not supported. Chat Completions and Responses both support synchronous output and SSE streaming.

Model ID

gemini-3.8-flash

Pass this exact public ID in the top-level model field. Do not substitute an upstream provider alias.

Supported modes

chat_completions
responses_api
visual_understanding
text_generation

Inputs

Text
Image
Video
Audio

Outputs

Text

Capabilities

Not specified

Additional capabilities

Chat completions
Function calling
Code execution
Computer use
Responses API
Video understanding
SSE streaming
Multimodal understanding
Reasoning See Function calling and Gemini tools for tool declarations, result submission, and provider-specific capabilities.

Technical details

Property	Value
Provider	`google-agent-platform`
Modality	`reasoning`
Processing	`Synchronous response`
Endpoint	`/api/gengen/v1/chat/completions`
Context window	`1M tokens`
Streaming	`Supported (Server-Sent Events)`
Max input tokens	`1,048,576`
Max output tokens	`65,536`

Availability and final customer prices can change. Check the Dashboard model catalog before production use.

See the API reference overview for authentication, request conventions, and response schemas.