Model Guide

Gemini 3 Pro Official

Model ID: gemini-3-pro-official

Vendor: Google (Gemini)Modalities: ChatPrice: Input $1.60/1M, Output $9.60/1MUpdated: 2026-05-02

Gemini 3 Pro Official by Google (Gemini) is designed for chat, reasoning, and tool-calling workflows with ToAPIs-aligned integration contracts.

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Model Overview

Quick Answer

Supports Chat Completions for low-friction SDK migration.
Supports streaming and tool-calling for agent workflows.
Stabilize system/messages parameters before production rollout.

Gemini 3 Pro Official Model Features

Core Section

Core capabilities and practical engineering value

Chat and reasoning

Supports multi-turn context and structured outputs.

Streaming output

SSE token streaming for real-time UX.

Tool calling

Compose retrieval/execution workflows with tools.

How to Use Gemini 3 Pro Official API

Set Authorization: Bearer <YOUR_API_KEY>.
Call chat endpoint with model, messages, and max_tokens.
Enable stream or tools when needed.
Handle stop_reason for completion or tool continuation.

When to Use

When building coding/Q&A assistants and task agents.
When streaming and tool-calling are required.

Runtime Behavior

API calls are stateless; pass full context via messages.
With stream=true, responses return as SSE events.

Key Parameters

Parameter	Type	Required	Default	Range	Description
model	string	Yes	gemini-3-pro-official	-	Exact model identifier from ToAPIs.
messages	object[]	Yes	-	-	Conversation messages in chronological order.
max_tokens	integer	Yes	-	>=1	Maximum output tokens.
stream	boolean	No	false	-	Enable SSE streaming output.
tools	object[]	No	-	-	Tool/function definitions for tool-calling.

Common Errors

400 invalid_request_error

Trigger: Missing fields or invalid payload types.

Fix: Validate model/messages/max_tokens schema.

Retry: Retry only after payload fix.

401 authentication_error

Trigger: Missing or invalid API key.

Fix: Verify Authorization header and key scope.

Retry: Retry after authentication fix.

FAQ

What is Gemini 3 Pro Official best for?

Best for chat, reasoning, coding, and tool-calling assistant workflows.

Mode Notes

Chat Completions with Gemini 3 Pro Official

OpenAI-compatible chat entrypoint for fast integration.

Mode Parameters

modelmessagestemperaturemax_tokensstream

Best Scenarios

Q&A assistant
Coding copilot
Workflow orchestration

Streaming with Gemini 3 Pro Official

Enable stream for incremental SSE responses.

Mode Parameters

streammessagesmax_tokens

Best Scenarios

Realtime assistant
Terminal output
Incremental rendering

Tool Calling with Gemini 3 Pro Official

Declare tools to trigger external actions.

Mode Parameters

toolstool_choicemessagesmax_tokens

Best Scenarios

Auto test runs
Retrieval QA
Multi-step agents

Gemini 3 Pro Official

Model Overview

Quick Answer

Gemini 3 Pro Official Model Features

Chat and reasoning

Streaming output

Tool calling

How to Use Gemini 3 Pro Official API

When to Use

Runtime Behavior

Key Parameters

Common Errors

400 invalid_request_error

401 authentication_error

FAQ

What is Gemini 3 Pro Official best for?

Mode Notes

Chat Completions with Gemini 3 Pro Official

Streaming with Gemini 3 Pro Official

Tool Calling with Gemini 3 Pro Official

Related APIs

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