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Gemini 3.5 Flash: AI Large Language Models

Gemini 3.5 Flash is a high-speed, multimodal language model built for real-time text generation, supporting text and image inputs natively. Token-based pricing: $0.60/M input tokens and $3.60/M output tokens. Two endpoints: standard async (/gemini-3-5-flash) and live streaming (/gemini-3-5-flash/stream) via SSE.

Interactive model controls

Gemini 3.5 Flash is a high-speed, multimodal language model built for real-time text generation, supporting text and image inputs natively. Token-based pricing: $0.60/M input tokens and $3.60/M output tokens. Two endpoints: standard async (/gemini-3-5-flash) and live streaming (/gemini-3-5-flash/stream) via SSE.

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Overview

About this model

Gemini 3.5 Flash is a high-speed, multimodal language model optimized for rapid text generation and real-time image understanding. It provides high performance with exceptionally low latency. Token-based pricing: $0.60/M input tokens and $3.60/M output tokens.

1Real-time customer support assistants
2Multimodal image analysis and captioning
3Fast content summarization and rewriting
4Quick code snippet generation and debugging
5General conversational agents
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Pricing & Value

Cost analysis

muapiapp$0.60/M input, $3.60/M output tokens

Fast, high-quality, token-based pricing with an upfront minimum of $0.0001.

Google (official)$0.075/M input, $0.30/M output tokens (under 128k context)

Official API pricing. We scale our rates to match standard Gemini rates with preserved developer margin.

** Competitor pricing is estimated based on similar model architectures and usage tiers.

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Technical Details

Configuration schema

Promptstring

The user message or instruction for the model.

Default ValueSummarize the key points of the attached image.
Image URLstring

Optional image URL to include as multimodal input.

Default Valueundefined
System Promptstring

Optional system-level instruction to guide model behavior.

Default ValueYou are a helpful assistant that responds concisely.
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Implementation Guide

Developer documentation

How to Use Gemini 3.5 Flash

  1. Prepare your Prompt: Write a clear text instruction or question under the prompt field.
  2. Include an Image (Optional): If you want to analyze an image, pass the image's direct URL under the image_url field.
  3. Provide System instructions (Optional): Pass system-level constraints under the system_prompt field.
  4. Submit Request: Send the payload to the /gemini-3-5-flash endpoint for async processing, or use /gemini-3-5-flash/stream to receive tokens in real time.
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Common Questions

Frequently asked

What is the pricing model?

Billing is token-based. We charge $0.60/M input tokens and $3.60/M output tokens, with an upfront minimum charge of $0.0001 per call. The final price is adjusted post-call from actual token usage.

Does Gemini 3.5 Flash support streaming?

Yes. A streaming endpoint is available at `/gemini-3-5-flash/stream` which uses Server-Sent Events (SSE) to stream back the token responses.