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Model detail

Gemini 3.5 Flash

Provided by Google
Pay-as-you-go

Gemini 3.5 Flash is Google's high-efficiency multimodal model, bringing near-Pro level coding and reasoning at Flash-tier cost and speed. It is highly optimized for coding proficiency and parallel agentic execution loops, supporting text, image, video, audio, and PDF inputs. Defaults to medium thinking effort for faster and more cost-efficient responses, with full support for thinking levels (minimal, low, medium, high) for fine-grained cost/performance trade-offs.

Model specs

Model ID
gemini-3.5-flash
Context length
1.048576M
Max output
65.536K
I/O modalities
Released
2026-05

02

API endpoints

One MixRoute gateway, OpenAI-compatible

  • Gemini /v1beta/models/{model}:generateContent POST
  • OpenAI-compatible /v1/chat/completions POST

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Pricing

Flat rate, unit: /1M Tokens

Input

$1.5000 /1M Tokens

Completion

$9.0000 /1M Tokens

Cache read

$0.1500 /1M Tokens

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Selection summary

Quickly judge whether it fits your workload

What is this model good for?

Flash-speed intelligence for sub-agent deployment

Gemini 3.5 Flash is sustained frontier-level intelligence optimized for real-world tasks, sub-agent deployment, and multi-step workflows. 1,048,576-token context with 65,536-token max output. Accepts text, image, video, audio, and PDF natively.

What should you check before using it?

1,048,576 context, 65,536 output, multimodal by default

Supports caching, thinking, structured outputs, function calling, code execution, and search grounding. Knowledge cutoff: 2025-01-01. Released 2026-05.

Why use it through MixRoute?

Drop-in via Google Gen AI SDK or OpenAI-compatible endpoint

Use the Google Gen AI SDK or call through MixRoute's OpenAI-compatible endpoint. Supports batch API, flex inference, and priority inference for production workloads.

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Capabilities & compatibility

Unconfirmed capabilities stay "Unknown," no guesses

Available:

Tool calling

Gemini 3.5 Flash supports function and tool calls.

EX Send a tools definition; the response returns tool_calls to execute and feed results back.
Available:

Structured output

Gemini 3.5 Flash can produce JSON-formatted output on demand.

EX response_format: { type: "json_schema" } forces valid JSON output.
Available:

Streaming

Gemini 3.5 Flash supports streamed responses.

EX stream: true streams tokens incrementally, so chat UIs render as they arrive.
Available:

Prompt caching

Gemini 3.5 Flash supports prompt caching under supported routing conditions.

EX Keep the system prompt and tool definitions at the start of the request; repeated prefixes are automatically billed at the cache-read rate.
Available:

Vision input

Gemini 3.5 Flash can process image inputs alongside text.

EX Pass a base64-encoded image in a image_url content part alongside text messages.
Available:

OpenAI SDK

Call Gemini 3.5 Flash through MixRoute's OpenAI-compatible endpoint.

EX Change base_url to https://api.mixroute.ai/v1; everything else follows the OpenAI style.

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Token cost estimator

Live estimate from this page's pricing, not an actual bill

Share of the same prefix read repeatedly, up to 100%

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FAQ

Gemini 3.5 Flash: Gemini 3.5 Flash provides sustained frontier-level intelligence optimized for
real-world tasks at a higher speed and lower cost. Designed for the agentic era,
it excels at sub-agent deployment, multi-. 1,048,576-token context window.

One endpoint, a testable decision

Test this model and alternate routes with the same request format

Start from a real workload, then let quality, total cost, and failure conditions decide whether to send production traffic.

Create an API key View integration docs