Model detail
Gemini 3 Flash preview
Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance. It delivers near Pro level reasoning and tool use performance with substantially lower latency than larger Gemini variants, making it well suited for interactive development, long running agent loops, and collaborative coding tasks. Compared to Gemini 2.5 Flash, it provides broad quality improvements across reasoning, multimodal understanding, and reliability. The model supports a 1M token context window and multimodal inputs including text, images, audio, video, and PDFs, with text output. It includes configurable reasoning via thinking levels (minimal, low, medium, high), structured output, tool use, and automatic context caching. Gemini 3 Flash Preview is optimized for users who want strong reasoning and agentic behavior without the cost or latency of full scale frontier models.
Model specs
- Model ID
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gemini-3-flash-preview
- Context length
- 1.048576M
- Max output
- 65.536K
- I/O modalities
- Released
- 2025-12
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API endpoints
One MixRoute gateway, OpenAI-compatible
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Gemini
/v1beta/models/{model}:generateContentPOST -
OpenAI-compatible
/v1/chat/completionsPOST
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Pricing
Flat rate, unit: /1M Tokens
Input
$0.5000 /1M Tokens
Completion
$3.0000 /1M Tokens
Cache read
$0.0500 /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 multimodal understanding
Gemini 3 Flash preview is best model for multimodal understanding, powerful agentic and vibe-coding model with richer visuals and deeper interactivity. 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. Released 2025-12.
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
Tool calling
Gemini 3 Flash preview supports function and tool calls.
tools definition; the response returns tool_calls to execute and feed results back.
Structured output
Gemini 3 Flash preview can produce JSON-formatted output on demand.
response_format: { type: "json_schema" } forces valid JSON output.
Streaming
Gemini 3 Flash preview supports streamed responses.
stream: true streams tokens incrementally, so chat UIs render as they arrive.
Prompt caching
Gemini 3 Flash preview supports prompt caching under supported routing conditions.
Vision input
Gemini 3 Flash preview can process image inputs alongside text.
image_url content part alongside text messages.
OpenAI SDK
Call Gemini 3 Flash preview through MixRoute's OpenAI-compatible endpoint.
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 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance.
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.