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Gemini 3.1 Pro Preview vs Gemini 3.6 Flash

Compare Gemini 3.1 Pro Preview from Google and Gemini 3.6 Flash from Google on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

GoogleGemini 3.1 Pro PreviewGoogleGemini 3.6 Flash
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Google logo
Gemini 3.1 Pro Preview
Google · text, image, video, audio, pdf → text

Gemini 3.1 Pro Preview is designed to further optimize the performance and reliability of the Gemini 3 Pro series, offering improved reasoning capabilities, greater token efficiency, and a more robust, factually consistent user experience. It is optimized for software-engineering behaviors and usability, and is also suitable for agent workflows that require precise tool invocation and reliable multi-step execution, enabling stable operation across a variety of real-world scenarios.

Input$2 /M
Output$12 /M
Cache read$0.5 /M
Details
Google logo
Gemini 3.6 Flash
Google · text, image, video, audio, pdf → text

Gemini 3.6 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 code generation, agentic execution, and spatial reasoning. This model is particularly effective for rapid agentic loops involving complex coding cycles and iterations.

Input$0.75 /M
Output$3.75 /M
Cache read$0.075 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

Gemini 3.1 Pro Preview
Gemini 3.6 Flash
Input /M
$2
$0.75
Output /M
$12
$3.75
Cache read /M
$0.5
$0.075
Context length
1,048,576
1,048,576
Max output
65,536
65,536
Time to First Token
7.5 s
7.7 s
Throughput
101.9 tok/s
168.2 tok/s
Modalities
textimagevideoaudiopdf
textimagevideoaudiopdf
Supported Parameters
thinkingtoolsfunction callingstructured outputswebdeepsearchlong context
thinkingtoolsfunction callingstructured outputsweblong context
API Formats
chat_completions · gemini_api · claude_api
chat_completions · gemini_api · claude_api
Released
February 19, 2026
July 21, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

gemini-3.1-pro-previewgemini-3.6-flash

Tokens / day

-

Requests / day

-

Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

gemini-3.1-pro-previewgemini-3.6-flash

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

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LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
gemini-3.1-pro-previewgemini-3.6-flash
1440148015201560
Overall
14831487
Coding
15181521
Math
14881503
Hard prompts
15011508
Instruction following
14731480
Multi-turn
14881496
Creative writing
14711481
Longer query
14851499
Chinese
15281530
English
14871490
Vision
gemini-3.1-pro-previewgemini-3.6-flash
12601280130013201340
Overall
12801282
OCR
12941301
Diagram
13081310
Homework
13041310
WebDev Arena
gemini-3.1-pro-previewgemini-3.6-flash
1380144015001560
Overall
14471538
React
14381527
HTML
14891547
Gaming
14681550
Simulations
14731553
Data analytics
14061520

Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.

Cost calculator

Estimate your monthly bill for the same workload on each model.

Gemini 3.6 Flash
$101 /mo
Gemini 3.1 Pro Preview
$300 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: Gemini 3.1 Pro Preview, Gemini 3.6 Flash?

Gemini 3.6 Flash: $3.75/M output tokens; Gemini 3.1 Pro Preview: $12/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Gemini 3.1 Pro Preview: 1521; Gemini 3.6 Flash: 1518 (LMArena coding leaderboard).

Which responds faster?

Gemini 3.1 Pro Preview: 7.5s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

Gemini 3.1 Pro Preview accepts 1,048,576 and Gemini 3.6 Flash accepts 1,048,576 input tokens. Maximum output per request is 65,536 tokens on Gemini 3.1 Pro Preview and 65,536 tokens on Gemini 3.6 Flash.

Which one generates tokens faster?

Gemini 3.6 Flash at 168.2 tok/s and Gemini 3.1 Pro Preview at 101.9 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Gemini 3.1 Pro Preview accepts text, image, video, audio and PDF input and supports thinking, tool calling, function calling, structured outputs, web search, deep search and long context; Gemini 3.6 Flash accepts text, image, video, audio and PDF input and supports thinking, tool calling, function calling, structured outputs, web search and long context.

Can I call Gemini 3.1 Pro Preview and Gemini 3.6 Flash with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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