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Gemini 3.1 Pro Preview vs Gemini 3.7 Flash

Compare Gemini 3.1 Pro Preview from Google and Gemini 3.7 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 3.7 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 3.7 Flash
Google · text, image, video, audio, pdf → text

Gemini 3.7 Flash is Google’s natively multimodal reasoning model for coding, agents, web development, and knowledge work. It supports a 1M-token context window and adjustable thinking levels. Compared with Gemini 3.6 Flash, it improves coding, tool use, multi-step planning, and instruction following.

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 3.7 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
12.8 s
18.2 s
Throughput
71.2 tok/s
79.4 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
August 13, 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-3.7-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-3.7-flash

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

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

Text
gemini-3.1-pro-previewgemini-3.7-flash
1460150015401580
Overall
14871491
Coding
15211522
Math
14891524
Hard prompts
15071508
Instruction following
14811485
Multi-turn
14951498
Creative writing
14791496
Longer query
14991500
Chinese
15311554
English
14891489
WebDev Arena
gemini-3.1-pro-previewgemini-3.7-flash
1380146015401620
Overall
14461587
React
14381581
HTML
14921625
Gaming
14661635
Simulations
14771625
Data analytics
14041569

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 3.7 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 3.7 Flash?

Gemini 3.7 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 3.7 Flash: 1522; Gemini 3.1 Pro Preview: 1521 (LMArena coding leaderboard).

Which responds faster?

Gemini 3.1 Pro Preview: 12.8s 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 3.7 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 3.7 Flash.

Which one generates tokens faster?

Gemini 3.7 Flash at 79.4 tok/s and Gemini 3.1 Pro Preview at 71.2 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 3.7 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 3.7 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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