Gemini 3.1 Pro Preview
Google · text, image, video, audio, pdf → text
Input$2 /M
Output$12 /M
Cache read$0.5 /M
← ModelsGemini 3.1 Pro Preview
GPT 5.5
Gemini 3.1 Pro Preview vs GPT 5.5
Compare Gemini 3.1 Pro Preview from Google and GPT 5.5 from OpenAI on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.
Gemini 3.1 Pro PreviewGPT 5.5+ Add model · 2/4
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
Gemini 3.1 Pro Preview
GPT 5.5
Input /M
$2
$2
Output /M
$12
$0
Cache read /M
$0.5
-
Context length
1,048,576
1,050,000
Max output
65,536
128,000
Time to First Token
-
5.9 s
Throughput
-
52.3 tok/s
Modalities
textimagevideoaudiopdf
textimagepdf
Supported Parameters
API Formats
Released
-
-
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-previewgpt-5.5
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-previewgpt-5.5
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-previewgpt-5.5
1440148015201560
Overall
14631480
Coding
14791486
Math
14771489
Instruction following
14671470
Longer query
14731484
Chinese
15271544
English
14631477
Vision
gemini-3.1-pro-previewgpt-5.5
12801300132013401360
Overall
12951298
OCR
13031308
Diagram
13151325
Homework
13181327
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.
GPT 5.5
$120 /mo
Gemini 3.1 Pro Preview
$300 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
How do their coding arena scores compare?
Gemini 3.1 Pro Preview: 1486; GPT 5.5: 1479 (LMArena coding leaderboard).
How large is each context window?
Gemini 3.1 Pro Preview accepts 1,048,576 and GPT 5.5 accepts 1,050,000 input tokens. Maximum output per request is 65,536 tokens on Gemini 3.1 Pro Preview and 128,000 tokens on GPT 5.5.
What inputs and capabilities does each model support?
Gemini 3.1 Pro Preview accepts text, image, video, audio and PDF input; GPT 5.5 accepts text, image and PDF input.
Can I call Gemini 3.1 Pro Preview and GPT 5.5 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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