Intelligence
n/a
GPT-5.5 Pro
wins
46.5
Gemini 3.1 Pro Preview
GPT-5.5 Pro vs Gemini 3.1 Pro Preview
GPT-5.5 Pro from OpenAI and Gemini 3.1 Pro Preview from Google are shown side by side so you can compare pricing, model IDs, context and output limits, modalities, tool use, release details, and benchmark results where data is available.
GPT-5.5 ProOpenAI
Gemini 3.1 Pro PreviewGoogle
Basic Information
Name
GPT-5.5 ProGPT-5.5 Pro
Model id
GPT-5.5 Progpt-5.5-pro
Intro
GPT-5.5 ProGPT-5.5 Pro is the higher-compute variant of OpenAI’s GPT-5.5 generation, intended for the hardest professional tasks where answer quality matters more than speed. OpenAI materials describe the Pro tier as thinking harder for greater precision across coding, research, data analysis, and document-heavy work. It should be positioned for difficult reasoning and professional-grade deliverables rather than routine chat.
Author
GPT-5.5 ProOpenAI
Released date
GPT-5.5 Pro2026-04-23
Name
Gemini 3.1 Pro PreviewGemini 3.1 Pro Preview
Model id
Gemini 3.1 Pro Previewgemini-3.1-pro-preview
Intro
Gemini 3.1 Pro PreviewGemini 3.1 Pro Preview is presented as a reliability-focused refinement of Gemini 3 Pro. Google’s preview notes emphasize better thinking, token efficiency, grounding, factuality, software engineering, agentic tool use, and multi-step execution. The preview label matters: it should be described as an advanced but evolving model for teams testing the next Pro behavior.
Author
Gemini 3.1 Pro PreviewGoogle
Released date
Gemini 3.1 Pro Preview2026-02-19
Pricing
Input
GPT-5.5 Pro$30/M
Output
GPT-5.5 Pro$180/M
Cached input
GPT-5.5 Pron/a
Input
Gemini 3.1 Pro Preview$2/M
Output
Gemini 3.1 Pro Preview$12/M
Cached input
Gemini 3.1 Pro Preview$0.2/M
Context & Output
Context length
GPT-5.5 Pro1.1M
Max output tokens
GPT-5.5 Pro128K
Context length
Gemini 3.1 Pro Preview1M
Max output tokens
Gemini 3.1 Pro Preview65.5K
Capabilities
Reasoning
GPT-5.5 Pro
Knowledge
GPT-5.5 Pro2025-12-01
Attachment
GPT-5.5 Pro
Input modalities
GPT-5.5 ProImage, PDF, Text
Output modalities
GPT-5.5 ProText
Temperature
GPT-5.5 Pro
Tool use
GPT-5.5 Pro
Reasoning
Gemini 3.1 Pro Preview
Knowledge
Gemini 3.1 Pro Preview2025-01-01
Attachment
Gemini 3.1 Pro Preview
Input modalities
Gemini 3.1 Pro PreviewAudio, Image, PDF, Text, Video
Output modalities
Gemini 3.1 Pro PreviewText
Temperature
Gemini 3.1 Pro Preview
Tool use
Gemini 3.1 Pro Preview
Benchmark
Coding
n/a
GPT-5.5 Pro
wins
55.5
Gemini 3.1 Pro Preview
GPT-5.5 ProOpenAI
Gemini 3.1 Pro PreviewGoogle
Knowledge & Reasoning
GPQA
n/a
HLE
n/a
GPQA
wins94.1%
HLE
wins44.7%
Coding
SciCode
n/a
Terminal-Bench Hard
n/a
SciCode
wins58.9%
Terminal-Bench Hard
wins53.8%
Instruction Following & Agent Tasks
IFBench
n/a
AA-LCR
n/a
Tau2
n/a
IFBench
wins77.1%
AA-LCR
wins72.7%
Tau2
wins95.6%
FAQ
Which model is better, GPT-5.5 Pro or Gemini 3.1 Pro Preview?+
GPT-5.5 Pro and Gemini 3.1 Pro Preview should be compared by workload. This page places price, context, output limits, capabilities, and benchmark data side by side. It is also relevant to: gemini vs chatgpt, chatgpt vs gemini.
Is Gemini 3.1 Pro Preview cheaper than GPT-5.5 Pro?+
Use the pricing rows above to compare input, output, and cached input prices for GPT-5.5 Pro and Gemini 3.1 Pro Preview.
Which model supports a longer context length?+
GPT-5.5 Pro lists 1.1M context length, while Gemini 3.1 Pro Preview lists 1M.
Can I access both models through TokenHub?+
If both models are available in the TokenHub catalog, you can route requests to GPT-5.5 Pro and Gemini 3.1 Pro Preview through the TokenHub API.