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Gemini 3.1 Pro Preview vs GPT-5.5 Pro

How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Gemini 3.1 Pro Preview and GPT-5.5 Pro.

Google

Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview is Google’s frontier reasoning model, delivering enhanced software engineering performance, improved agentic reliability, and more efficient token usage across complex workflows. Building on the multimodal foundation...

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OpenAI

GPT-5.5 Pro

GPT-5.5 Pro is OpenAI’s high-capability model optimized for deep reasoning and accuracy on complex, high-stakes workloads. It features a 1M+ token context window (922K input, 128K output) with support for...

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Technical Specifications

SpecificationGemini 3.1 Pro PreviewGPT-5.5 Pro
ProviderGoogleOpenAI
Context Window1,048,576 tokens1,050,000 tokens
Agent SuitabilityN/A98/100
Time to First Token (TTFT)N/A450 ms
Deployment Modelmanaged apimanaged api
Production Stabilitybetabeta
API AvailableYesYes
Released Date2026-02-192026-04-24

API Pricing Comparison

Input Price per Million Tokens

Gemini 3.1 Pro Preview

$2.00

GPT-5.5 Pro

$30.00

Output Price per Million Tokens

Gemini 3.1 Pro Preview

$12.00

GPT-5.5 Pro

$180.00

Want to test both models live?

Run side-by-side prompt prompts in our dynamic Sandbox. Check execution speeds, latency metrics, and compute actual costs in real-time.

Benchmark Performance Metrics

Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.

MMLUGeneral knowledge & multi-task understanding
N/Avs9650.0%
Gemini 3.1 Pro Preview
GPT-5.5 Pro
HumanEvalPython coding & logic synthesis
N/Avs9820.0%
Gemini 3.1 Pro Preview
GPT-5.5 Pro
MATHComplex mathematical problem solving
N/Avs9600.0%
Gemini 3.1 Pro Preview
GPT-5.5 Pro
GPQAGraduate-level expert reasoning
N/Avs8910.0%
Gemini 3.1 Pro Preview
GPT-5.5 Pro
HellaSwagCommonsense reasoning and inference
N/Avs9940.0%
Gemini 3.1 Pro Preview
GPT-5.5 Pro
MT-BenchMulti-turn conversation flow quality
N/Avs990.0%
Gemini 3.1 Pro Preview
GPT-5.5 Pro

Gemini 3.1 Pro Preview Quirks & Gotchas

No developer gotchas reported.

GPT-5.5 Pro Quirks & Gotchas

  • Best-in-class instruction following for complex agentic chains
  • Premium pricing — use GPT-5 for cost-sensitive workloads