AI Models · Paid vs Paid

GPT-5.5 Paid vs Gemini 3.1 Pro Preview Paid

GPT-5.5 vs Gemini 3.1 Pro Preview compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

GPT-5.5 — full profile ›  ·  Gemini 3.1 Pro Preview — full profile ›

Prices & specs refreshed from live data · OpenSourceAI.tech

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

Choose Gemini 3.1 Pro Preview for the lower output price ($12/M vs $30/M). Choose GPT-5.5 if you need the larger 1.1M context window.

GPT-5.5 vs Gemini 3.1 Pro Preview specs

SpecGPT-5.5Gemini 3.1 Pro Preview
MakerOpenAIGoogle
TypeProprietaryProprietary
Context window1.1M tokens1M tokens
Input price$5/M$2/M
Output price$30/M$12/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityGPT-5.5Gemini 3.1 Pro Preview
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: GPT-5.5 vs Gemini 3.1 Pro Preview

Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).

Gemini 3.1 Pro Preview delivers 2.1× more intelligence per dollar.
GPT-5.5
Gemini 3.1 Pro Preview
Intelligence index
54.8
46.5
Coding index
74.9
68.8
GPQA
93.5%
94.1%
Humanity's Last Exam
44.3%
44.7%
Long Context Reasoning
74.3%
72.7%
SciCode
56.1%
58.9%
IFBench
75.9%
77.1%
τ²-Bench
93.9%
95.6%
τ-Bench Banking
31.3%
16.5%
Terminal-Bench
84.3%
73.8%
Terminal-Bench Hard
60.6%
53.8%
Speed
86.2 tok/s
137.1 tok/s
Latency
31.22s
23.58s
Intelligence per $
4.9
10.3

Benchmark data by Artificial Analysis.

How GPT-5.5 and Gemini 3.1 Pro Preview score

🤝 Neck and neck on these criteria (3.1 vs 3.2 / 5).
CriterionGPT-5.5Gemini 3.1 Pro Preview
Cost-efficiency3.03.5
Context window5.05.0
Openness1.51.5
Self-hosting1.01.0
Multimodality5.05.0

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

GPT-5.5 Paid

OpenAI · Proprietary

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

Gemini 3.1 Pro Preview Paid

Google · Proprietary

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.

Other models in these families

These variants are tracked but not compared here — one page per family keeps the comparison readable.

Other variants tracked
GPT-5.4GPT-5.2GPT-5GPT-5.6 Luna Pro
Other variants tracked
Gemini 2.5 Pro

Frequently asked questions

GPT-5.5 vs Gemini 3.1 Pro Preview — which is cheaper?

Gemini 3.1 Pro Preview is cheaper on output ($12/M vs $30/M).

Which has the larger context window?

GPT-5.5 offers the larger context window (1.1M tokens).

GPT-5.5 vs Gemini 3.1 Pro Preview — which should I pick in 2026?

Choose Gemini 3.1 Pro Preview for the lower output price ($12/M vs $30/M). Choose GPT-5.5 if you need the larger 1.1M context window.

People also compare

DeepSeek V4 Flash vs GPT-5.5DeepSeek V4 Flash vs Gemini 3.1 Pro PreviewGLM 5.2 vs GPT-5.5GLM 5.2 vs Gemini 3.1 Pro PreviewMiniMax M3 vs GPT-5.5MiniMax M3 vs Gemini 3.1 Pro Preview

Explore more open-source AI

Browse the full open-source model leaderboard, thousands of tools and live benchmarks — all in one place.

Open the leaderboard →