AI Models · Paid vs Paid

Gemini 3.1 Pro Preview Paid vs GPT-5.6 Luna Paid

Gemini 3.1 Pro Preview vs GPT-5.6 Luna compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Gemini 3.1 Pro Preview — full profile ›  ·  GPT-5.6 Luna — full profile ›

Prices & specs refreshed from live data · OpenSourceAI.tech

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

Choose GPT-5.6 Luna for the lower output price ($6/M vs $12/M). It also gives you the larger 1.1M context window.

Gemini 3.1 Pro Preview vs GPT-5.6 Luna specs

SpecGemini 3.1 Pro PreviewGPT-5.6 Luna
MakerGoogleOpenAI
TypeProprietaryProprietary
Context window1M tokens1.1M tokens
Input price$2/M$1/M
Output price$12/M$6/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityGemini 3.1 Pro PreviewGPT-5.6 Luna
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: Gemini 3.1 Pro Preview vs GPT-5.6 Luna

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

GPT-5.6 Luna delivers 2.2× more intelligence per dollar.
Gemini 3.1 Pro Preview
GPT-5.6 Luna
Intelligence index
46.5
51.2
Coding index
68.8
71.4
GPQA
94.1%
91.1%
Humanity's Last Exam
44.7%
37.2%
Long Context Reasoning
72.7%
74%
SciCode
58.9%
52.5%
IFBench
77.1%
–
τ²-Bench
95.6%
–
τ-Bench Banking
16.5%
27.2%
Terminal-Bench
73.8%
80.9%
Terminal-Bench Hard
53.8%
–
Speed
137.1 tok/s
212.1 tok/s
Latency
23.58s
63.49s
Intelligence per $
10.3
22.8

Benchmark data by Artificial Analysis.

How Gemini 3.1 Pro Preview and GPT-5.6 Luna score

🤝 Neck and neck on these criteria (3.2 vs 3.3 / 5).
CriterionGemini 3.1 Pro PreviewGPT-5.6 Luna
Cost-efficiency3.54.0
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

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.

GPT-5.6 Luna Paid

OpenAI · Proprietary

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...

Other models in these families

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

Other variants tracked
Gemini 2.5 Pro

Frequently asked questions

Gemini 3.1 Pro Preview vs GPT-5.6 Luna — which is cheaper?

GPT-5.6 Luna is cheaper on output ($6/M vs $12/M).

Which has the larger context window?

GPT-5.6 Luna offers the larger context window (1.1M tokens).

Gemini 3.1 Pro Preview vs GPT-5.6 Luna — which should I pick in 2026?

Choose GPT-5.6 Luna for the lower output price ($6/M vs $12/M). It also gives you the larger 1.1M context window.

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