AI Models · Paid vs Paid

GPT-5.6 Terra Paid vs Gemini 3.1 Pro Preview Paid

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

GPT-5.6 Terra — 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 $15/M). Choose GPT-5.6 Terra if you need the larger 1.1M context window.

GPT-5.6 Terra vs Gemini 3.1 Pro Preview specs

SpecGPT-5.6 TerraGemini 3.1 Pro Preview
MakerOpenAIGoogle
TypeProprietaryProprietary
Context window1.1M tokens1M tokens
Input price$2.5/M$2/M
Output price$15/M$12/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

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

Benchmarks: GPT-5.6 Terra vs Gemini 3.1 Pro Preview

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

GPT-5.6 Terra
Gemini 3.1 Pro Preview
Intelligence index
55
46.5
Coding index
76.7
68.8
GPQA
92.5%
94.1%
Humanity's Last Exam
41.8%
44.7%
Long Context Reasoning
74%
72.7%
SciCode
53.9%
58.9%
IFBench
71.2%
77.1%
τ²-Bench
86.3%
95.6%
τ-Bench Banking
31.8%
16.5%
Terminal-Bench
88%
73.8%
Terminal-Bench Hard
57.6%
53.8%
Speed
153.9 tok/s
137.1 tok/s
Latency
102.59s
23.58s
Intelligence per $
9.8
10.3

Benchmark data by Artificial Analysis.

How GPT-5.6 Terra and Gemini 3.1 Pro Preview score

🤝 Neck and neck on these criteria (3.1 vs 3.2 / 5).
CriterionGPT-5.6 TerraGemini 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-5.6 Terra Paid

OpenAI · Proprietary

GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier. It is suited for everyday coding, reasoning, and agentic...

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
Gemini 2.5 Pro

Frequently asked questions

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

Gemini 3.1 Pro Preview is cheaper on output ($12/M vs $15/M).

Which has the larger context window?

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

GPT-5.6 Terra 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 $15/M). Choose GPT-5.6 Terra if you need the larger 1.1M context window.

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