AI Models · Paid vs Paid

Gemini 3.1 Pro Preview Paid vs Gemini 2.5 Pro Paid

Gemini 3.1 Pro Preview vs Gemini 2.5 Pro compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Gemini 3.1 Pro Preview — full profile › · Gemini 2.5 Pro — 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 2.5 Pro for the lower output price ($10/M vs $12/M). Choose Gemini 3.1 Pro Preview if you need the larger 1M context window.

Gemini 3.1 Pro Preview vs Gemini 2.5 Pro specs

Spec	Gemini 3.1 Pro Preview	Gemini 2.5 Pro
Maker	Google	Google
Type	Proprietary	Proprietary
Context window	1M tokens	1M tokens
Input price	$2/M	$1.25/M
Output price	$12/M	$10/M
Vision / multimodal	Yes	Yes
Tool / function calling	Yes	Yes
Self-hostable	No (API only)	No (API only)
License	Proprietary	Proprietary

Feature comparison

Capability	Gemini 3.1 Pro Preview	Gemini 2.5 Pro
Open weights (downloadable)	✗	✗
Self-hostable	✗	✗
Runs fully offline	✗	✗
Vision / multimodal	✓	✓
Tool / function calling	✓	✓
1M+ context window	✓	✓

Benchmarks: Gemini 3.1 Pro Preview vs Gemini 2.5 Pro

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

Gemini 3.1 Pro Preview

Gemini 2.5 Pro

Intelligence index

46.5

25.8

Coding index

68.8

33.3

GPQA

94.1%

84.4%

Humanity's Last Exam

44.7%

21.1%

Long Context Reasoning

72.7%

66%

SciCode

58.9%

42.8%

IFBench

77.1%

48.7%

τ²-Bench

95.6%

54.1%

τ-Bench Banking

16.5%

9.3%

Terminal-Bench

73.8%

28.5%

Terminal-Bench Hard

53.8%

26.5%

Math index

–

87.7

MMLU-Pro

–

86.2%

LiveCodeBench

–

80.1%

MATH-500

–

96.7%

AIME

–

88.7%

AIME 2025

–

87.7%

Speed

137.1 tok/s

151.2 tok/s

Latency

23.58s

19.48s

Intelligence per $

10.3

7.5

Benchmark data by Artificial Analysis.

How Gemini 3.1 Pro Preview and Gemini 2.5 Pro score

🤝 Neck and neck on these criteria (3.2 vs 3.2 / 5).

Criterion	Gemini 3.1 Pro Preview	Gemini 2.5 Pro
Cost-efficiency	3.5	3.5
Context window	5.0	5.0
Openness	1.5	1.5
Self-hosting	1.0	1.0
Multimodality	5.0	5.0

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.

Gemini 2.5 Pro Paid

Google · Proprietary

Gemini 2.5 Pro is Google’s state-of-the-art AI model designed for advanced reasoning, coding, mathematics, and scientific tasks. It employs “thinking” capabilities, enabling it to reason through responses with enhanced accuracy...

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

Other variants tracked

Gemini 3.1 Pro Preview

Frequently asked questions

Gemini 3.1 Pro Preview vs Gemini 2.5 Pro — which is cheaper?

Gemini 2.5 Pro is cheaper on output ($10/M vs $12/M).

Which has the larger context window?

Gemini 3.1 Pro Preview offers the larger context window (1M tokens).

Gemini 3.1 Pro Preview vs Gemini 2.5 Pro — which should I pick in 2026?

Choose Gemini 2.5 Pro for the lower output price ($10/M vs $12/M). Choose Gemini 3.1 Pro Preview if you need the larger 1M context window.

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