The Known Good Updated 4 Sep 2026 Subscribe
Google: Gemini 3.1 Pro Preview vs Google: Gemma 3 27B ·Google vs Google

Google: Gemini 3.1 Pro Preview vs Google: Gemma 3 27B — head-to-head comparison

Google: Gemini 3.1 Pro Preview profile Google: Gemma 3 27B profile All comparisons
Google: Gemini 3.1 Pro Preview — Google
Quality
#2 of 65
97based on 4 of 7 evaluations
Known Good Index
Speed
#45 of 338
101.0
Output tokens per second
Price
#373 of 442
$4.50
Blended per 1M tokens
In $2.00 · Out $12.00
Cache hit price
#225 of 324
$0.20
per 1M tokens (−90%)
Context
#45 of 476
1.05M
tokens (~1,600 pages)
Google: Gemma 3 27B — Google
Quality
#49 of 65
47based on 4 of 7 evaluations
Known Good Index
Speed
#311 of 338
19.0
Output tokens per second
Price
#73 of 442
$0.17
Blended per 1M tokens
In $0.08 · Out $0.45
Cache hit price
#104 of 324
$0.040
per 1M tokens (−50%)
Context
#373 of 476
131k
tokens (~200 pages)
Summary

On the Known Good Index, Google: Gemini 3.1 Pro Preview scores 97 and Google: Gemma 3 27B scores 47 — a 50-point lead for Google: Gemini 3.1 Pro Preview. They share 2 published evaluations, with Google: Gemini 3.1 Pro Preview ahead on 2 and Google: Gemma 3 27B ahead on 0.

Blended pricing is $4.50 per 1M tokens for Google: Gemini 3.1 Pro Preview and $0.17 for Google: Gemma 3 27B — Google: Gemma 3 27B is about 26.1× cheaper.

Throughput is 101 tokens per second for Google: Gemini 3.1 Pro Preview and 19 for Google: Gemma 3 27B, with time to first token at 3.3s and 1.0s. Google: Gemini 3.1 Pro Preview accepts 1.05M tokens of context against 131k.

Google: Gemini 3.1 Pro Preview is proprietary; Google: Gemma 3 27B is open weights under Open weights (restricted use). 7 tracked hosts serve one or both.

Generated from tracked data on 4 Sep 2026 · how these comparisons are computed →

At a glance
MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Known Good Index 97 based on 4 of 7 evaluations 47 based on 4 of 7 evaluations
Blended $/1M $4.50 $0.17
Output tok/s 101 19
Context window 1.05M 131k
Providers 2 5
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Quality

Known Good Index and the capability indices, side by side

Index scores

Each index is min-max normalised across tracked models and scaled 0–100 from published evaluations. We do not run these evaluations.

MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Known Good Index 97 47
Mathematics Index 49
Reasoning Index 99 40
Openness Index 5 60
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = Google: Gemini 3.1 Pro Preview · marker = Google: Gemma 3 27B · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond94 / 48
Mock AIME 2024–2596 / 22

Right-hand figures read Google: Gemini 3.1 Pro Preview / Google: Gemma 3 27B. Google: Gemini 3.1 Pro Preview leads on 2 of 2, Google: Gemma 3 27B on 0.

The Known Good

Arena Elo

Human preference rating from blind pairwise votes

Arena ratings

Elo from blind pairwise votes, ingested from Arena. Higher is better.

MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Text Arena 1,480 1,358
Text Arena (style controlled) 1,487 1,365
The Known Good

Price & Cost

Published API pricing by token type

Published pricing

USD per 1M tokens. Blended is a 3:1 input:output mix. Live from OpenRouter, cross-checked against models.dev. Lower is better.

MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Input $/1M $2.00 $0.08
Output $/1M $12.00 $0.45
Blended $/1M $4.50 $0.17
Cache read $/1M $0.200 $0.040
The Known Good
We publish blended price rather than cost-per-task. Cost-per-task requires token counts from an evaluation suite we do not run. Blended price is computed from published rates and is fully reproducible — see the pricing methodology.

Context Window

Maximum input accepted and maximum output emitted

Context and output limits

Provider-declared limits, from metadata via models.dev and OpenRouter. Higher is better.

MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Context window 1.05M 131k
Max output tokens 66k 118k
The Known Good

Speed & Latency

Mean throughput and time to first token across hosting providers, over successful measurements from the last 48 hours

Throughput and latency

Means across all tracked providers over successful measurements from the last 48 hours, derived from OpenRouter endpoint telemetry.

MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Output tokens/s 101 19
Time to first token 3.3s 1.0s
The Known Good

Providers

Which hosts serve each model, and at what price and speed

7 hosts
Full provider benchmarks →
Provider Google: Gemini 3.1 Pro Preview blendedGoogle: Gemini 3.1 Pro Preview tok/s Google: Gemma 3 27B blendedGoogle: Gemma 3 27B tok/s
Google · first party $2.25 128
Google AI Studio $2.25 111
Phala $0.23 51
DeepInfra $0.10 16
Parasail $0.17 11
Nebius $0.15 7
Novita $0.14 7

Per-host pricing and telemetry from OpenRouter. A dash means that host does not serve that model.

The Known Good
Sources for this page
Pricing & providers — OpenRouter Metadata — models.dev Benchmarks — Epoch AI (CC-BY 4.0)Elo — Arena Full attribution →