The Known Good Updated 29 Jul 2026
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 62
96based on 4 of 7 evaluations
Known Good Index
Speed
#33 of 317
104.5
Output tokens per second
Price
#311 of 370
$4.50
Blended per 1M tokens
In $2.00 · Out $12.00
Cache hit price
#166 of 238
$0.20
per 1M tokens (−90%)
Context
#24 of 375
1.05M
tokens (~1,600 pages)
Google: Gemma 3 27B — Google
Quality
#46 of 62
46based on 4 of 7 evaluations
Known Good Index
Speed
#278 of 317
20.9
Output tokens per second
Price
#66 of 370
$0.17
Blended per 1M tokens
In $0.08 · Out $0.45
Cache hit price
#74 of 238
$0.040
per 1M tokens (−50%)
Context
#198 of 375
262k
tokens (~400 pages)
Summary

On the Known Good Index, Google: Gemini 3.1 Pro Preview scores 96 and Google: Gemma 3 27B scores 46 — 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 104 tokens per second for Google: Gemini 3.1 Pro Preview and 21 for Google: Gemma 3 27B, with time to first token at 3.1s and 1.1s. Google: Gemini 3.1 Pro Preview accepts 1.05M tokens of context against 262k.

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 29 Jul 2026 · how these comparisons are computed →

At a glance
MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Known Good Index 96 based on 4 of 7 evaluations 46 based on 4 of 7 evaluations
Blended $/1M $4.50 $0.17
Output tok/s 104 21
Context window 1.05M 262k
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 96 46
Mathematics Index 96 47
Reasoning Index 100 40
Agentic Index 88
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 / 49
Mock AIME 2024–2596 / 20

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 1,479
Text Arena (style controlled) 1,486
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 262k
Max output tokens 66k 131k
The Known Good

Speed & Latency

Median throughput and time to first token across hosting providers

Output speedTime to first token
Throughput and latency

Medians across all tracked providers, derived from OpenRouter endpoint telemetry.

MetricGoogle: Gemini 3.1 Pro PreviewGoogle: Gemma 3 27B
Output tokens/s 104 21
Time to first token 3.1s 1.1s
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 AI Studio $2.25 109
Google · first party $2.25 98
Parasail $0.17 37
Phala $0.23 20
DeepInfra $0.10 18
Novita $0.14 17
Nebius $0.15 15

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 →