The Known Good Updated 9 Sep 2026 Subscribe
Google: Gemma 3 27B vs gpt-4.5-preview ·Google vs OpenAI

Google: Gemma 3 27B vs gpt-4.5-preview — head-to-head comparison

Google: Gemma 3 27B profile gpt-4.5-preview profile All comparisons
Google: Gemma 3 27B — Google
Quality
#49 of 65
47based on 4 of 7 evaluations
Known Good Index
Speed
#300 of 339
20.6
Output tokens per second
Price
#75 of 450
$0.17
Blended per 1M tokens
In $0.08 · Out $0.45
Cache hit price
#112 of 344
$0.040
per 1M tokens (−50%)
Context
#384 of 487
131k
tokens (~200 pages)
gpt-4.5-preview — OpenAI
Quality
#46 of 65
54based on 5 of 7 evaluations
Known Good Index
Speed
unranked
Output tokens per second
Price
unranked
Blended per 1M tokens
Cache hit price
unranked
per 1M tokens
Context
unranked
tokens
Summary

On the Known Good Index, Google: Gemma 3 27B scores 47 and gpt-4.5-preview scores 54 — a 7-point lead for gpt-4.5-preview. They share 10 published evaluations, with Google: Gemma 3 27B ahead on 1 and gpt-4.5-preview ahead on 9.

Published pricing is tracked for Google: Gemma 3 27B only, at $0.17 per 1M tokens blended.

Google: Gemma 3 27B is open weights under Open weights (restricted use); gpt-4.5-preview is proprietary. 5 tracked hosts serve one or both.

Generated from tracked data on 9 Sep 2026 · how these comparisons are computed →

At a glance
MetricGoogle: Gemma 3 27Bgpt-4.5-preview
Known Good Index 47 based on 4 of 7 evaluations 54 based on 5 of 7 evaluations
Blended $/1M $0.17
Output tok/s 21
Context window 131k
Providers 5 0
Jump to section

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: Gemma 3 27Bgpt-4.5-preview
Known Good Index 47 54
Mathematics Index 49 59
Reasoning Index 40 48
Openness Index 60 5
The Known Good

Quality Breakdown

Every evaluation both models report a published score for

Evaluations both models report

Bar = Google: Gemma 3 27B · marker = gpt-4.5-preview · scores ingested from Epoch AI (CC-BY 4.0), LiveBench (Apache-2.0)

GPQA Diamond48 / 69
Mock AIME 2024–2522 / 38
MATH Level 574 / 79
LiveBench50 / 69
LiveBench Coding40 / 75
LiveBench Data Analysis51 / 64
LiveBench Instruction Following75 / 72
LiveBench Language35 / 61
LiveBench Mathematics55 / 69
LiveBench Reasoning44 / 71

Right-hand figures read Google: Gemma 3 27B / gpt-4.5-preview. Google: Gemma 3 27B leads on 1 of 10, gpt-4.5-preview on 9.

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: Gemma 3 27Bgpt-4.5-preview
Text Arena 1,358
Text Arena (style controlled) 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: Gemma 3 27Bgpt-4.5-preview
Input $/1M $0.08
Output $/1M $0.45
Blended $/1M $0.17
Cache read $/1M $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: Gemma 3 27Bgpt-4.5-preview
Context window 131k
Max output tokens 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: Gemma 3 27Bgpt-4.5-preview
Output tokens/s 21
Time to first token 1.6s
The Known Good

Providers

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

5 hosts
Full provider benchmarks →
Provider Google: Gemma 3 27B blendedGoogle: Gemma 3 27B tok/s gpt-4.5-preview blendedgpt-4.5-preview tok/s
Phala $0.23 51
Novita $0.14 28
Parasail $0.17 25
Nebius $0.15 15
DeepInfra $0.10 13

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)Benchmarks — LiveBench (Apache-2.0)Elo — Arena Full attribution →