The Known Good Updated 25 Jul 2026
Google: Gemma 3 27B vs OpenAI: o3 ·Google vs OpenAI

Google: Gemma 3 27B vs OpenAI: o3 — head-to-head comparison

Google: Gemma 3 27B profile OpenAI: o3 profile All comparisons
Google: Gemma 3 27B — Google
Quality
#47 of 61
37based on 3 of 6 evaluations
Known Good Index
Speed
#262 of 316
24.5
Output tokens per second
Price
#64 of 340
$0.17
Blended per 1M tokens
In $0.08 · Out $0.45
Cache hit price
#62 of 206
$0.040
per 1M tokens (−50%)
Context
#171 of 345
262k
tokens (~400 pages)
OpenAI: o3 — OpenAI
Quality
#28 of 61
67based on 4 of 6 evaluations
Known Good Index
Speed
#69 of 316
89.1
Output tokens per second
Price
#269 of 340
$3.50
Blended per 1M tokens
In $2.00 · Out $8.00
Cache hit price
#175 of 206
$0.50
per 1M tokens (−75%)
Context
#203 of 345
200k
tokens (~300 pages)
Summary

On the Known Good Index, Google: Gemma 3 27B scores 37 and OpenAI: o3 scores 67 — a 30-point lead for OpenAI: o3. They share 3 published evaluations, with Google: Gemma 3 27B ahead on 0 and OpenAI: o3 ahead on 3.

Blended pricing is $0.17 per 1M tokens for Google: Gemma 3 27B and $3.50 for OpenAI: o3 — Google: Gemma 3 27B is about 20.3× cheaper.

Throughput is 24 tokens per second for Google: Gemma 3 27B and 89 for OpenAI: o3, with time to first token at 0.9s and 2.7s. Google: Gemma 3 27B accepts 262k tokens of context against 200k.

Google: Gemma 3 27B is open weights under Open weights (restricted use); OpenAI: o3 is proprietary. 6 tracked hosts serve one or both.

Generated from tracked data on 26 Jul 2026 · how these comparisons are computed →

At a glance
MetricGoogle: Gemma 3 27BOpenAI: o3
Known Good Index 37 based on 3 of 6 evaluations 67 based on 4 of 6 evaluations
Blended $/1M $0.17 $3.50
Output tok/s 24 89
Context window 262k 200k
Providers 5 1
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Quality

Known Good Index and the capability indices, side by side

IndicesComponents
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 27BOpenAI: o3
Known Good Index 37 67
Mathematics Index 47 92
Science Index 44 84
Reasoning Index 40 62
Agentic Index — 60
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 = OpenAI: o3 · scores ingested from Epoch AI (CC-BY 4.0)

GPQA Diamond49 / 82
MATH / AIME20 / 84
MATH Level 574 / 98

Right-hand figures read Google: Gemma 3 27B / OpenAI: o3. Google: Gemma 3 27B leads on 0 of 3, OpenAI: o3 on 3.

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.

Neither model currently appears in an arena we ingest.

The Known Good

Price & Cost

Published API pricing by token type

Per token typeCache discount
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 27BOpenAI: o3
Input $/1M $0.08 $2.00
Output $/1M $0.45 $8.00
Blended $/1M $0.17 $3.50
Cache read $/1M $0.040 $0.500
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 27BOpenAI: o3
Context window 262k 200k
Max output tokens 131k 100k
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: Gemma 3 27BOpenAI: o3
Output tokens/s 24 89
Time to first token 0.9s 2.7s
The Known Good

Providers

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

6 hosts
Full provider benchmarks →
Provider Google: Gemma 3 27B blendedGoogle: Gemma 3 27B tok/s OpenAI: o3 blendedOpenAI: o3 tok/s
Parasail $0.17 44 — —
Novita $0.14 33 — —
DeepInfra $0.10 22 — —
Nebius $0.15 19 — —
Phala $0.23 12 — —
OpenAI · first party — — $3.50 102

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) Full attribution →