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Gemma 2 27B vs o1-preview

o1-preview leads the LLM Stats Score 16.8 to -0.5.

Google · OpenAI · Updated for 2026

Which is better?

o1-preview leads the overall LLM Stats Score 16.8 to -0.5, ranking #207 overall.

In the 2 individual benchmarks reported for both models, o1-preview wins 2; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemma 2 27B

  • you need open weights you can self-host or fine-tune

Choose o1-preview

  • overall performance matters — it scores 16.8 and ranks #207 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 2 of 2 exact shared results
  • you want the most recent training data — it shipped Sep 2024

At a glance

The differences that matter most.

Gemma 2 27B
Google
o1-preview
OpenAI
Core performance indexes
LLM Stats Score
-0.5
#317
16.8
#207
Reasoning
-0.9
#313
17.1
#200
Coding
-7.9
#253
-2.9
#242
Cost, coverage & limits
Benchmark wins
0 of 2
2 of 2
Input price
— / M
$15.00 / M
Output price
— / M
$60.00 / M
Context window
—
128,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Gemma 2 27B
o1-preview
Math
-0.3#288
20.4#150
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

16 reported for Gemma 2 27B · 8 for o1-preview

2 shared

Gemma 2 27B outperforms in 0 benchmarks, while o1-preview is better at 2 benchmarks (MATH, MMLU).

o1-preview significantly outperforms across most benchmarks.

Thu Sep 03 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only o1-preview specifies input context (128,000 tokens). Only o1-preview specifies output context (32,768 tokens).

Google
Gemma 2 27B
Input- tokens
Output- tokens
OpenAI
o1-preview
Input128,000 tokens
Output32,768 tokens
Thu Sep 03 2026 • llm-stats.com

License

Usage and distribution terms

Gemma 2 27B is licensed under Gemma, while o1-preview uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Gemma 2 27B

Gemma

Open weights

o1-preview

Proprietary

Closed source

Release Timeline

When each model was launched

Gemma 2 27B was released on 2024-06-27, while o1-preview was released on 2024-09-12.

o1-preview is 3 months newer than Gemma 2 27B.

Gemma 2 27B

Jun 27, 2024

2.2 years ago

o1-preview

Sep 12, 2024

2.0 years ago

2mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemma 2 27B and o1-preview side-by-side, then vote on the output you prefer.

Gemma 2 27B
✓ Preferred
o1-preview
Open in Playground

FAQ

Common questions about Gemma 2 27B vs o1-preview.

Which is better, Gemma 2 27B or o1-preview?

o1-preview leads the LLM Stats Score 16.8 to -0.5. Gemma 2 27B is made by Google and o1-preview is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemma 2 27B compare to o1-preview in benchmarks?

Gemma 2 27B scores ARC-E: 88.6%, HellaSwag: 86.4%, BoolQ: 84.8%, TriviaQA: 83.7%, Winogrande: 83.7%. o1-preview scores MGSM: 90.8%, MMLU: 90.8%, MATH: 85.5%, GPQA: 73.3%, LiveBench: 52.3%.

What are the context window sizes for Gemma 2 27B and o1-preview?

Gemma 2 27B supports an unknown number of tokens and o1-preview supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemma 2 27B and o1-preview?

Key differences include LLM Stats Score (-0.5 vs 16.8), licensing (Gemma vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemma 2 27B and o1-preview?

Gemma 2 27B is developed by Google and o1-preview is developed by OpenAI.

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