Model Comparison

Gemma 2 27B vs o1Which is better in 2026?

o1 significantly outperforms across most benchmarks.

Verdict: Gemma 2 27B vs o1 — which is better?

Gemma 2 27B (by Google) and o1 (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Gemma 2 27B outperforms in 0 benchmarks, while o1 is better at 4 benchmarks (GSM8k, HumanEval, MATH, MMLU). o1 significantly outperforms across most benchmarks.

Choose Gemma 2 27B if…

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

Choose o1 if…

  • you want the strongest raw capability — it leads on 4 of 4 shared benchmarks
  • you want the most recent training data — it shipped Dec 2024

Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemma 2 27B outperforms in 0 benchmarks, while o1 is better at 4 benchmarks (GSM8k, HumanEval, MATH, MMLU).

o1 significantly outperforms across most benchmarks.

Sun Jul 05 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only o1 specifies input context (200,000 tokens). Only o1 specifies output context (100,000 tokens).

Google
Gemma 2 27B
Input- tokens
Output- tokens
OpenAI
o1
Input200,000 tokens
Output100,000 tokens
Sun Jul 05 2026 • llm-stats.com

License

Usage and distribution terms

Gemma 2 27B is licensed under Gemma, while o1 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

Proprietary

Closed source

Release Timeline

When each model was launched

Gemma 2 27B was released on 2024-06-27, while o1 was released on 2024-12-17.

o1 is 6 months newer than Gemma 2 27B.

Gemma 2 27B

Jun 27, 2024

2.0 years ago

o1

Dec 17, 2024

1.5 years ago

5mo 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→

Key Takeaways

Google
Has open weights
OpenAI
Larger context window (200,000 tokens)
Higher GSM8k score (97.1% vs 74.0%)
Higher HumanEval score (88.1% vs 51.8%)
Higher MATH score (96.4% vs 42.3%)
Higher MMLU score (91.8% vs 75.2%)

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Gemma 2 27B
✓ Preferred
o1
Open in Playground
AI Model Comparison Table
Feature
Google
Gemma 2 27B
OpenAI
o1

FAQ

Common questions about Gemma 2 27B vs o1.

Which is better, Gemma 2 27B or o1?

o1 significantly outperforms across most benchmarks. Gemma 2 27B is made by Google and o1 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

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

Gemma 2 27B scores ARC-E: 88.6%, HellaSwag: 86.4%, BoolQ: 84.8%, TriviaQA: 83.7%, Winogrande: 83.7%. o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%.

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

Gemma 2 27B supports an unknown number of tokens and o1 supports 200K 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?

Key differences include licensing (Gemma vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemma 2 27B and o1?

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

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