Model Comparison

o1 vs Gemini DiffusionWhich is better in 2026?

o1 shows notably better performance in the majority of benchmarks.

Verdict: o1 vs Gemini Diffusion — which is better?

o1 (by OpenAI) and Gemini Diffusion (by Google) 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.

o1 outperforms in 2 benchmarks (GPQA, SWE-Bench Verified), while Gemini Diffusion is better at 1 benchmark (HumanEval). o1 shows notably better performance in the majority of benchmarks.

Choose o1 if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks

Choose Gemini Diffusion if…

  • you want the most recent training data — it shipped May 2025
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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

o1 outperforms in 2 benchmarks (GPQA, SWE-Bench Verified), while Gemini Diffusion is better at 1 benchmark (HumanEval).

o1 shows notably better performance in the majority of benchmarks.

Wed Jun 17 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).

OpenAI
o1
Input200,000 tokens
Output100,000 tokens
Google
Gemini Diffusion
Input- tokens
Output- tokens
Wed Jun 17 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

o1

Proprietary

Closed source

Gemini Diffusion

Proprietary

Closed source

Release Timeline

When each model was launched

o1 was released on 2024-12-17, while Gemini Diffusion was released on 2025-05-20.

Gemini Diffusion is 5 months newer than o1.

o1

Dec 17, 2024

1.5 years ago

Gemini Diffusion

May 20, 2025

1.1 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

OpenAI
Larger context window (200,000 tokens)
Higher GPQA score (78.0% vs 40.4%)
Higher SWE-Bench Verified score (41.0% vs 22.9%)
Google
Higher HumanEval score (89.6% vs 88.1%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
o1
Google
Gemini Diffusion

FAQ

Common questions about o1 vs Gemini Diffusion.

Which is better, o1 or Gemini Diffusion?

o1 shows notably better performance in the majority of benchmarks. o1 is made by OpenAI and Gemini Diffusion is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does o1 compare to Gemini Diffusion in benchmarks?

o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%. Gemini Diffusion scores HumanEval: 89.6%, MBPP: 76.0%, Global-MMLU-Lite: 69.1%, LBPP (v2): 56.8%, BigCodeBench: 45.4%.

What are the context window sizes for o1 and Gemini Diffusion?

o1 supports 200K tokens and Gemini Diffusion supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes o1 and Gemini Diffusion?

o1 is developed by OpenAI and Gemini Diffusion is developed by Google.

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