Model Comparison

Gemini 3 Flash vs o1-proWhich is better in 2026?

Gemini 3 Flash significantly outperforms across most benchmarks.

Verdict: Gemini 3 Flash vs o1-pro — which is better?

Gemini 3 Flash (by Google) and o1-pro (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.

Gemini 3 Flash outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks. Gemini 3 Flash significantly outperforms across most benchmarks.

Choose Gemini 3 Flash if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Dec 2025

Choose o1-pro if…

  • you are already invested in the OpenAI ecosystem
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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Gemini 3 Flash outperforms in 1 benchmarks (GPQA), while o1-pro is better at 0 benchmarks.

Gemini 3 Flash significantly outperforms across most benchmarks.

Sat Jun 06 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Gemini 3 Flash specifies input context (1,000,000 tokens). Only Gemini 3 Flash specifies output context (65,536 tokens).

Google
Gemini 3 Flash
Input1,000,000 tokens
Output65,536 tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Sat Jun 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 3 Flash and o1-pro support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 3 Flash

Text
Images
Audio
Video

o1-pro

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Gemini 3 Flash

Proprietary

Closed source

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 3 Flash was released on 2025-12-17, while o1-pro was released on 2024-12-17.

Gemini 3 Flash is 12 months newer than o1-pro.

Gemini 3 Flash

Dec 17, 2025

5 months ago

1.0yr newer
o1-pro

Dec 17, 2024

1.5 years ago

Knowledge Cutoff

When training data ends

Gemini 3 Flash has a knowledge cutoff of 2025-01-31, while o1-pro has a cutoff of 2023-09-30.

Gemini 3 Flash has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).

Gemini 3 Flash

Jan 2025

1.3 yr newer
o1-pro

Sep 2023

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,000,000 tokens)
Higher GPQA score (90.4% vs 79.0%)
OpenAI

No standout differentiators in the data we have for this pair.

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 3 Flash
OpenAI
o1-pro

FAQ

Common questions about Gemini 3 Flash vs o1-pro.

Which is better, Gemini 3 Flash or o1-pro?

Gemini 3 Flash significantly outperforms across most benchmarks. Gemini 3 Flash is made by Google and o1-pro is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 3 Flash compare to o1-pro in benchmarks?

Gemini 3 Flash scores Vending-Bench 2: 100.0%, AIME 2025: 99.7%, Global PIQA: 92.8%, MMMLU: 91.8%, GPQA: 90.4%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for Gemini 3 Flash and o1-pro?

Gemini 3 Flash supports 1.0M tokens and o1-pro supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Gemini 3 Flash and o1-pro?

Gemini 3 Flash is developed by Google and o1-pro is developed by OpenAI.

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