Model Comparison

Gemini 2.5 Flash-Lite vs o1-pro

o1-pro significantly outperforms across most benchmarks.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Gemini 2.5 Flash-Lite outperforms in 0 benchmarks, while o1-pro is better at 1 benchmark (GPQA).

o1-pro significantly outperforms across most benchmarks.

Sat May 02 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Gemini 2.5 Flash-Lite specifies input context (1,048,576 tokens). Only Gemini 2.5 Flash-Lite specifies output context (65,536 tokens).

Google
Gemini 2.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
OpenAI
o1-pro
Input- tokens
Output- tokens
Sat May 02 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash-Lite and o1-pro support multimodal inputs.

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

Gemini 2.5 Flash-Lite

Text
Images
Audio
Video

o1-pro

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 2.5 Flash-Lite is licensed under Creative Commons Attribution 4.0 License, while o1-pro uses a proprietary license.

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

Gemini 2.5 Flash-Lite

Creative Commons Attribution 4.0 License

Open weights

o1-pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash-Lite was released on 2025-06-17, while o1-pro was released on 2024-12-17.

Gemini 2.5 Flash-Lite is 6 months newer than o1-pro.

Gemini 2.5 Flash-Lite

Jun 17, 2025

10 months ago

6mo newer
o1-pro

Dec 17, 2024

1.4 years ago

Knowledge Cutoff

When training data ends

Gemini 2.5 Flash-Lite has a knowledge cutoff of 2025-01-01, while o1-pro has a cutoff of 2023-09-30.

Gemini 2.5 Flash-Lite has more recent training data (up to 2025-01-01), making it potentially better informed about events through that date compared to o1-pro (2023-09-30).

Gemini 2.5 Flash-Lite

Jan 2025

1.3 yr newer
o1-pro

Sep 2023

Outputs Comparison

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Key Takeaways

Google
Larger context window (1,048,576 tokens)
Has open weights
OpenAI
Higher GPQA score (79.0% vs 64.6%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash-Lite
OpenAI
o1-pro

FAQ

Common questions about Gemini 2.5 Flash-Lite vs o1-pro.

Which is better, Gemini 2.5 Flash-Lite or o1-pro?

o1-pro significantly outperforms across most benchmarks. Gemini 2.5 Flash-Lite 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 2.5 Flash-Lite compare to o1-pro in benchmarks?

Gemini 2.5 Flash-Lite scores FACTS Grounding: 84.1%, Global-MMLU-Lite: 81.1%, MMMU: 72.9%, GPQA: 64.6%, Vibe-Eval: 51.3%. o1-pro scores AIME 2024: 86.0%, GPQA: 79.0%.

What are the context window sizes for Gemini 2.5 Flash-Lite and o1-pro?

Gemini 2.5 Flash-Lite 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.

What are the main differences between Gemini 2.5 Flash-Lite and o1-pro?

Key differences include licensing (Creative Commons Attribution 4.0 License vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Gemini 2.5 Flash-Lite and o1-pro?

Gemini 2.5 Flash-Lite is developed by Google and o1-pro is developed by OpenAI.