Model Comparison
Gemini 2.0 Flash Thinking vs o3Which is better in 2026?
o3 significantly outperforms across most benchmarks.
Verdict: Gemini 2.0 Flash Thinking vs o3 — which is better?
Gemini 2.0 Flash Thinking (by Google) and o3 (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 2.0 Flash Thinking outperforms in 0 benchmarks, while o3 is better at 3 benchmarks (AIME 2024, GPQA, MMMU). o3 significantly outperforms across most benchmarks.
Choose Gemini 2.0 Flash Thinking if…
- you are already invested in the Google ecosystem
Choose o3 if…
- you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
- you want the most recent training data — it shipped Apr 2025
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 2.0 Flash Thinking outperforms in 0 benchmarks, while o3 is better at 3 benchmarks (AIME 2024, GPQA, MMMU).
o3 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Context Window
Maximum input and output token capacity
Only o3 specifies input context (200,000 tokens). Only o3 specifies output context (100,000 tokens).
Input Capabilities
Supported data types and modalities
Both Gemini 2.0 Flash Thinking and o3 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.0 Flash Thinking
o3
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 2.0 Flash Thinking was released on 2025-01-21, while o3 was released on 2025-04-16.
o3 is 3 months newer than Gemini 2.0 Flash Thinking.
Jan 21, 2025
1.5 years ago
Apr 16, 2025
1.3 years ago
2mo newerKnowledge Cutoff
When training data ends
Gemini 2.0 Flash Thinking has a knowledge cutoff of 2024-08-01, while o3 has a cutoff of 2024-05-31.
Gemini 2.0 Flash Thinking has more recent training data (up to 2024-08-01), making it potentially better informed about events through that date compared to o3 (2024-05-31).
Aug 2024
3 mo newerMay 2024
Outputs Comparison
Key Takeaways
No standout differentiators in the data we have for this pair.
o3
View detailsOpenAI
Gemini 2.0 Flash Thinkingo3Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against Gemini 2.0 Flash Thinking and o3 side-by-side, then vote on the output you prefer.
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FAQ
Common questions about Gemini 2.0 Flash Thinking vs o3.