Model Comparison
Gemini 3 Flash vs o1-previewWhich is better in 2026?
Gemini 3 Flash significantly outperforms across most benchmarks. Gemini 3 Flash is 23.3x cheaper per token.
Verdict: Gemini 3 Flash vs o1-preview — which is better?
Gemini 3 Flash (by Google) and o1-preview (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 3 benchmarks (GPQA, SimpleQA, SWE-Bench Verified), while o1-preview is better at 0 benchmarks. Gemini 3 Flash significantly outperforms across most benchmarks.
On price, Gemini 3 Flash is roughly 23.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Gemini 3 Flash also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.
Choose Gemini 3 Flash if…
- you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
- cost matters — it's about 23.3x cheaper per token
- you process long inputs — it offers a 1,000,000 token context window
- you want the most recent training data — it shipped Dec 2025
Choose o1-preview if…
- you want predictable pricing at $15.00/M input and $60.00/M output
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 3 Flash outperforms in 3 benchmarks (GPQA, SimpleQA, SWE-Bench Verified), while o1-preview is better at 0 benchmarks.
Gemini 3 Flash significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 3 Flash ($0.50/1M tokens) is 30.0x cheaper than o1-preview ($15.00/1M tokens).
For output processing, Gemini 3 Flash ($3.00/1M tokens) is 20.0x cheaper than o1-preview ($60.00/1M tokens).
In conclusion, o1-preview is more expensive than Gemini 3 Flash.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 3 Flash accepts 1,000,000 input tokens compared to o1-preview's 128,000 tokens. Gemini 3 Flash can generate longer responses up to 65,536 tokens, while o1-preview is limited to 32,768 tokens.
Input Capabilities
Supported data types and modalities
Gemini 3 Flash supports multimodal inputs, whereas o1-preview does not.
Gemini 3 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.
Gemini 3 Flash
o1-preview
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 3 Flash was released on 2025-12-17, while o1-preview was released on 2024-09-12.
Gemini 3 Flash is 15 months newer than o1-preview.
Dec 17, 2025
5 months ago
1.3yr newerSep 12, 2024
1.7 years ago
Knowledge Cutoff
When training data ends
Gemini 3 Flash has a documented knowledge cutoff of 2025-01-31, while o1-preview's cutoff date is not specified.
We can confirm Gemini 3 Flash's training data extends to 2025-01-31, but cannot make a direct comparison without o1-preview's cutoff date.
Jan 2025
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Provider Availability
Gemini 3 Flash is available from Google. o1-preview is available from OpenAI, Azure.
Gemini 3 Flash
o1-preview
Outputs Comparison
Key Takeaways
o1-preview
View detailsOpenAI
No standout differentiators in the data we have for this pair.
Detailed Comparison
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FAQ
Common questions about Gemini 3 Flash vs o1-preview.