Gemini 1.5 Flash vs o1-preview Comparison

Comparing Gemini 1.5 Flash and o1-preview across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemini 1.5 Flash outperforms in 0 benchmarks, while o1-preview is better at 4 benchmarks (GPQA, MATH, MGSM, MMLU).

o1-preview significantly outperforms across most benchmarks.

Sun Mar 22 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Flash costs less

For input processing, Gemini 1.5 Flash ($0.15/1M tokens) is 100.0x cheaper than o1-preview ($15.00/1M tokens).

For output processing, Gemini 1.5 Flash ($0.60/1M tokens) is 100.0x cheaper than o1-preview ($60.00/1M tokens).

In conclusion, o1-preview is more expensive than Gemini 1.5 Flash.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers

Sun Mar 22 2026 • llm-stats.com

Gemini 1.5 Flash

Input tokens$0.15

Output tokens$0.60

Best providerGoogle

o1-preview

Input tokens$15.00

Output tokens$60.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

Gemini 1.5 Flash accepts 1,048,576 input tokens compared to o1-preview's 128,000 tokens. o1-preview can generate longer responses up to 32,768 tokens, while Gemini 1.5 Flash is limited to 8,192 tokens.

Gemini 1.5 Flash

Input1,048,576 tokens

Output8,192 tokens

o1-preview

Input128,000 tokens

Output32,768 tokens

Sun Mar 22 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 1.5 Flash supports multimodal inputs, whereas o1-preview does not.

Gemini 1.5 Flash can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 1.5 Flash

Text

Images

Audio

Video

o1-preview

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 1.5 Flash

Proprietary

Closed source

o1-preview

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash was released on 2024-05-01, while o1-preview was released on 2024-09-12.

o1-preview is 4 months newer than Gemini 1.5 Flash.

Gemini 1.5 Flash

May 1, 2024

1.9 years ago

o1-preview

Sep 12, 2024

1.5 years ago

4mo newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash has a documented knowledge cutoff of 2023-11-01, while o1-preview's cutoff date is not specified.

We can confirm Gemini 1.5 Flash's training data extends to 2023-11-01, but cannot make a direct comparison without o1-preview's cutoff date.

Gemini 1.5 Flash

Nov 2023

o1-preview

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Provider Availability

Gemini 1.5 Flash is available from Google. o1-preview is available from OpenAI, Azure. The availability of providers can affect quality of the model and reliability.