Gemini 1.5 Flash vs o3-mini Comparison

Comparing Gemini 1.5 Flash and o3-mini 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 o3-mini is better at 4 benchmarks (GPQA, MATH, MGSM, MMLU).

o3-mini significantly outperforms across most benchmarks.

Fri Mar 20 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 7.3x cheaper than o3-mini ($1.10/1M tokens).

For output processing, Gemini 1.5 Flash ($0.60/1M tokens) is 7.3x cheaper than o3-mini ($4.40/1M tokens).

In conclusion, o3-mini is more expensive than Gemini 1.5 Flash.*

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

Lowest available price from all providers

Fri Mar 20 2026 • llm-stats.com

Gemini 1.5 Flash

Input tokens$0.15

Output tokens$0.60

Best providerGoogle

o3-mini

Input tokens$1.10

Output tokens$4.40

Best providerAzure

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Context Window

Maximum input and output token capacity

Gemini 1.5 Flash accepts 1,048,576 input tokens compared to o3-mini's 200,000 tokens. o3-mini can generate longer responses up to 100,000 tokens, while Gemini 1.5 Flash is limited to 8,192 tokens.

Gemini 1.5 Flash

Input1,048,576 tokens

Output8,192 tokens

o3-mini

Input200,000 tokens

Output100,000 tokens

Fri Mar 20 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 1.5 Flash supports multimodal inputs, whereas o3-mini 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

o3-mini

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

o3-mini

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash was released on 2024-05-01, while o3-mini was released on 2025-01-30.

o3-mini is 9 months newer than Gemini 1.5 Flash.

Gemini 1.5 Flash

May 1, 2024

1.9 years ago

o3-mini

Jan 30, 2025

1.1 years ago

9mo newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash has a knowledge cutoff of 2023-11-01, while o3-mini has a cutoff of 2023-09-30.

Gemini 1.5 Flash has more recent training data (up to 2023-11-01), making it potentially better informed about events through that date compared to o3-mini (2023-09-30).

Gemini 1.5 Flash

Nov 2023

2 mo newer

o3-mini

Sep 2023

Provider Availability

Gemini 1.5 Flash is available from Google. o3-mini is available from Azure, OpenAI. The availability of providers can affect quality of the model and reliability.