Gemini 3 Pro vs Step-3.5-Flash Comparison

Comparing Gemini 3 Pro and Step-3.5-Flash across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 3 Pro outperforms in 3 benchmarks (AIME 2025, SWE-Bench Verified, Terminal-Bench 2.0), while Step-3.5-Flash is better at 0 benchmarks.

Gemini 3 Pro significantly outperforms across most benchmarks.

Tue Mar 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Step-3.5-Flash costs less

For input processing, Gemini 3 Pro ($2.00/1M tokens) is 20.0x more expensive than Step-3.5-Flash ($0.10/1M tokens).

For output processing, Gemini 3 Pro ($12.00/1M tokens) is 30.0x more expensive than Step-3.5-Flash ($0.40/1M tokens).

In conclusion, Gemini 3 Pro is more expensive than Step-3.5-Flash.*

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

Lowest available price from all providers

Tue Mar 17 2026 • llm-stats.com

Gemini 3 Pro

Input tokens$2.00

Output tokens$12.00

Best providerGoogle

Step-3.5-Flash

Input tokens$0.10

Output tokens$0.40

Best providerStepFun

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Context Window

Maximum input and output token capacity

Gemini 3 Pro accepts 1,048,576 input tokens compared to Step-3.5-Flash's 65,536 tokens. Gemini 3 Pro can generate longer responses up to 65,536 tokens, while Step-3.5-Flash is limited to 8,192 tokens.

Gemini 3 Pro

Input1,048,576 tokens

Output65,536 tokens

Step-3.5-Flash

Input65,536 tokens

Output8,192 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Gemini 3 Pro supports multimodal inputs, whereas Step-3.5-Flash does not.

Gemini 3 Pro can handle both text and other forms of data like images, making it suitable for multimodal applications.

Gemini 3 Pro

Text

Images

Audio

Video

Step-3.5-Flash

Text

Images

Audio

Video

License

Usage and distribution terms

Gemini 3 Pro is licensed under a proprietary license, while Step-3.5-Flash uses Apache 2.0.

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

Gemini 3 Pro

Proprietary

Closed source

Step-3.5-Flash

Apache 2.0

Open weights

Release Timeline

When each model was launched

Gemini 3 Pro was released on 2025-11-18, while Step-3.5-Flash was released on 2026-02-02.

Step-3.5-Flash is 3 months newer than Gemini 3 Pro.

Gemini 3 Pro

Nov 18, 2025

3 months ago

Step-3.5-Flash

Feb 2, 2026

1 months ago

2mo newer

Knowledge Cutoff

When training data ends

Gemini 3 Pro has a documented knowledge cutoff of 2025-01-31, while Step-3.5-Flash's cutoff date is not specified.

We can confirm Gemini 3 Pro's training data extends to 2025-01-31, but cannot make a direct comparison without Step-3.5-Flash's cutoff date.

Gemini 3 Pro

Jan 2025

Step-3.5-Flash

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Provider Availability

Gemini 3 Pro is available from Google. Step-3.5-Flash is available from StepFun. The availability of providers can affect quality of the model and reliability.