Gemini 2.5 Flash-Lite vs Gemini 3.1 Pro Comparison
Comparing Gemini 2.5 Flash-Lite and Gemini 3.1 Pro across benchmarks, pricing, and capabilities.
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 2.5 Flash-Lite outperforms in 0 benchmarks, while Gemini 3.1 Pro is better at 3 benchmarks (GPQA, Humanity's Last Exam, SWE-Bench Verified).
Gemini 3.1 Pro significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 2.5 Flash-Lite ($0.10/1M tokens) is 25.0x cheaper than Gemini 3.1 Pro ($2.50/1M tokens).
For output processing, Gemini 2.5 Flash-Lite ($0.40/1M tokens) is 37.5x cheaper than Gemini 3.1 Pro ($15.00/1M tokens).
In conclusion, Gemini 3.1 Pro is more expensive than Gemini 2.5 Flash-Lite.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Both models have the same input context window of 1,048,576 tokens. Both models can generate responses up to 65,536 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 2.5 Flash-Lite and Gemini 3.1 Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.5 Flash-Lite
Gemini 3.1 Pro
License
Usage and distribution terms
Gemini 2.5 Flash-Lite is licensed under Creative Commons Attribution 4.0 License, while Gemini 3.1 Pro uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Creative Commons Attribution 4.0 License
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 2.5 Flash-Lite was released on 2025-06-17, while Gemini 3.1 Pro was released on 2026-02-19.
Gemini 3.1 Pro is 8 months newer than Gemini 2.5 Flash-Lite.
Jun 17, 2025
9 months ago
Feb 19, 2026
3 weeks ago
8mo newerKnowledge Cutoff
When training data ends
Gemini 2.5 Flash-Lite has a knowledge cutoff of 2025-01-01, while Gemini 3.1 Pro has a cutoff of 2025-01-31.
Gemini 3.1 Pro has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to Gemini 2.5 Flash-Lite (2025-01-01).
Jan 2025
Jan 2025
Provider Availability
Gemini 2.5 Flash-Lite is available from Google. Gemini 3.1 Pro is available from Google. The availability of providers can affect quality of the model and reliability.
Gemini 2.5 Flash-Lite
Gemini 3.1 Pro
Outputs Comparison
Key Takeaways
Detailed Comparison
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