Model Comparison

Gemini 1.5 Pro vs Gemini 2.5 Flash-Lite

Gemini 2.5 Flash-Lite shows notably better performance in the majority of benchmarks. Gemini 2.5 Flash-Lite is 25.0x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 1.5 Pro outperforms in 1 benchmarks (Vibe-Eval), while Gemini 2.5 Flash-Lite is better at 2 benchmarks (GPQA, MMMU).

Gemini 2.5 Flash-Lite shows notably better performance in the majority of benchmarks.

Sat May 02 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash-Lite costs less

For input processing, Gemini 1.5 Pro ($2.50/1M tokens) is 25.0x more expensive than Gemini 2.5 Flash-Lite ($0.10/1M tokens).

For output processing, Gemini 1.5 Pro ($10.00/1M tokens) is 25.0x more expensive than Gemini 2.5 Flash-Lite ($0.40/1M tokens).

In conclusion, Gemini 1.5 Pro is more expensive than Gemini 2.5 Flash-Lite.*

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

Lowest available price from all providers
Sat May 02 2026 • llm-stats.com
Google
Gemini 1.5 Pro
Input tokens$2.50
Output tokens$10.00
Best providerGoogle
Google
Gemini 2.5 Flash-Lite
Input tokens$0.10
Output tokens$0.40
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Gemini 1.5 Pro accepts 2,097,152 input tokens compared to Gemini 2.5 Flash-Lite's 1,048,576 tokens. Gemini 2.5 Flash-Lite can generate longer responses up to 65,536 tokens, while Gemini 1.5 Pro is limited to 8,192 tokens.

Google
Gemini 1.5 Pro
Input2,097,152 tokens
Output8,192 tokens
Google
Gemini 2.5 Flash-Lite
Input1,048,576 tokens
Output65,536 tokens
Sat May 02 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 1.5 Pro and Gemini 2.5 Flash-Lite support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Gemini 1.5 Pro

Text
Images
Audio
Video

Gemini 2.5 Flash-Lite

Text
Images
Audio
Video

License

Usage and distribution terms

Gemini 1.5 Pro is licensed under a proprietary license, while Gemini 2.5 Flash-Lite uses Creative Commons Attribution 4.0 License.

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

Gemini 1.5 Pro

Proprietary

Closed source

Gemini 2.5 Flash-Lite

Creative Commons Attribution 4.0 License

Open weights

Release Timeline

When each model was launched

Gemini 1.5 Pro was released on 2024-05-01, while Gemini 2.5 Flash-Lite was released on 2025-06-17.

Gemini 2.5 Flash-Lite is 14 months newer than Gemini 1.5 Pro.

Gemini 1.5 Pro

May 1, 2024

2.0 years ago

Gemini 2.5 Flash-Lite

Jun 17, 2025

10 months ago

1.1yr newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Pro has a knowledge cutoff of 2023-11-01, while Gemini 2.5 Flash-Lite has a cutoff of 2025-01-01.

Gemini 2.5 Flash-Lite has more recent training data (up to 2025-01-01), making it potentially better informed about events through that date compared to Gemini 1.5 Pro (2023-11-01).

Gemini 1.5 Pro

Nov 2023

Gemini 2.5 Flash-Lite

Jan 2025

1.2 yr newer

Provider Availability

Gemini 1.5 Pro is available from Google. Gemini 2.5 Flash-Lite is available from Google.

Gemini 1.5 Pro

google logo
Google
Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M

Gemini 2.5 Flash-Lite

google logo
Google
Input Price:Input: $0.10/1MOutput Price:Output: $0.40/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Larger context window (2,097,152 tokens)
Higher Vibe-Eval score (53.9% vs 51.3%)
Google
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher GPQA score (64.6% vs 59.1%)
Higher MMMU score (72.9% vs 65.9%)

Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 1.5 Pro
Google
Gemini 2.5 Flash-Lite

FAQ

Common questions about Gemini 1.5 Pro vs Gemini 2.5 Flash-Lite.

Which is better, Gemini 1.5 Pro or Gemini 2.5 Flash-Lite?

Gemini 2.5 Flash-Lite shows notably better performance in the majority of benchmarks. Gemini 1.5 Pro is made by Google and Gemini 2.5 Flash-Lite is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 1.5 Pro compare to Gemini 2.5 Flash-Lite in benchmarks?

Gemini 1.5 Pro scores XSTest: 98.8%, HellaSwag: 93.3%, GSM8k: 90.8%, BIG-Bench Hard: 89.2%, MGSM: 87.5%. Gemini 2.5 Flash-Lite scores FACTS Grounding: 84.1%, Global-MMLU-Lite: 81.1%, MMMU: 72.9%, GPQA: 64.6%, Vibe-Eval: 51.3%.

Is Gemini 1.5 Pro cheaper than Gemini 2.5 Flash-Lite?

Gemini 2.5 Flash-Lite is 25.0x cheaper for input tokens. Gemini 1.5 Pro costs $2.50/M input and $10.00/M output via google. Gemini 2.5 Flash-Lite costs $0.10/M input and $0.40/M output via google.

What are the context window sizes for Gemini 1.5 Pro and Gemini 2.5 Flash-Lite?

Gemini 1.5 Pro supports 2.1M tokens and Gemini 2.5 Flash-Lite supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Gemini 1.5 Pro and Gemini 2.5 Flash-Lite?

Key differences include context window (2.1M vs 1.0M), input pricing ($2.50 vs $0.10/M), licensing (Proprietary vs Creative Commons Attribution 4.0 License). See the full comparison above for benchmark-by-benchmark results.