Model Comparison

Gemini 1.5 Flash 8B vs Gemini 2.5 Flash

Gemini 2.5 Flash shows notably better performance in the majority of benchmarks. Gemini 1.5 Flash 8B is 6.7x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

4 benchmarks

Gemini 1.5 Flash 8B outperforms in 1 benchmarks (MRCR), while Gemini 2.5 Flash is better at 3 benchmarks (GPQA, MMMU, Vibe-Eval).

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

Sat Apr 11 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Gemini 1.5 Flash 8B costs less

For input processing, Gemini 1.5 Flash 8B ($0.07/1M tokens) is 4.3x cheaper than Gemini 2.5 Flash ($0.30/1M tokens).

For output processing, Gemini 1.5 Flash 8B ($0.30/1M tokens) is 8.3x cheaper than Gemini 2.5 Flash ($2.50/1M tokens).

In conclusion, Gemini 2.5 Flash is more expensive than Gemini 1.5 Flash 8B.*

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

Lowest available price from all providers
Sat Apr 11 2026 • llm-stats.com
Google
Gemini 1.5 Flash 8B
Input tokens$0.07
Output tokens$0.30
Best providerGoogle
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerGoogle
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Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,048,576 tokens. Gemini 2.5 Flash can generate longer responses up to 65,536 tokens, while Gemini 1.5 Flash 8B is limited to 8,192 tokens.

Google
Gemini 1.5 Flash 8B
Input1,048,576 tokens
Output8,192 tokens
Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
Sat Apr 11 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 1.5 Flash 8B and Gemini 2.5 Flash support multimodal inputs.

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

Gemini 1.5 Flash 8B

Text
Images
Audio
Video

Gemini 2.5 Flash

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 8B

Proprietary

Closed source

Gemini 2.5 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash 8B was released on 2024-03-15, while Gemini 2.5 Flash was released on 2025-05-20.

Gemini 2.5 Flash is 14 months newer than Gemini 1.5 Flash 8B.

Gemini 1.5 Flash 8B

Mar 15, 2024

2.1 years ago

Gemini 2.5 Flash

May 20, 2025

10 months ago

1.2yr newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash 8B has a knowledge cutoff of 2024-10-01, while Gemini 2.5 Flash has a cutoff of 2025-01-31.

Gemini 2.5 Flash has more recent training data (up to 2025-01-31), making it potentially better informed about events through that date compared to Gemini 1.5 Flash 8B (2024-10-01).

Gemini 1.5 Flash 8B

Oct 2024

Gemini 2.5 Flash

Jan 2025

3 mo newer

Provider Availability

Gemini 1.5 Flash 8B is available from Google. Gemini 2.5 Flash is available from Google.

Gemini 1.5 Flash 8B

google logo
Google
Input Price:Input: $0.07/1MOutput Price:Output: $0.30/1M

Gemini 2.5 Flash

google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Google
Less expensive input tokens
Less expensive output tokens
Higher MRCR score (54.7% vs 32.0%)
Google
Higher GPQA score (82.8% vs 38.4%)
Higher MMMU score (79.7% vs 53.7%)
Higher Vibe-Eval score (65.4% vs 40.9%)
GoogleGemini 1.5 Flash 8B
GoogleGemini 2.5 Flash
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Detailed Comparison

AI Model Comparison Table
Feature
Google
Gemini 1.5 Flash 8B
Google
Gemini 2.5 Flash

FAQ

Common questions about Gemini 1.5 Flash 8B vs Gemini 2.5 Flash

Gemini 2.5 Flash shows notably better performance in the majority of benchmarks. Gemini 1.5 Flash 8B is made by Google and Gemini 2.5 Flash is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
Gemini 1.5 Flash 8B scores XSTest: 92.6%, FLEURS: 86.4%, Natural2Code: 75.5%, WMT23: 72.6%, Video-MME: 66.2%. Gemini 2.5 Flash scores Global-MMLU-Lite: 88.4%, AIME 2024: 88.0%, FACTS Grounding: 85.3%, GPQA: 82.8%, MMMU: 79.7%.
Gemini 1.5 Flash 8B is 4.3x cheaper for input tokens. Gemini 1.5 Flash 8B costs $0.07/M input and $0.30/M output via google. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via google.
Gemini 1.5 Flash 8B supports 1.0M tokens and Gemini 2.5 Flash supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include input pricing ($0.07 vs $0.30/M). See the full comparison above for benchmark-by-benchmark results.