Gemini 1.5 Flash 8B vs Gemini 2.5 Pro Preview 06-05 Comparison

Comparing Gemini 1.5 Flash 8B and Gemini 2.5 Pro Preview 06-05 across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Gemini 1.5 Flash 8B outperforms in 0 benchmarks, while Gemini 2.5 Pro Preview 06-05 is better at 3 benchmarks (GPQA, MMMU, Vibe-Eval).

Gemini 2.5 Pro Preview 06-05 significantly outperforms across most benchmarks.

Tue Mar 17 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 17.9x cheaper than Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens).

For output processing, Gemini 1.5 Flash 8B ($0.30/1M tokens) is 33.3x cheaper than Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens).

In conclusion, Gemini 2.5 Pro Preview 06-05 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

Tue Mar 17 2026 • llm-stats.com

Gemini 1.5 Flash 8B

Input tokens$0.07

Output tokens$0.30

Best providerGoogle

Gemini 2.5 Pro Preview 06-05

Input tokens$1.25

Output tokens$10.00

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 Pro Preview 06-05 can generate longer responses up to 65,535 tokens, while Gemini 1.5 Flash 8B is limited to 8,192 tokens.

Gemini 1.5 Flash 8B

Input1,048,576 tokens

Output8,192 tokens

Gemini 2.5 Pro Preview 06-05

Input1,048,576 tokens

Output65,535 tokens

Tue Mar 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 1.5 Flash 8B and Gemini 2.5 Pro Preview 06-05 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 Pro Preview 06-05

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 Pro Preview 06-05

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 Pro Preview 06-05 was released on 2025-06-05.

Gemini 2.5 Pro Preview 06-05 is 15 months newer than Gemini 1.5 Flash 8B.

Gemini 1.5 Flash 8B

Mar 15, 2024

2.0 years ago

Gemini 2.5 Pro Preview 06-05

Jun 5, 2025

9 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 Pro Preview 06-05 has a cutoff of 2025-01-31.

Gemini 2.5 Pro Preview 06-05 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 Pro Preview 06-05

Jan 2025

3 mo newer

Provider Availability

Gemini 1.5 Flash 8B is available from Google. Gemini 2.5 Pro Preview 06-05 is available from Google. The availability of providers can affect quality of the model and reliability.