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Gemini 1.5 Flash 8B vs Gemini 3 Pro

Gemini 3 Pro leads the LLM Stats Score 38.4 to -0.6. Gemini 1.5 Flash 8B is 35.3x cheaper per token.

Google · Google · Updated for 2026

Which is better?

Gemini 3 Pro leads the overall LLM Stats Score 38.4 to -0.6, ranking #62 overall.

In the 1 individual benchmarks reported for both models, Gemini 3 Pro wins 1; this is a narrower head-to-head signal than the composite indexes.

On price, Gemini 1.5 Flash 8B is roughly 35.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Gemini 1.5 Flash 8B

  • cost matters — it's about 35.3x cheaper per token

Choose Gemini 3 Pro

  • overall performance matters — it scores 38.4 and ranks #62 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Nov 2025

At a glance

The differences that matter most.

Gemini 1.5 Flash 8B
Google
Gemini 3 Pro
Google
Core performance indexes
LLM Stats Score
-0.6
#319
38.4
#62
Reasoning
-0.3
#308
38.5
#58
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
$0.07 / M
$2.00 / M
Output price
$0.30 / M
$12.00 / M
Context window
1,048,576
1,048,576

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
Gemini 1.5 Flash 8B
Gemini 3 Pro
Math
2.7#284
37.0#32
Vision
-2.1#186
25.7#40
Multimodal
0.7#148
27.2#36
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

13 reported for Gemini 1.5 Flash 8B · 21 for Gemini 3 Pro

1 shared

Gemini 1.5 Flash 8B outperforms in 0 benchmarks, while Gemini 3 Pro is better at 1 benchmark (GPQA).

Gemini 3 Pro significantly outperforms across most benchmarks.

Sat Sep 05 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

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 28.6x cheaper than Gemini 3 Pro ($2.00/1M tokens).

For output processing, Gemini 1.5 Flash 8B ($0.30/1M tokens) is 40.0x cheaper than Gemini 3 Pro ($12.00/1M tokens).

In conclusion, Gemini 3 Pro 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 Sep 05 2026 • llm-stats.com
Google
Gemini 1.5 Flash 8B
Input tokens$0.07
Output tokens$0.30
Best providerGoogle
Google
Gemini 3 Pro
Input tokens$2.00
Output tokens$12.00
Best providerGoogle
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,048,576 tokens. Gemini 3 Pro 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 3 Pro
Input1,048,576 tokens
Output65,536 tokens
Sat Sep 05 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 1.5 Flash 8B and Gemini 3 Pro 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 3 Pro

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 3 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 1.5 Flash 8B was released on 2024-03-15, while Gemini 3 Pro was released on 2025-11-18.

Gemini 3 Pro is 20 months newer than Gemini 1.5 Flash 8B.

Gemini 1.5 Flash 8B

Mar 15, 2024

2.5 years ago

Gemini 3 Pro

Nov 18, 2025

9 months ago

1.7yr newer

Knowledge Cutoff

When training data ends

Gemini 1.5 Flash 8B has a knowledge cutoff of 2024-10-01, while Gemini 3 Pro has a cutoff of 2025-01-31.

Gemini 3 Pro 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 3 Pro

Jan 2025

3 mo newer

Provider Availability

Gemini 1.5 Flash 8B is available from Google. Gemini 3 Pro is available from Google.

Gemini 1.5 Flash 8B

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

Gemini 3 Pro

google logo
Google
Input Price:Input: $2.00/1MOutput Price:Output: $12.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

Run your own prompts against Gemini 1.5 Flash 8B and Gemini 3 Pro side-by-side, then vote on the output you prefer.

Gemini 1.5 Flash 8B
✓ Preferred
Gemini 3 Pro
Open in Playground

FAQ

Common questions about Gemini 1.5 Flash 8B vs Gemini 3 Pro.

Which is better, Gemini 1.5 Flash 8B or Gemini 3 Pro?

Gemini 3 Pro leads the LLM Stats Score 38.4 to -0.6. Gemini 1.5 Flash 8B is made by Google and Gemini 3 Pro is made by Google. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Gemini 1.5 Flash 8B compare to Gemini 3 Pro in benchmarks?

Gemini 1.5 Flash 8B scores XSTest: 92.6%, FLEURS: 86.4%, Natural2Code: 75.5%, WMT23: 72.6%, Video-MME: 66.2%. Gemini 3 Pro scores AIME 2025: 100.0%, Vending-Bench 2: 100.0%, Global PIQA: 93.4%, GPQA: 91.9%, MMMLU: 91.8%.

Is Gemini 1.5 Flash 8B cheaper than Gemini 3 Pro?

Gemini 1.5 Flash 8B is 28.6x cheaper for input tokens. Gemini 1.5 Flash 8B costs $0.07/M input and $0.30/M output via google. Gemini 3 Pro costs $2.00/M input and $12.00/M output via google.

What are the context window sizes for Gemini 1.5 Flash 8B and Gemini 3 Pro?

Gemini 1.5 Flash 8B supports 1.0M tokens and Gemini 3 Pro 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 Flash 8B and Gemini 3 Pro?

Key differences include LLM Stats Score (-0.6 vs 38.4), input pricing ($0.07 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

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