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Gemini 2.5 Flash vs Gemini 3 Flash

Gemini 3 Flash leads the LLM Stats Score 36.7 to 21.7. Gemini 2.5 Flash is 1.3x cheaper per token.

Google · Google · Updated for 2026

Which is better?

Gemini 3 Flash leads the overall LLM Stats Score 36.7 to 21.7, ranking #89 overall.

In the 6 individual benchmarks reported for both models, Gemini 3 Flash wins 5; this is a narrower head-to-head signal than the composite indexes.

On price, Gemini 2.5 Flash is roughly 1.3x 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 2.5 Flash

  • cost matters — it's about 1.3x cheaper per token

Choose Gemini 3 Flash

  • overall performance matters — it scores 36.7 and ranks #89 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you value its reported benchmark strengths — it wins 5 of 6 exact shared results
  • you want the most recent training data — it shipped Dec 2025

At a glance

The differences that matter most.

Gemini 2.5 Flash
Google
Gemini 3 Flash
Google
Core performance indexes
LLM Stats Score
21.7
#199
36.7
#89
Reasoning
21.4
#196
37.5
#77
Coding
8.3
#194
22.0
#93
Cost, coverage & limits
Benchmark wins
1 of 6
5 of 6
Input price
$0.30 / M
$0.50 / M
Output price
$2.50 / M
$3.00 / M
Context window
1,000,000
1,000,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

4 shared
Index
Gemini 2.5 Flash
Gemini 3 Flash
Math
16.2#215
37.0#34
Vision
10.9#124
25.4#52
Multimodal
19.5#81
26.9#47
Factuality
16.2#18
17.9#14
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

14 reported for Gemini 2.5 Flash · 24 for Gemini 3 Flash

6 shared

Gemini 2.5 Flash outperforms in 1 benchmarks (FACTS Grounding), while Gemini 3 Flash is better at 5 benchmarks (AIME 2025, GPQA, Humanity's Last Exam, SimpleQA, SWE-Bench Verified).

Gemini 3 Flash significantly outperforms across most benchmarks.

Fri Oct 16 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

Gemini 2.5 Flash costs less

For input processing, Gemini 2.5 Flash ($0.30/1M tokens) is 1.7x cheaper than Gemini 3 Flash ($0.50/1M tokens).

For output processing, Gemini 2.5 Flash ($2.50/1M tokens) is 1.2x cheaper than Gemini 3 Flash ($3.00/1M tokens).

In conclusion, Gemini 3 Flash is more expensive than Gemini 2.5 Flash.*

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

Lowest available price from all providers
Fri Oct 16 2026 • llm-stats.com
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
Best providerDeepinfra
Google
Gemini 3 Flash
Input tokens$0.50
Output tokens$3.00
Best providerGoogle
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

Both models have the same input context window of 1,000,000 tokens. Gemini 2.5 Flash can generate longer responses up to 1,000,000 tokens, while Gemini 3 Flash is limited to 65,536 tokens.

Google
Gemini 2.5 Flash
Input1,000,000 tokens
Output1,000,000 tokens
Google
Gemini 3 Flash
Input1,000,000 tokens
Output65,536 tokens
Fri Oct 16 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Gemini 2.5 Flash and Gemini 3 Flash support multimodal inputs.

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

Gemini 2.5 Flash

Text
Images
Audio
Video

Gemini 3 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 2.5 Flash

Proprietary

Closed source

Gemini 3 Flash

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while Gemini 3 Flash was released on 2025-12-17.

Gemini 3 Flash is 7 months newer than Gemini 2.5 Flash.

Gemini 2.5 Flash

May 20, 2025

1.4 years ago

Gemini 3 Flash

Dec 17, 2025

10 months ago

7mo newer

Knowledge Cutoff

When training data ends

Both models have the same knowledge cutoff date of 2025-01-31.

They should have similar awareness of historical events and information up to this date.

Gemini 2.5 Flash

Jan 2025

Gemini 3 Flash

Jan 2025

Provider Availability

Gemini 2.5 Flash is available from DeepInfra, Google. Gemini 3 Flash is available from Google.

Gemini 2.5 Flash

deepinfra logo
Deepinfra
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M
google logo
Google
Input Price:Input: $0.30/1MOutput Price:Output: $2.50/1M

Gemini 3 Flash

google logo
Google
Input Price:Input: $0.50/1MOutput Price:Output: $3.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Gemini 2.5 Flash and Gemini 3 Flash side-by-side, then vote on the output you prefer.

Gemini 2.5 Flash
✓ Preferred
Gemini 3 Flash
Open in Playground

FAQ

Common questions about Gemini 2.5 Flash vs Gemini 3 Flash.

Which is better, Gemini 2.5 Flash or Gemini 3 Flash?

Gemini 3 Flash leads the LLM Stats Score 36.7 to 21.7. Gemini 2.5 Flash is made by Google and Gemini 3 Flash 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 2.5 Flash compare to Gemini 3 Flash in benchmarks?

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 3 Flash scores Vending-Bench 2: 100.0%, AIME 2025: 99.7%, Global PIQA: 92.8%, MMMLU: 91.8%, GPQA: 90.4%.

Is Gemini 2.5 Flash cheaper than Gemini 3 Flash?

Gemini 2.5 Flash is 1.7x cheaper for input tokens. Gemini 2.5 Flash costs $0.30/M input and $2.50/M output via deepinfra. Gemini 3 Flash costs $0.50/M input and $3.00/M output via google.

What are the context window sizes for Gemini 2.5 Flash and Gemini 3 Flash?

Gemini 2.5 Flash supports 1.0M tokens and Gemini 3 Flash 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 2.5 Flash and Gemini 3 Flash?

Key differences include LLM Stats Score (21.7 vs 36.7), input pricing ($0.30 vs $0.50/M). See the full comparison above for benchmark-by-benchmark results.

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