Model Comparison

Gemini 2.5 Flash vs Gemini 3 ProWhich is better in 2026?

Gemini 3 Pro significantly outperforms across most benchmarks. Gemini 2.5 Flash is 5.3x cheaper per token.

Verdict: Gemini 2.5 Flash vs Gemini 3 Pro — which is better?

Gemini 2.5 Flash (by Google) and Gemini 3 Pro (by Google) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

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

On price, Gemini 2.5 Flash is roughly 5.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose Gemini 2.5 Flash if…

  • cost matters — it's about 5.3x cheaper per token

Choose Gemini 3 Pro if…

  • you want the strongest raw capability — it leads on 5 of 6 shared benchmarks
  • you want the most recent training data — it shipped Nov 2025

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

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

Gemini 3 Pro significantly outperforms across most benchmarks.

Sun Jul 26 2026 • llm-stats.com

Arena Performance

Human preference votes

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 6.7x cheaper than Gemini 3 Pro ($2.00/1M tokens).

For output processing, Gemini 2.5 Flash ($2.50/1M tokens) is 4.8x cheaper than Gemini 3 Pro ($12.00/1M tokens).

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

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

Lowest available price from all providers
Sun Jul 26 2026 • llm-stats.com
Google
Gemini 2.5 Flash
Input tokens$0.30
Output tokens$2.50
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. Both models can generate responses up to 65,536 tokens.

Google
Gemini 2.5 Flash
Input1,048,576 tokens
Output65,536 tokens
Google
Gemini 3 Pro
Input1,048,576 tokens
Output65,536 tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Gemini 2.5 Flash and Gemini 3 Pro 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 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 2.5 Flash

Proprietary

Closed source

Gemini 3 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Gemini 2.5 Flash was released on 2025-05-20, while Gemini 3 Pro was released on 2025-11-18.

Gemini 3 Pro is 6 months newer than Gemini 2.5 Flash.

Gemini 2.5 Flash

May 20, 2025

1.2 years ago

Gemini 3 Pro

Nov 18, 2025

8 months ago

6mo 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 Pro

Jan 2025

Provider Availability

Gemini 2.5 Flash is available from Google. Gemini 3 Pro is available from Google.

Gemini 2.5 Flash

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

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→

Key Takeaways

Google
Less expensive input tokens
Less expensive output tokens
Higher FACTS Grounding score (85.3% vs 70.5%)
Google
Higher AIME 2025 score (100.0% vs 72.0%)
Higher GPQA score (91.9% vs 82.8%)
Higher Humanity's Last Exam score (45.8% vs 11.0%)
Higher SimpleQA score (72.1% vs 26.9%)
Higher SWE-Bench Verified score (76.2% vs 60.4%)
GoogleGemini 2.5 Flash
GoogleGemini 3 Pro
Compare in Playground

Detailed Comparison

Interactive Arena

Judge for yourself.

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

Gemini 2.5 Flash
✓ Preferred
Gemini 3 Pro
Open in Playground
AI Model Comparison Table
Feature
Google
Gemini 2.5 Flash
Google
Gemini 3 Pro

FAQ

Common questions about Gemini 2.5 Flash vs Gemini 3 Pro.

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

Gemini 3 Pro significantly outperforms across most benchmarks. Gemini 2.5 Flash is made by Google and Gemini 3 Pro is made by Google. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Gemini 2.5 Flash compare to Gemini 3 Pro 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 Pro scores AIME 2025: 100.0%, Vending-Bench 2: 100.0%, Global PIQA: 93.4%, GPQA: 91.9%, MMMLU: 91.8%.

Is Gemini 2.5 Flash cheaper than Gemini 3 Pro?

Gemini 2.5 Flash is 6.7x cheaper for input tokens. Gemini 2.5 Flash costs $0.30/M input and $2.50/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 2.5 Flash and Gemini 3 Pro?

Gemini 2.5 Flash 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 2.5 Flash and Gemini 3 Pro?

Key differences include input pricing ($0.30 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

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